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Solides d’Archimède 2014-04-29

Clémentine pose la question :
Pourquoi une pyramide a base carrée n'est elle pas un polyèdre archimedien ? J'ai pourtant essayé d'en construire un avec tout ses cotés égaux et ça fonctionne ! Aidez moi je n'en dors plus la nuit ? :S
Chris Fisher lui répond.

deux wagons 2013-04-05

Cyril pose la question :
Bonjour,
je suis confronté à un problème dont je n'arrive pas à trouver la solution. Le voici: "Deux wagons de masses 30 tonnes et 60 tonnes entrent en collision sur une voie ferrée droite horizontale, ne déraillent pas et restent collés ensemble après le choc. Juste après la collision, ils roulent ensemble à 10 km/h vers le nord. Sachant que le wagon léger roulait à 20km/h vers le nord avant la collision, la vitesse du wagon lourd avant la collision = ?"

Je pense qu'il faut employer la formule de la quantité de mouvement "p=mv" mais je ne sais pas comment m'y prendre...

Merci d'avance pour votre aide!
Cyril Biselx
Claude Tardif lui répond.

calcul de durée 2012-09-03

laila pose la question :
un bus démarre de paris à 8h 45mn s'il fait 42h 20 mn de trajet entre paris et la ville suivante à quelle heure il arrivera à la ville suivante. est ce qu'il ya un shema pour calculer ou comment procéder. je sais qu'il faut additionner 8h 45 mn à 42h 20mn, mais comment on trouve le résultat rapidement. merci
Claude Tardif lui répond.

Les dérivées partielles 2012-05-16

Haddouche pose la question :
Bonjour,
Je vous demande de bien vouloir m'éclaircir comment on calcule les dérivées partielles généralement étudiées dans les modèles de la concurrence fiscale à titre d'exemple celui de Wildasin ""NASH EQUILIBRIA IN MODELS OF TAX COMPETITION "", dont j'ai essayé toutes les méthodes et aucune d'elle n'est arrivée à trouver le résultat des dérivées de ce dérnier papier, à cet effet, je vous serais reconnaissant de m'éclaicir la méthode afin de résoudre ce problème qui pour moi un vrai mistère à percer. Je vous remercie infiniment à l'avance. Et comptant sur votre compréhension, mes salutations les meilleures. HA
Claude Tardif lui répond.

Combien de bonds aura-t-il besoin 2012-04-10

zachary pose la question :
Un lapin fait toujours un bond de 3m suivi d'un bond de 5m. S'il maintient ce rythme de combien de bonds aura-t-il besoin pour franchir une distance de 584m ??
Claude Tardif lui répond.

un triangle 2011-11-07

Haelita pose la question :
La corde élastique a une longueur de 60cm au repos . Quelle est la nouvelle longueur de la corde si on l'écarte de 11 cm en la tirant par son milieu ?
Claude Tardif lui répond.

Les calcules avec les heures 2011-09-09

johanna pose la question :
bonjour je voudrais pouvoir expliquer a mon fils ces calcules avec les heures, mais franchement je n'y comprend rien, pouvez vous m'aider.
voilà le premier calcul:
1h35min29s - 46min37s

deuxiéme exercice:
calculer la durée d'une emission télévisé qui débute à 20h40min et se termine à 22h17min.
troisiéme exercie:
je suis partie en vacances le 25 juillet. Mes vacances ont durées 2 semaines. Quel jours suis-je revenu?
quatroéme exercice:
je pars de st-pierre, je prend le bus. je veut arrivé à st-denis à 10h et demi. je sais que la durée du trajet st-pierre /st-denis est de 1h50min. a quel heure dois-je partir de st-pierre.
Claude Tardif lui répond.

Une sortie 2011-08-26

SANGES pose la question :
un groupe d'amis souhaite organiser une sortie. si chacun donnait 14 euros, il manquerait 4 euro. Mais si chacun donnait 16 euros, il y aurait un excédent de 6 euro. combien y a-t-il d'amis dans le groupe ?
Claude Tardif lui répond.

La conjecture de Goldbach 2011-02-18

ahmedbenmoussa pose la question :
montrez que tout nombre entier paire supérieur à 4 s'écrit somme de deux nombres premiers
Claude Tardif lui répond.

une écriture plus simple des expressions 2011-01-13

jessie pose la question :
trouver une écriture plus simple des expressions suivantes sachant que : x + y = 3 et x - y =-2
A=x-1+y+2 B=x-1+y-2
C=x+1+y+2 C=x+1+y-2

Claude Tardif lui répond.

(5+3)/2-3= 2010-12-10

chantal pose la question :
(5+3)/2-3=
Claude Tardif lui répond.

Terminologie mathematique 2010-10-31

Adil pose la question :
Bonjour ,

Pourriez-vous m'indiquer les titre et auteur d'un bon dictionnaire francais anglais de terminologie mathematique ? Auriez-vous egalement l'adresse d'un site web traduisant du francais a l'anglais les termes ert expressions mathematiques ?

Merci par avance,
Adil
Pierre-Louis Gagnon lui répond.

Un polynome de degré 3 2010-10-09

ait pose la question :
comment determiner n polynome P de degré 3 verifiant pour tout reel x la relation p(x+1)-p(x)=x²
Claude Tardif lui répond.

Quel est le 6e nombre dans la serie suivante 2010-08-13

jeff pose la question :
Quel est le 6e nombre dans la serie suivante: 1,2,6,42,1806,...
Stephen La Rocque and Claude Tardif lui répond.

une suite 2010-07-01

djodilune pose la question :
Salut tout le monde ! J'ai un probleme de math dans un concours de Medecine , Le voilà :

n £ N* on a : S = 1/[n(n+1)] + 1/[(n+1)(n+2)] + ... + 1/([2n(2n+1)] .

reponse a : S= 1 - 1/n
Reponse b : S= 1 - 1/(2n)
Reponse C : S= 1 - 1/(n+1)
Reponse D : S= (1/n) - (1/2n )
Reponse E : S= (1/n) - [1/(2n-1)].
Si vous pouvez me donner le reponse avec justification pour comprendre bien. Merci d'avance
Claude Tardif lui répond.

Mathilde aime la musique et les mathématique. 2010-04-19

Lucas pose la question :
j'ai un problème pouvait vous m'aider a le résoudre:Mathilde aime la musique et les mathématique.Quand on lui demande combien de CD elle a elle répond "Je ne les ai pas comptés.quand je les groupe 5 par 5 ,il ne m'en reste pas.quand je les groupe 2 par2,il m'en reste 1.quand je les range 6 par 6,il m'en reste 5.je suis surque j'en moins que cinquante." Peux-tu trouver le nombre de CD de Mathilde? aider moi svp ps:je suis en 6ème donc faut pas que se soit trop compliqué
Claude Tardif lui répond.

l'orientation d'un plan dans l'espace 2010-03-22

gianno pose la question :
comment calculer l'orientation d'un plan dans l'espace
Claude Tardif lui répond.

Division 2010-03-10

lucas pose la question :
bonjour je suis eleve de 6 eme je bloque sur ce petit probleme

Nat a fait une division,elle ecrit 4568=23*198,608+reste que vaut ce reste?

merci d'avance
lucas
Claude Tardif lui répond.

Résolution d'une équation 2010-02-25

sellin pose la question :
Il faut que j'exprime x en fonction de m dans l'équation suivante et je n'y arrive pas: -3x + 1 = (m-1) / 2 * x + (2m + 3) / 5
Claude Tardif lui répond.

Léo a programmé sa tortue 2010-02-15

Lucas pose la question :
pouvez vous m'aidez a résoudre le problème géométrie suivant: Léo a programmé sa tortue en lui donnant les ordres suivant:execute 5 fois les instructions suivante: avance de 4 cm puis tourne a 72° a droite.Dessine le parcour de la tortue. La tortue est partie d'un point A , que lui dire pour qu'elle revinne a son point de départ?

Merci d'avance
Lucas
Claude Tardif lui répond.

Deux nombres consécutifs 2010-01-18

Janot pose la question :
Bonjour comment peut on faire pour démontrer que si deux nombres sont consécutifs, leur produit et leur somme sont premiers entre eux Merci de me mettre sur la voie , j'ai échoué avec Bezout.
Claude Tardif lui répond.

Volume d'une sphere entre 4 autres spheres 2010-01-18

Bonfils pose la question :
Bonjour,

Je souhaiterais en fait calculer le rayon de la sphère max qui pourrait s'insérer entre 4 sphères de rayon connu. Merci par avance pour votre réponse. Sincères salutations
Chris Fisher lui répond.

soustraction 2010-01-14

LUCAS pose la question :
comment faire l'operation suivant car je ne me souvient plus tres bien
D'avance merci
4h44mn53s-2h52mn45s
Pierre-Louis Gagnon et Claude Tardif lui répond.

L'aire d'un hexagon, octagon etc 2010-01-07

danie pose la question :
C'est quoi la formule pour l'aire d'un hexagon, octagon etc. est-ce que c'est Nombre de cotes x ((L'apothem x la mesure d'un cote tout divise par 2)???
Claude Tardif lui répond.

triacontaèdre rhombique 2009-12-22

Paul pose la question :
Je voudrais savoir si les quatre polyèdres suivants sont le même: P1:c'est le polyèdre convexe de centre O dont les sommets (62)sont les projetés (sur la sphère de centre O et de rayon 1,i.e U), des sommets(12), des milieux des arêtes(30),et des centres des faces(20) de l'icosaèdre de Platon (de centre O);

P2::c'est le polyèdre convexe de centre O dont les sommets (62)sont les projetés (sur la sphère de centre O et de rayon 1,i.e U), des sommets(20), des milieux des arêtes(30),et des centres des faces(12) du dodécaèdre de Platon (de centre O);

P3:c'est le polyèdre convexe de centre O dont les sommets (62)sont les projetés sur U des sommets du disdyakis-triacontaèdre (dual polaire du grand rhombicosidodécaèdre)(de centre O);

P4:c'est le polyèdre convexe de centre O dont les sommets (62)sont les projetés sur U des sommets (32) et des centres des faces (30) du triacontaèdre rhombique (dual polaire de l'icosidodécaèdre) (de centre O).

Merci pour la réponse, et bonnes fêtes.
Paul
Robert Dawson and Chris Fisher lui répond.

Les polyèdres 2009-11-12

Paul pose la question :
Parmi tous les polyèdres dont les sommets sont sur une sphère et dont les faces sont isométriques (pas nécessairement régulières, ni nécessairement triangulaires),
"(2,3,5)" (voir définition ci-après) est-il celui qui présente le plus grand rapport entre les rayons des sphères inscrite et circonscrite?

"(2,3,5)" désigne le polyèdre (de centre O) dont les faces sont des triangles isométriques tel que: si ABC est une face, les mesures des dièdres d'arêtes OA, OB, OC sont pi/2, pi/3 et pi/5.
Merci pour ce site.
Paul
Robert Dawson and Claude Tardif lui répond.

Le plus grand commun diviseur 2009-11-11

Katie pose la question :
Question: Pendant mon cours de MAT 1300, mon enseignant m'a posé la question suivante:

(a, b) = 12
(a², b) = 24
(b, 72) = ?

Pouvez-vous m'aider s'il-vous-plaît?
Claude Tardif lui répond.

Une piscine 2009-11-04

kemayou pose la question :
Dans un de ces problèmes,ma fille se trouve face à cette question,et je ne parviens pas à l'aider,pourriez-vous nous donner un petit coup de pouce? Voici l'énoncé:Un jardin a 22m de long et 8m de large.Au centre du jardin,on a fait construire une piscine dont le périmètre est de 44m.La surface restante est couverte de gazon. La question est :exprimer en fonction de x la longueur de cette piscine. Dans l'attente de votre réponse,recevez nos salutations distinguées. Merci.Mme kemayou
Claude Tardif lui répond.

Le volume d'une boule 2009-10-22

ve.lu.ch pose la question :
Pour calculer le volume d'une boule, il faut utiliser la formule :

4/3 x Pi x R au cube

Pourquoi 4/3 ?

Merci d'avance
Pierre-Louis Gagnon et Claude Tardif lui répond.

Un triangle isocèle 2009-10-08

lauwick pose la question :
ABC un triangle isocèle en A de périmètre 16 cm. De plus son aire est égale au quart de l'aire du carré construit sur sa base bc. Quelles sont les longueurs des cotés de ce trangle? Merci
Claude Tardif lui répond.

Polyèdres 2009-10-07

DEPASSE pose la question :
Si un polyèdre est inscriptible et circonscriptible, et si ses faces sont isométriques(non nécessairement polygones réguliers) , le dièdre entre deux quelconques de ses faces adjacentes est il toujours le même ? Si non, un exemple?
Claude Tardif lui répond.

Trigonometrie 2009-08-07

Michaël pose la question :
Bonjour,
Je cherche a vérifié cette relation de trigo, Tan^2x = Sin^2x +Sin^2x*Tan^2x.

après de nombreux essais, j'arrive à ce résultat: Tan^2= 1-cos^2x + 1-cos^2x*(sin^2x/cos^2x) Merci de votre aide
Claude Tardif lui répond.

Le réservoir 2009-04-09

Myrianne pose la question :
Le réservoir d'essence d'une petite voiture peut contenir 50 litres. En sachant que 1 dm3 équivaut à litre, donne les dimensions de deux prismes différents représentant ce réservoir.
Claude Tardif lui répond.

Preuve du volume d'une boule 2009-04-06

Geneviève pose la question :
J'aimerais avoir l'explication du volume de la boule, qui est (4pi R au cube) divisé par 3. J'aimerais savoir le pourquoi de l'équation, la preuve de celle-ci. Merci!
Pierre-Louis Gagnon lui répond.

Une multiplication 2009-04-03

josee pose la question :
24/6x5+40-10=

le x est une multiplication et il n'y as pas de parenthèses.

Merci Josée
Antoine Letarte and Claude Tardif lui répond.

Algebre 2009-03-04

Jonnathan pose la question :
Pour entrer sur le site d'une exposition, il en coute 41$ pour 2 enfants et 2 adultes mais 37.50$ pour 3 enfants et un adulte. Quel est le prix de la rentree pour l'enfant et quel est le prix de la rentree pour l'adulte? il faut utiliser la methode de comparaison ou de substitution
Claude Tardif lui répond.

Calculs de minutes en heures 2009-02-23

Denis pose la question :
Je suis en train de suivre un cours en navigation maritime et je dois changer souvent des minutes en heures. ex: 495 minutes = ?h??

Je désire avoir le cheminement le plus simple a faire pour ce type de calcul. Je ne travail pas avec excell. Je veux une formule a faire seulement avec une calculatrice élémentaire. Merci pour votre aide, j'apprécie beaucoup votre coup de main. Denis.
Claude Tardif lui répond.

Hauteur d'un tétraèdre 2009-02-23

Sébastien pose la question :
Bonjour;

J'ai trouvé un exercice de maths sur internet pour m'entraîner, j'ai bientôt fini, il me manque juste la dernière question à laquelle je bloque. Voici l'énoncé : Sur les arêttes d'un cube, on marque les points I, J et K tels que Ai=AJ=AK=x, où x est un réel donné strictement positif et strictement inférieur à la longueur a de l'arête du cube.

La question 1) disait que le triangle IJK est équilatéral et que son aire est de( x² racine de 2)/2. La question 2) disait que AIJK est un tétraèdre et que son volume est de (x au cube) /6. Et la question où je bloque : 3) La perpendiculaire menée par A au plus (IJK) coupe ce plan en H. Calculer AH en fonction de x.

Merci de votre aide! Bonne journée.
Claude Tardif lui répond.

Un système de plusieurs équations et plusieurs inconnues 2009-01-22

Cédrick pose la question :
J'ai un problème écrit à résoudre est-ce que vous pouvez m'aider ?

Le premier est le tiers de la somme des deux autres.
La somme du premier et du deuxième est 13.
Le produit du deuxième et du troisième est 56.
Réponse: Le premier nombre est___________________
Le deuxième nombre est _________________
Le troisième nombre est _________________

Pierre-Louis Gagnon, Antoine Letarte at Claude Tardif lui répond.

Un volume d'une capacité minimal 2009-01-05

Pauline pose la question :
je doit faire un volume d'une capacité minimal de 2500 cm 3 en quell matiere que ce soit
* un prisme a base pentagonale non réguliere
* une sphere
* stella octangula
Pierre-Louis Gagnon lui répond.

La longueur de la corde 2008-12-24

Lucile pose la question :
Voici l'énoncé :

On appelle (C) un cercle de centre O et de rayon 6cm. A et B sont deux points du cercle (C) tels que AOB = 50°

Calculer la longueur de la corde [AB] (arrondi au millimètre). On justifiera soigneusement toutes les étapes.

Cela fait déja 1 semaine que je trouve pas la réponse a cet énoncé .

Pouvez vous m'aider ? Merci d'avance .
Pierre-Louis Gagnon lui répond.

Probleme de trigonométrie 2008-12-06

Maryne pose la question :
On donne AB=15cm, AC=30,5cm et A=35°. Calcule BC à 0;01cm près. Calcule B et C à 0,01° près. Calcule l'aire du triangle à 0,01cm² près. Sachant que le triangle n'est pas rectangle. Merci
Pierre-Louis Gagnon lui répond.

Fonctions dérivées 2008-11-28

Genevois pose la question :
Bonjour ! Je dois trouvé la dérivée en 2 de la fonction 40-5x². Or, je sais comment faire et je connais la réponse mais j'ai beau refaire et refaire le calcul, mon résultat n'est jamais le meme que celui du corrigé, j'ai donc un probleme de calcul, pourriez vous donc me donner le calcul détaillé s'il vous plait ? Merci d'avance !
Pierre-Louis Gagnon lui répond.

Une série géométrique 2008-11-23

anass pose la question :
je vx savoire est ce kil existe la somme de (1/n^x) avec n variant de 0 jusk à infini
nota:
lorsk x=1et 2 la somme reste tjrs facile mé lorsquil depasse 3 c difficile et merci
Pierre-Louis Gagnon lui répond.

La somme de son carré et de son cube 2008-11-05

halima pose la question :
Trouvez un nombre entier tel que la somme de son carré et de son cube soit égale à 9 fois le nombre entier suivant.
Pierre-Louis Gagnon lui répond.

J'ai l'équation X^n=Y Je cherche à sortir n. 2008-11-05

Jean-Philippe pose la question :
Bonjour.
J'ai l'équation X^n=Y Je cherche à sortir n.
Existe-t-il une équation donnant n=f(X,Y) ?
Pierre-Louis Gagnon et Émile Létourneau lui répond.

calcul heures et minutes 2008-06-08

cadare pose la question :
je n'arrive pas à comprendre et resoudre mes problèmes d'heures et de minutes,ex parti à 22h30, j'arrive à 7h15 quelle est la durée du trajet
Claude Tardif lui répond.

Pourcentage 2008-06-02

ferdjoukh pose la question :
un article passe de 12 euros à 10 euros. quel est le pourcentage de réduction? et quelle est l'opération à faire pour obtenir le résultat? merci
Antoine Letarte lui répond.

Le volume du tas 2008-05-28

ribot pose la question :
je cherche la formule mathematique du volume d un tas de cailloux formule employée dans le bâtiment
Thierry Moisan lui répond.

Un tetraèdre régulier 2008-05-05

delabroye pose la question :
La figure ci-contre est un tetraèdre régulier :
AB = AC = BC = AD = 6cm

1) Représente un patron de ce tetraèdre
2) Calcule le volume de ce tétraèdre
Thierry Moisan lui répond.

méthode pour trouver l'air d'un carré 2008-04-08

Mélodie pose la question :
je doit trouver au moins 4 manieres différentes de calculer l'air d'un carré. j'en ai déja trouvée 2 mais il m'en faut le plus possible...
1. longueur x largeur
2. division en triangles, puis air des triangles et multipler par l'air des triangles
Thierry Moisan lui répond.

Énigme 2008-04-06

Frédérique pose la question :
Tu es dans une pièce ou il y a 3 interrupteurs reliés a 3 lumières dans une autre pièce que tu ne vois pas.Comment fais-tu pour savoir a quelle lumière chacun des interrupteurs est relié si tu ne peux aller voir dans l'autre pièce qu'une seule fois!Merci a l'avance!!!
Claude Tardif lui répond.

Combien d'éleves fréquentent cette école? 2008-04-04

Jeff pose la question :
Une ecole compte sept fois plus d'éleve que d'enseignants et enseignantes .De plus , le nombre de membres du personnel non enseignant correspond a la moitié du nombre d'enseignats et enseignantes . Si l'on tient compte de l'ensemble des éleves , du personnel enseignant et du personnel non enseignante , on dénombre 714 personnes . Combien d'éleves fréquentent cette école?
Antoine Letarte lui répond.

La dérivée de f(x)=ln[(1/16)(-x^2+6x+16)] 2008-03-31

Mathilde pose la question :
Je viens de reprendre mes études et j'ai quelques lacunes, pourriez - vous m'aider à trouver la dérivée de cette fonction.
Comme ça je pourrais vérifier si mon résultats est juste avant de faire l'étude de fonction.
f(x)=ln[(1/16)(-x²+6x+16)]
Merci
Mathilde
Maxime Fortier Bourque et Pierre-Louis Gagnon lui répond.

Le terme suivants 2008-03-30

jacques pose la question :
voici 2 suites. Explique la logique qui permet de passer d'un terme a l'autre dans chacune des suites et trouve le terme suivants. 1)douze,5,trente,6,neuf,4,seize,... no.2) 26,vx,18,dt,36,tx,51,...
Maxime Fortier Bourque lui répond.

Qui sommes nous? 2008-03-28

Cédrick pose la question :
Nous sommes deux nombres inférieurs à 40. Le nombre 11 est un de nos facteurs. Le produit de nos chiffres est un facteur de 8. Si nous changeons nos chiffres de place nos noms de changent pas. Qui sommes nous?
Maxime Fortier Bourque lui répond.

la capcite en metre cube de ma remorque 2008-03-22

pages pose la question :
je voudrai connaitre la capcite en metre cube de ma remorque les dimensions font 124-95 -34 merci
Pierre-Louis Gagnon lui répond.

Un bénéfice de 5% 2008-03-11

mahiques pose la question :
Un propriétaire decide de vendre deux parcelles de terrains pour un montant total de 141750 F. Il fait un bénéfice de 15% sur la première et une perte de 10% sur la deuxième. L'ensemble de la transaction lui a rapporté un bénéfice de 5%.combien a-t-il vendu chacune des parcelles ?
Pierre-Louis Gagnon lui répond.

Logarithmique et semi logarithmique 2008-03-08

azaar pose la question :
Je veux savoir comment passer d'un échelle linière à l'échelle logarithmique ou semi logarithmique ?
Lierre-Louis Gagnon lui répond.

l'armature d'un prisme 2008-03-01

dufetre pose la question :
a l'aide d'une tige de 63cm on desire construire l'armature d'un prisme dont la base est un triangle equilateral et dont la hauteur mesure 3cm de plus que la la longueur du cote du triangle. Soit x la longueur du cote du triangle.exprimer en fonction de x la hauteur de ce prisme exprimer en fonction de x la longueur totale des aretes Quelle sera la longueur du cote du triangle. merci
Maxime Fortier Bourque et Thierry Moisan lui répond.

Combien y a t il d amis dans le groupe 2008-02-25

vaucher pose la question :
un groupe d amis souhaite organiser une sortie si chacun donnait 14 € il manquerait 4 € mais si chacun donnait 16€ il y aurait un excedent de 6 € combien y a t il d amis dans le groupe
Maxime Fortier Bourque lui répond.

exercice de trigonométrie 2008-02-19

Maxime pose la question :
Montrer que dans un triangle quelconque le produit des cosinus des angles cosA*cosB*cosC est inférieur ou égal à 1/8.
Pierre-Louis Gagnon et Thierry Moisan lui répond.

moyenne statistique 2008-02-16

jossan pose la question :
Annexe

nombre d'habitants Nombre d'agglomération centre de classe

3 ; 3.5 11 3.25

3.5 ; 4 16 3.75

4 ; 4.5 7 4.25

4.5 ; 5 10 4.75

5 ; 6 12 5.5

6 ; 8 10 7

8 ; 10 9 9

10 ; 15 13 12.5

15 ; 20 6 17.5

20 ; 32 5 26

Total 99

question : compléter la deuxième et troisième colonne (c'est fait) puis en utilisant la valeur centrale des classes calculer le nombre moyen d'habitants . arrondir la valeur à l'unité. on peut utiliser uniquement les fonctions statistiques de la calculatrice et écrire directement la valeur de N
Pierre-Louis Gagnon et Antoine Letarte lui répond.

La valeur absolue 2008-02-09

Elodie pose la question :
que signifie la notation x entre 2 traits verticaux?
Claude Tardif lui répond.

calcul des hh,mn,sec 2008-01-19

gillot pose la question :
bonjour, mon fils à des additions et soustractions d'horaire et je n'arrive pas à trouver la règle pour lui espliquer comment il faut faire il y a t il une formule pour les additions et soustractions merci par avance pour vos réponses
Claude Tardif lui répond.

Je voulais savoir d'où provient le signe # ?! 2008-01-17

Dimitri pose la question :
Je voulais savoir d'où provient le signe # ?! On l'appelle diez, sur les téléphones surtout, mais j'aimerai savoir plus précisément à quoi sert ce signe (autre que sur nos appareils) ! Et pourquoi, en anglais, s'il est placé avant un chiffre, on dit 'number' (par exemple #1, 'Number one'). Son origine m'interesse tout autant que son utilité !
Claude Tardif lui répond.

Arithmétique modulaire 2008-01-10

hausknecht pose la question :
ma grand mère a entre 60 et 80 ans.il y a un an son âge était un multiple de 3.dans deux ans son âge sera un multiple de 2,de 3 et de 9.cette année , c'est un multiple de 5.quel est l'âge de ma grand mère?
Claude Tardif lui répond.

Progression arithmétique 2008-01-08

parrot pose la question :
Bonjour je suis en 6ème et j'ai besoin d'aide pour un problème de math. Donc voila mon problème : Un renard a mangé 100 grains de raisins pendant une periode de 5 jours. Chaque jour, il a mangé six grains le plus que le jour précédent. Quel est le nombre de grains mangés le premier jour ?
Claude Tardif lui répond.

racine carre de 9 2008-01-01

hichem pose la question :
racine carre de 9
Claude Tardif lui répond.

800 poules pondent 800 oeufs en 8 jours 2007-12-17

LINDA pose la question :
800 POULES EN 8 JOURS PONDENT 800 OEUFS, COMBIEN 400 POULES VONT-ELLES PONDENT D'OEUFS EN 4 JOURS?
Claude Tardif lui répond.

Système à deux équations 2007-12-11

Fabrice pose la question :
un rectangle a 130 m pour périmetre. si on diminue sa longueur de 1 m et on augmente sa largeur de 1 m, l'aire augmentera de 14m². trouver les deux dimentions du rectangle. (on trouvera, au préalable, la difference des deux dimensions)
Claude Tardif lui répond.

Une sphere 2007-12-03

karine pose la question :
voici ce que je dois trouver ; j'aiune boule disco mesurant 48'' de diametre je veux savoir combien de petit miroir il y a sur cette boule si les petits miroires on 1'' carré ?
Claude Tardif lui répond.

n(n+1) est un nombre pair 2007-12-02

Christel pose la question :
Bonjour. J'aimerai savoir comment l'on peut démontrer que n(n+1) est un nombre pair. Si vous avez une méthode...Merci d'avance
Claude Tardif lui répond.

A=B+C+D+F+G+H+J 2007-11-27

Boubendir pose la question :
voila ma question et comme savoir les nombres additioné en etulisant le resultat

A=B+C+D+F+G+H+J

au debut ons a les B,C,D,F,G,H,J on connaissent leur valeur comment retrouver valeur on etulisant leur resultat
Claude Tardif lui répond.

F=4a-3c+6b 2007-11-22

olive pose la question :
comment calcule ton ?
F=4a-3c+6b
mon fils et en 4ème et je suis dépassée, je ne peut pas l'aider merci de le faire à ma place.
Claude Tardif lui répond.

La somme de deux fonctions 2007-11-19

maud pose la question :
Consigne : Ecrire la fonction f comme somme de deux fonctions u et v définies sur I. Donner le sens de variation de u et de v sur I. En déduire le sens de variation de la fonction f sur l'intervalle I indiqué. f(x)=-2x+(1sur x) I=]0;+infini[

Correction : Sens de variation de f sur I=]0;+infini[ On a f(x)=u(x) + v(x), avec {u(x) = -2x et v(x) = 1sur x La fonction u est strictement décroissante sur R, donc sur I ( droite avec coefficient directeur -2 négatif). La fonction v qui est la fonction inverse est stricyement décroissante sur [0;+infini[. Donc, la fonction f = u+v est strictement décroissante sur [0;+infini[.

Ma question : Pourquoi la fonction v et la fonction f ne sont pas définies sur le même intervalle que la fonction u c'est-à-dire sur l'intervalle I indiqué ?
Claude Tardif lui répond.

nombre d'or 2007-11-12

Léo pose la question :
On suppose que le rapport a+b/a est égal au nombre d'or (1+racine carrée de 5/é) a) Calculer (a+b) au carré et a+(a+b) en fonction de a. Je n'y arrive pas. Pouvez-vous m'aider? merci
Claude Tardif lui répond.

La somme de deux entiers naturels est égale à 83. 2007-11-06

abraham pose la question :
La somme de deux entiers naturels est égale à 83. Si on divise le plus grand par le plus petit , on obtient 4 comme quotient et 17 comme reste. Quels sont les deux nombres ? Justifier clairement la réponse. Merci de me répondre au plus vite.
Claude Tardif lui répond.

Le symbole ∈ epsilon 2007-10-10

Cora pose la question :
Je veux aider ma fille avec ses devoirs. C'est quoi le symbole qui semble un E, mais c'est un demi-circle? ie:X ∈ N
Claude Tardif lui répond.

La somme des «N» premiers nombres naturels impairs 2007-10-09

Dominique pose la question :
Quelle expression algebrique représente la somme des «N» premiers nombres naturels impairs ?
Claude Tardif lui répond.

les données sont inconsistantes 2007-10-03

Mikee pose la question :
Bonjour, Je me casse la tete depuis ce matin et la je donne ma langue au chat. Je n'arrive pas a resoudre ce probleme. J'ai 30 agents qui appellent dans la journee et realisent 322 questionnaires (long+court) telephonique avec une duree moyenne de conversation 294 secondes. dans ces 322 qestionnaires : -ils realisent 313 questionnaires Long avec une duree moyenne de 317 secondes. -ils realisent 9 questionnaires Court avec une duree moyenne X. je cherche X.

((Interviews réalisées*Durée moyenne de conversation)-(Interviews réalisées avec la question Q2*Durée moyenne de conversation avec la question Q2))/(Interviews réalisées-Interviews réalisées avec question Q2)=Durée moyenne de conversation sans la question Q2

Q2=questionnaire Long
Claude Tardif lui répond.

un jardinier plantent 10 arbres 2007-09-30

yannick pose la question :
un jardinier plantent 10 arbres.il a reussi a les disposer en formant 5 ligne de 4 arbres. retrouver une disposition possible
Claude Tardif lui répond.

Quel est ce nombre 2007-09-30

fred pose la question :
Un groupe de 7 enfants vient de recevoir une grosse quantité de billes. ils font le partage : toutes les billes sont distribuées et ils en ont chacun le même nombre. le nombre total de billes s'écrit avec les mêmes chiffres que 1991. Quel est ce nombre
Claude Tardif lui répond.

pente nulle 2007-08-31

stephanie pose la question :
si la pente dune droite est nulle alors cette droite est quoi ???
Claude Tardif lui répond.

Exemples d'équations a résoudre 2007-08-17

Stéphanie pose la question :
j'aimerais connaitre les terme pour désigner pour les chiffres dans l'algèbre et pouvoir avoir quelques exemples d'équations a résoudre!!
Claude Tardif lui répond.

Je suis le plus petit entier de 3 chiffres. Qui suis-je? 2007-07-18

Auerhaan pose la question :
De quel chiffre parle-t-on?
Je suis le plus petit entier de 3 chiffres Qui suis-je?
Le cahier de vacances donne comme solution : 120, ce qui me parrais très étrange !) Merci d'avance pour votre réponse..!
Claude Tardif lui répond.

cos^3x+sin^3x=1 2007-06-07

sannier pose la question :
bonjour je bloque sur l'equation: cos^3x+sin^3x=1 j'ai essayé toute les formules de trigonometrie je n'y arrive pas.connaissez vous un moyen de resoudre cette equation ou de m'orienter?
Claude Tardif lui répond.

Deux terrains 2007-06-04

Aurelie pose la question :
Deux terrains, un rectangulaire et l'autre carré, ont la même superficie. Si tu sais que la longueur du terrain rectangulaire mesure 40m et que le carré mesure 20m de côté, détermine la largeur du terrain rectangulaire.
Claude Tardiff lui répond.

Combien d'heures et de minutes 2007-05-30

masson pose la question :
pouvez vous m'aider pour resoudre ce probleme car je suis perdue combien d'heures et de minutes dormez vous si vous vous couchez a 22h15 et si vous vous levez a 6h57? car en suivant le raisonnement de la soustraction d'heure je trouve 15h12 et je trouve cela pas logique merci d'avance de votre aide
Claude Tardif lui répond.

Combien vais je avoir de surface ? 2007-05-22

Maëlle pose la question :
J'ai 5m3 de terre et veux en mettre 5 cm partout pour faire un terrain de jeux. Combien vais je avoir de surface ?
Claude Tardif lui répond.

Je veux convertir le m3 en kg 2007-05-14

Abdellah pose la question :
je veux convertir le m3 en kg
Claude Tardif lui répond.

Dénombrement 2007-05-11

Cosse pose la question :
de combien de façons peut-on faire 6 poules de 5 équipes avec 30 équipes? ou combien de partitions en 6 ensembles de 5 éléments dans un ensemble de 30 ? et aussi pourquoi ?
Claude Tardif lui répond.

Mesure/volume 2007-05-09

Ashley pose la question :
Calcule le volume des 2 contenants et quels est le plus grands.
Claude Tardif lui répond.

Le pourcentage en +ou en- que représent la diférence de 2 nombres 2007-04-29

Jean pose la question :
pouvez vous me donner la formule pour trouver le pourcentage en +ou en- que représent la diférence de 2 nombres ex: 8594 et 7634
Claude Tardif lui répond.

proposition d'une fonction 2007-04-10

Benoit pose la question :
Proposez une fonction f(x,y) dont l'ensemble de niveau c=0 est {(x,y) : x = 0} U {(x,y) : x*2+y*2=1} Je remarque l'équation d'un cercle centré à (0,0) et de rayon 1 ainsi que la droite x=0 mais ça ne clique pas. Merci de m'aider.
Claude Tardif lui répond.

Illusion géométrique 2007-04-04

Dominique pose la question :
Je n'arrive pas expliquer la modofocation de surface.
Claude Tardif lui répond.

Le perimetre d un cercle 2007-03-15

Martins pose la question :
Comment calculer le perimetre d un cercle sachant que le diametre et de 25 de plus que le perimetre
Claude Tardif lui répond.

nombre entier 2007-03-07

ROUILLARD pose la question :
Quel est le plus grand entier inférieur au quotient de 200/9 ? Merci de votre réponse. Je pense à 19. Est-ce exact ?
Claude Tardif lui répond.

Dérivée logarithmique 2007-03-04

Albert pose la question :
Déterminer la dérivée première des fonctions logarithmiques suivantes : 1) f (x) = x exposant x 2) f (x) = x exposant e exposant 2x
Claude Tardif lui répond.

Qui suis-je? 2007-02-28

un parent pose la question :
bonjour, le problème est le suivant : Qui suis-je? Mon tiers augmenté de mes deux cinquième est égal à la moitié de mon triple Serez t'il possible d'avoir la solution à ce problème et que je puisse y comprendre un peu quelque chose quand même Je vous remercie d'avance et espère bientôt vous lire
Claude Tardif lui répond.

algèbre et fractions 2007-02-05

marion pose la question :
Une certaine somme était inscrite sur un livret de caisse d'épargne au 1er janvier. Le 1er mars, on retire le tiers de ce qui était placé au 1er janvier. Le 1er juin, on retire le quart de ce qui était placé au 1er janvier. Il reste sur ce livret une somme égale à 1/7 des sommes retirées plus 1 600 Quel était le montant du livret d'épargne au 1er janvier?
Claude Tardif lui répond.

exposant 0 2007-01-25

Judith pose la question :
Je suis stagiaire dans une classe de sixième année et j'aimerais pouvoir expliquer à mes élèves pourquoi tous les nombres exposant 0 donne 1 comme réponse. ( 10 exposant zéro = 1) Merci!
Claude Tardif lui répond.

il y a deux contenant 2007-01-23

Eric pose la question :
il y a deux contenant un de 3 litre et un de 5 litre les deux sont vide comment en les remplisant on peux obtenire 4 litre
Claude Tardif lui répond.

Le produit des fractions 2007-01-23

Jasmine pose la question :
Au mois de mars, le poids de la brebis augmente d'un huitième. Au mois d'avril, son poids augmente d'un neuvième, au mois de juin d'un onzième. Par quelle fraction faut-il multiplier son ancien poids pour obtenir son nouveau poids?
Claude Tardif lui répond.

boulier français 2007-01-19

Stéphanie pose la question :
Je prépare une exposition sur le centième anniversaire du vieux couvent de Château-Richer dans la province du Québec qui s'ouvrira en mai 2007. Dans ce couvent les soeurs de la Congréagation du Perpétuel Secours ont enseigné pendant de nombreuses années. Pour mettre en valeur, le site et l'exposition, nous souhaitons mettre les visiteurs à l'épreuve dans l'ambiance d'une classe d'antan (début 20ème siècle) avec, entre autres, les bouliers français que nous possédons et leur faire faire des exercices de mathématiques avec. Malheureusement, nous ne savons pas comment faire les quatre opérations de base (addition, soustraction, multiplication et division) avec. Pouvez-vous nous l'expliquer de façon détaillé, s'il vous plaît?
Claude Tardif lui répond.

Horaire à créer 2007-01-18

Suzette pose la question :
Je ne sais quel logiciel utiliser pour effectuer mon travail.Quelle science peut résoudre mon problème? J'ai 16 personnes qui effectueront 5 tâches différentes sur une période de 11demi- journées. Chaque tâche est accomplie par 3 personnes èa la fois par demi-journée. sauf la 5e tâche qui sera accomplie par 4 personnes. Je dois distribuer le travail à chacune des 16 personnes pour chaque demi-journée afin que toutes aient accompli les 5 tâches. Dites-moi comment m'y prendre, svp. Et si j'ai 17 personnes, j'aurai 2 groupes de 4 personnes et 3 de 3 personnes
Claude Tardif lui répond.

Multiplier et soustraire des nombres négatifs 2007-01-11

Sylvie pose la question :
Voici trois nombres entiers: (-5), (-3) et (-4). On retranche le troisieme au produit des deux premiers, ecris la situation et donne le resultat.
Claude Tardif lui répond.

exercices corrigés 2007-01-09

Zribi pose la question :
si je peut avoir des exercice corrigé
Claude Tardif lui répond.

Des grains de blé 2007-01-06

Renaud pose la question :
Remplir un échiquier avec des grains de blé de la façon suivante un grain dans la 1ère case, deux grains dans la 2ème case, ainsi de suite en doublant jusqu'à la 64e case Combien de grains de blé il y a dans la 64e case?
Claude Tardif lui répond.

45 000 litres d'eau a 15 degres 2006-12-21

Troussiere pose la question :
j'ai 45 000 litres d'eau a 15 degres combien de litres d'eau a 50 degres doit on rajouter pour obtenir une eau a 25 degres?
Claude Tardif lui répond.

sup {sin n, n est un entier } 2006-12-17

Madi pose la question :
sup {sin n, n est un entier }
Claude Tardif lui répond.

l'intérêt 2006-12-06

Frédéric pose la question :
Bonjour, je me permet de vous envoyer un "petit" problème mathématique car je suis très mauvais même pour de très simples opérations comme celle qui va suivre!(lol). Si vous pouviez m'aider cela m'éviterai beaucoup de recherches inutiles. Voici le problème : une personne a placé 117180 en banque et cette somme lui rapporte tous les trimestres 936 d'intéret. Premièrement, peut on connaître le taux d'intéret ? Et deuxièmement, combien lui rapporterai, en intéret, la somme de 97180 ? Merci d'avance pour votre aide.
Claude Tardif lui répond.

Origine du signe racine carré 2006-11-30

Kévin pose la question :
Je suis simplement un élève de 3eme très curieux et j'aimerais savoir d'où vien le signe de la racine carré (l'espece de V) c'est une question toute bete mais ma prof de math ne peu me répondre le pouvez vous?
Claude Tardif lui répond.

volume d'un cône 2006-11-29

Emmanuel pose la question :
On peut diviser un cube en 3 pyramides et ainsi en déduire le volume d'une pyramide. Mais comment peut-on déduire le volume d'un cône de celui d'un cylindre? Comment visualise-t-on la division d'un cylindre en trois?
Claude Tardif lui répond.

Quel est ce nombre? 2006-11-28

Dourlent pose la question :
je multiplie un nombre par 10 et il augmente de135. Quel est ce nombre?
Claude Tardif lui répond.

addition et soustraction des heures, minutes, secondes 2006-11-22

Halnais pose la question :
13 h. 25 mn + 18 h. 06 mn
23 h. 31 mn + 19 h. 33 mn

je ne me souviens plus très bien de ces opérations, faut-il additioner les heures à part puis les minutes, etc. pour les heures je crois qu'il ne faut pas dépasser 24 h. Pourriez-vous m'aider, et me donner le résultat, merci infiniment.
Claude Tardif lui répond.

les fraction 2006-11-07

Coullet pose la question :
béreger boit les 3/5 d'une bouteille de 3/4 de litre jennifer boit les 4/5 d'une bouteille de 1/2 litre diego boit les 2/5 d'une bouteille de 1 litre, puis le quart de ce qui lui reste
Claude Tardif lui répond.

la somme des aires des deux dommaines 2006-11-06

Nina pose la question :
Une ficelle de longeur L = 1m est coupée en deux morceaux. Avec l'un des morceaux, de longeur x, on forme un carré, et avec l'autre un cercle. A quel endroit doit on couper la ficelle pour que la somme des aires des deux dommaines obtenus soit minimale?
Claude Tardif lui répond.

équations avec les ages 2006-11-06

Ruffin pose la question :
Sébastien dit a Aurélie: vous avez 36 ans et j'ai deux 2 fois l'âge que vous aviez quand j'avais votre âge. Quel âge a Sébastien?
Claude Tardif lui répond.

Les cinq ligner de chiffre 2006-11-02

Alex pose la question :
comment faire pour trouver les cinq ligner de chiffre apres les avoir observer les sept premiere

1
11
21
1112
3112
211213
312213
-
-
-
-
-

Claude Tardif lui répond.

Des mots aux équations 2006-11-02

Julie pose la question :
La diffÃ©rence de deux nombres, x et y est de 28. Le nombre y correspond aux huit neuviï¿½mes du nombre x. Trouvez ces deux nombres.
Claude Tardif lui répond.

Taux à déterminer 2006-11-01

Barrault pose la question :
Une certaine année,un article augmente d' un certain taux "t" au premier semestre puis d' un taux triple du premier au second semestre, sachant que l' augmenation globale sur l' année est 66.75%; uels sont les taux pour chacun des deux semestres de l' année?
Claude Tardif lui répond.

Maximiser l'aire d'un triangle isocèle 2006-10-31

Flav pose la question :
ABC est un triangle isocèle en A tel que AB= 1 pour quelles valeurs de BC, l'aire de ce triangle est-elle maximale?
Claude Tardif lui répond.

Un carré ABCD 2006-10-31

Barrault pose la question :
Dans un carré ABCD de coté a , avec I le milieu du cote AB je cherche a exprimer CI et CA en fonction de a en demontrant que les vecteur CA+CB=2CI comment faire?
Claude Tardif lui répond.

logarithme 2006-10-24

Julie pose la question :
Loga(x^2-4) - loga(x-2)
Claude Tardif lui répond.

Avec les chiffres 1,5,6,7, vous devez arriver a un total de 21 2006-09-28

Danny pose la question :
J'ai un problème qui est le suivant: Avec les chiffres 1,5,6,7, vous devez arriver a un total de 21 en les utilisant qu'une seule fois et en utilisant la multiplication, l'addition, la division et la soustraction...
Claude Tardif lui répond.

le prix de départ 2006-09-10

un élève pose la question :
Une jupe coûte 36 euros après une démarque de 20% quel est le prix de départ moi j'ai trouvé 45 euros mais je n'ai pas la formule de calcul exacte
Claude Tardif lui répond.

l'explication de 1 - 1,1 exposant -5 2006-08-12

Karin pose la question :
Ma question est l'explication de 1 - 1,1 exposant -5
Claude Tardif lui répond.

Combien a t-il rapporté dans une journée ? 2006-06-21

Madame Moro pose la question :
On lui donne un prix au km soit 1630 €/km, Marc a réalisé 211 m dans la journée, Combien a t-il rapporté dans une journée ?
Claude Tardif lui répond.

Quel serait le cout total de production de 500 entrees 2006-06-10

Suzanne pose la question :
Chaque operateur traite des donnees pendant 7 heures 1/2 par jour, et peut s'acquitter d'une demande en 3 heures et 3/4. Combien d'operateurs faudra-t-il pour traiter 50 demandes en 1 jour.

Vous etes surveillant a l'entree des donnees. Pour atteindre vos objectifs vous engagez temporairement 2 commis a un salaire de 10$ et a raison de 8 heures par jour. Si chaque personne peut produire 50 entrees par jour, quel serait le cout total de production de 500 entrees.

Claude Tardif lui répond.

Un commis temporaire reclame 1200$ 2006-06-10

Suzanne pose la question :
Un commis temporaire reclame 1200$ pour 2 semaines de travail (5 jrs semaine) a raison de 15$ de l'heure. Au cours de ces 2 semaines, le commis a inclus par erreur dans ses heures de travail la periode de 30 min pour la pause de diner. Quel est le montant a payer...J'ai essaye de trouver une reponse et je n'y arrive pas.
Claude Tardif lui répond.

Dernier théorème de Fermat 2006-06-06

Jean-Claude pose la question :
Bonjour, je suis étudiant au baccalauréat en mathématique et j'aimerais savoir où et comment je peux me procurer la démonstration du dernier théorème de Fermat écrite par Wiles.
Claude Tardif lui répond.

Questions de Probabilités 2006-05-18

Guy pose la question :
Le directeur d'un cirque a retenu cinq numéros pour composer son spectacle : les chiens savants, l'illusioniste, les clowns, les tapézistes et les acrobates.

de combien de façons peut il composer son spectacles?

En supposant qu'il y ait équiprobabilité dans le choix de la composition du programme, calculer la probabilité de chacun des événements suivants:

les clowns terminent le spectacle

les acrobates débutent ou terminent le spectacle

les trapézites suivent immédiatement les clowns

les clowns sont séparés des chiens savants par les trapézistes et seulement par eux.

Claude Tardif lui répond.

Ordre des opérations 2006-05-15

Chantal pose la question :
2324/4-153+619= je sais pas comment calculer merci
Claude Tardif lui répond.

Volume d'un cône 2006-04-24

Christelle pose la question :
Caroline décide de se servir de ses connaissances mathématiques pour "rouler" son petit frère: "Arthur, dit-elle, je te propose que nous mettions chaucun un euro dans l'achat d'un cône glacé. Je mangerai la première, jusqu'à mi-hauteur, et toi, tu auras la seconde moitié." Combien la part de Caroline représenterai-elle par rapport à celle de son petit frère s'il acceptait ?
Claude Tardif lui répond.

ABCD est un carré de 4 cm de côté 2006-03-06

Elodie pose la question :
ABCD est un carré de 4 cm de côté. On découpe un peit carré AEFG d côté x. Que vaut x si l'aire de AEFG est la moitié de l'aire de ABCD?
Claude Tardif lui répond.

soustractions avec les heures 2006-03-01

Bossedi pose la question :
Je m'appelle Bossedi et malheureusement j'ai un petit souci en ce qui concerne le calcul des heures! Je ne me rappelle plus comment s'effectue une addition ou un soustraction avec les heures comme par exemples 22h30-7h00. Merci infiniment de bien vouloir m'aider.
P.S.: Je me souviens qu'une lectrice du surnom Jennifer avait deja poser ce genre de probleme, mais avec la seule difference que dans son cas, c'etait i j'ai bonne memoire, 09h45 moins 07h52! Quelques choses de ce genre. Dois-je +tot ercire 11h30-07h00?
Claude Tardif lui répond.

Des exercices complémentaires 2006-02-26

Nathalie pose la question :
Bonjour, mon fils est en 2e année dans une école de Montréal. Il éprouve des difficultés en mathématiques. Auriez-vous des sites à me suggérer dans lesquels je pourrait trouver des exercices complémentaires à lui faire faire.
Claude Tardif lui répond.

probleme sin cos 2006-02-19

Thibault pose la question :
mon probleme commence par: f(x)=sinx (sinx+1)+ cos²x
donc en le dévellopant on trouve: f(x)= sin²x + sinx + cos²x
et apres ce que je ne comprend pas est que par la suite on trouve: f(x)= 1+sinx
qu'est-ce qui fait que l'on trouve ce resultat??
Claude Tardif lui répond.

Petit Problème 2006-02-19

Jean-Philippe pose la question :
30 ouvriers travail 12 jours pour effectuer un travail.
Combien 20 ouvriers vont-ils mettre à effectuer ce travail ?
Hormis une règle de trois existe t-il un autre moyen d'arrivée à trouver une solution ?
Claude Tardif lui répond.

Matrice 2006-02-01

Kader pose la question :
mon probleme est le suivant soit deux matrices carrees A et B d'ordre n qui sont anticommutatives AB= -BA , demontrer que au moins une des deux matrices n'est pas inversible si n est impair. je n'arrive pas a utiliser le fait que n soit impair, trouver le rapport entre n impair et inverse des matrices, je pars sur la base de DETAB=DETA*DETB
Claude Tardif lui répond.

probleme de matrice 2006-02-01

Un eleve pose la question :
mon probleme est le suivant soit deux matrices carrees A et B d'ordre n qui sont anticommutatives AB= -BA , demontrer que au moins une des deux matrices n'est pas inversible si n est impair.
Claude Tardif lui répond.

exposant négatif 2006-01-23

Jean pose la question :
je suis un grand-père qui veut aider sa petite fille :
niveau 4ème
3 exposant -2 =
-3 exposant -4 =
3 exposant -9 =
Je vous remercie de votre aide.
Corldialement.
Jean
Claude Tardif lui répond.

L'objectif est de trouver 2005-11-27

Sandie pose la question :
L'objectif est de trouver "a et n" :

2 = a.0,6^-n
0,3 = a.2^-n
Claude Tardif lui répond.

Une énigme échelle/échafaudage(ou boite) 2005-11-08

Christian pose la question :
J'ai un problème & souhaite demander votre aide pour résoudre une énigme échelle/échafaudage(ou boite)
Claude Tardif lui répond.

problème de trigonométrie 2005-11-01

Manon pose la question :
Soit un triangle ABC, de cotes a , b et c, avec A=45° et B=60°.
Apres avoir demontre que 3a²-2b²=0 (que jai fais en utilisant la regle du sinus) et a²-2c²+2ac=0 (que jai fait en utilisant la regle du cosinus), vous montrerez que laire du triangle ABC peut sexprimer: { [ 3 + racine carre 3 ] / 12 } b² unites.

Je ne sais pas comment arriver a cette expression de laire. Je narrive pas a exprimer c² et ac en fonction de b².. et je pense que ca pourrait vraiment aider..
puisque je suis arrive a letape:
ac[(racine carre 3) / 4]
avec ac = a² + c² - b²
et a² = 2/3 b²
ms c²= 1/3 b² + ac
Claude Tardif lui répond.

Inverse 2005-10-18

Pauline pose la question :
Défi ! a et b désignent deux nombres distincts non nuls. Peut-on trouver un nombre à retrancher du numérateur et du dénominateur du quotien a/b pour obtenir son inverse b/a?
Claude Tardif lui répond.

2^(2^1954) est-il premier? 2005-10-04

Un eleve pose la question :
2^{(2¹⁹⁴⁵)}+1 est-il premier?
Claude Tardif lui répond.

Partages inégaux 2005-09-29

Un eleve pose la question :
Alex et julie ont ensemble 4728 .- euro Si Alex donne 538.- euro à Julie, ce dernier aurait alors le triple de Julie. Quelle est la somme possédée de chacun?
Claude Tardif lui répond.

Calcul dun profil fictif 2005-09-29

Mr madry loïc pose la question :
je suis actuellement en formation pour devenir dessinateur projeteur en BTP ; je rencontre un problème vis à vis d'une égalité qui normalement devrait mettre acquise ( elle doit être issue de thalès ou de l'égalité des proportion ?) cependant, je n'arrive pas trouver le fondement de cette égalité. pourriez vous m'aider à éclaircir cette relation fondamentale afin de poursuivre mon étude sur le calcul de profil en travers (pour les travaux publics) .
Claude Tardif lui répond.

exercice! 2005-09-28

Un eleve pose la question :
soit x et y deux nomres réels telque:
1 ≤ x²-x*y+y² ≤ 2
1) Montrer que: 2/9 ≤ x⁴+y⁴ ≤ 8
2) Montrer que: x^2*n+y^2*n ≥ 2/3^2*n telque n est un nombre entier naturel et n≥3.
Chris Fisher lui répond.

Mon problème (né d'un retour aux conclusions du prix Nobel d'économie ) revisité 2005-09-27

Nzitat pose la question :
Soit L un sensemble de distributions de probabilités. Désignons par p une distribution de probabilité quelconque. En clair p=(p0,..., pm) où m >0 est fini. Appelons Vi, i=1,...,n, une fonction définie sur L et à valeurs dans l'ensemble des réels. De même Wj, j=0,...n est une fonction définie sur L et à valeurs dans l'ensemble des réels. Vi, Wj sont définies ainsi pour tout p:....
Claude Tardif lui répond.

Problème avec rapport point, prix... 2005-09-08

Nico pose la question :
Le prix d'un diamant est proportionnel au carré de son poinds. Un diamant de 0.45 g vaut 7500euros.

1. Combie coute un diamant de 0.693 g ?

2. Quel est le poids d'une diamant valant 45000 euros ?

Je vous demande pas de le raisoudre à ma place mais j'aimeré comprendre comment je peut calculé le rapport entre le point et le prix.

Claude Tardif lui répond.

Le prix d'un diamant est proportionnel au carré de son poinds 2005-09-07

Nico pose la question :
Le prix d'un diamant est proportionnel au carré de son poinds. Un diamant de 0.45 g vaut 7500euros.

1. Combie coute un diamant de 0.693 g ?

2. Quel est le poids d'une diamant valant 45000 euros ?

Je vous demande pas de le raisoudre à ma place mais j'aimeré comprendre comment je peut calculé le rapport entre le point et le prix.

Claude Tardif lui répond.

quel sont les plus grands diviseurs communs? 2005-09-07

Sylvain pose la question :
quel sont les plus grands diviseurs communs?
Claude Tardif lui répond.

Exposant 2005-09-06

Enzo pose la question :
Puis-je savoir combien donne 2 exposant 100 ? et 9 exposant 3012 ?
Claude Tardif lui répond.

5 points équidistants sur la surface d' une sphère 2005-08-15

Jean pose la question :
J' aimerais placer 5 points équidistants sur la surface d' une sphère. Si vous aviez une formule simple pour un néophyte, cela m' aiderais beaucoup.
Claude Tardif lui répond.

combien de fruits de chaque sortes? 2005-06-13

Halloy pose la question :
j'ai un panier de 32 fruits au total dans mon panier, j'ai 3 fois plus de bananes que de pommes et 4 fois plus de poires que de pomme. Combien il y a de bananes, de poires et de pommes dans mon panier?
Claude Tardif lui répond.

problème de math 2005-06-03

Nadia pose la question :
1* La somme de 3 multiples de 6 consécutifs est 72.Quels sont ces nombres?

2* Dans la fabrication d’un alliage, on utilise 5g de manganèse pour 32g de fer.
a) Quelle quantité de manganèse retrouve-t-on dans un morceau de cet alliage s’il contient 512g de fer? 00015166

b) Quelle est la masse totale de ce morceau si le fer et le manganèse en sont les seules composantes?

3*...
Claude Tardif lui répond.

Problème de géométrie 2005-04-29

Christian pose la question :
C un cercle de centre I et de rayon 3 cm. SORT est un carré inscrit dans le cercle C M est un point quelconque de C Calculer la somme des carrés des distances de M aux sommets du carré (MS2 + MO2 +MR2 + MT2) Cette somme dépend-elle de la position de M sur le cercle ?
Claude Tardif lui répond.

Un repère orthonormal 2005-04-26

Ylène pose la question :
Dans un repère orthonormal, le point A a pour coordonnées (-2;3) et le point B a pour (4;-5). A partir des coordonnées des points A et B on propose les calculs suivants:

a/ (-2+4 sur 2 ; 3-5 sur 2)
b/ (4+2; -5-3)
c/ racine carré (4+2)²+(-5-3)²

dans chaque cas, quelle est la notion géométrique ainsi mise en évidence?

Claude Tardif lui répond.

mod n 2005-04-26

Jean pose la question :
Réecrire (5A27)en base 16 changer en base 8 ( (2n)!+ 1) (mod n) (1-764n) (mod n) (n+1)exposant 78355 (mod n) PPCM(n!+1 , n!)
Claude Tardif lui répond.

P(x+1)-P(x)=x 2005-04-21

Etienne pose la question :
~P(x)=a x³+ b x²+ c x
~P(x+1)-P(x)=x²
question: trouver les trois nombres a,b et c.
Claude Tardif lui répond.

Une réduction de 40% 2005-04-21

Isabelle pose la question :
une famille composée de 3 enfants, et 2 adultes partent en expédition. ils payent au total 80€ sachant que les enfants bénéficient d'une réduction de 40% combien payent les parents et les enfants ?
Claude Tardif lui répond.

Avec les chiffres 1 3 4 6... 2005-04-14

Ambre et Miel pose la question :
avec les chiffres 1 3 4 6 utilisé une seule fois chacun soit en div multipl addit ousoustr je dois avoir 24 comme résultat
Claude Tardif lui répond.

1 ellipsoïde et une sphère 2005-04-04

Tihon pose la question :
Dans le cadre de mon mémoire réalisé à l'université de Liège (Belgique), je suis amené à savoir si 1 ellipsoïde et une sphère ont ou n'ont pas d'intersection...Quelqu'un peut-il m'aider??
Claude Tardif lui répond.

La limite de l'aire du domaine colorié 2005-03-21

Rita pose la question :
bonjour un petit problème qui m'a l'air bien compliqué et je n'est pour le moment aucune pistes pour demarré un carré de coté 1 est divisé en 9 carrés identiques et le carré central est colorié chacun des 8 carré qui restent est à son tour divisé et colorié suivant le meme procédé et on continue indéfiniment quelle est la limite de l'aire du domaine colorié?
Claude Tardif lui répond.

6 poules pondent 6 oeufs en 6 jours 2005-03-01

Nathalie pose la question :
SACHANT QUE 6 POULES PONDENT 6 OEUFS EN 6 JOURS, COMBIEN 12 POULES PONDENT D'OEUFS EN 12 JOURS?
Claude Tardif lui répond.

l'aire d'un carré 2005-02-24

Un eleve pose la question :
calculer l'aire d'un carré parfait sachant que les diagonales mesurent 8 mètres

Je ne sais pas comment lui expliquer.
Claude Tardif lui répond.

le système RSA 2005-02-19

Un eleve pose la question :
Je suis actuellement en classe préparatoire MP au lycée Henri Poincaré de Nancy et je souhaiterais obtenir des informations sur l'exponentiation modulaire car je réalise un TIPE sur la cryptographie et plus particulièrement le système RSA. pourriez-vous m'indiquez en quoi consiste l'exponentiation modulaire et comment cela fonctionne.
Claude Tardif lui répond.

il y a 1/6 de voitures bleues, 2005-01-24

Facrice pose la question :
il y a 1/6 de voitures bleues, 2/9 de voitures rouges, 5/12 de voitures blanches et 1/8 de voitures vertes. Sachant que 15 voitures sont d'une autre couleur. Combien y a t il de voitures de chaque couleur.
Claude Tardif lui répond.

convertir une duree en heure et minute 2005-01-12

Sébastien pose la question :
pouvez vous me donner la formule permettant de convertir une duree en heure et minute precise pour exemple : 589 minutes donne 10h35min. Quelle serait donc la formule pour passer directement de 589 min a 10h35 (sans avoir 9h81)?
Claude Tardif lui répond.

-1 exposant 4 2004-12-19

Denis pose la question :
ma question est : -1 exposant 4 = ? Quand nous avons une base négative sans parenthèse comme ma question
Diane Hanson lui répond.

J'ai deux fois l'âge que tu avais quand 2004-12-03

Un eleve pose la question :
Julien dit à Nicolas:"J'ai deux fois l'âge que tu avais quand j'avais l'âge que tu as.Quand tu auras l'âge que j'ai la somme sera égale à 63".A toi de trouver l'âge de Julien et de Nicolas.
Claude Tardif lui répond.

Nombre premier 2004-11-01

Katia pose la question :
Pouvez-vous me dire comment savoir si un nombre est premier?
Claude Tardif lui répond.

programme de tracé 2004-10-21

jean-yves pose la question :
pourriez vous me donner la définition de: qu'es ce qu'un "programme de tracé"
Claude Tardif lui répond.

La multiplication d'un nombre par 137 2004-10-19

Jacques pose la question :
En posant la multiplication d'un nombre par 137, un élève a oublié de décaler vers la gauche le troisième produit partiel. Il trouve un résultat qui est inférieur de 22860 au bon résultat. Quel était le nombre multiplié? Justifier.
Claude Tardif lui répond.

Un problème de math 2004-09-10

Sophie pose la question :
(V est en fait le signe de la racine carrée)

(3 / V27) x ( V75 ) = ???
Claude Tardif lui répond.

(x+y)^n = x^n + y^n + Z 2004-03-18

Jean-Sébastien pose la question :
Bonjour, je me m’appelle Jean-Sébastien et je suis étudiant en secondaire 4. Je me demandais s’il est possible de développer le terme (x+y)ⁿ, lorsque n est un entier positif. Il est évident que xⁿ+yⁿ fera partie de la réponse mais comment définir le reste (Z dans l’exemple ci-dessous)?

(x+y)² = x²+y²+2xy

(x+y)ⁿ = xⁿ+yⁿ+ Z

P.S. : Une preuve mathématique démontrant la possibilité ou l’impossibilité du problème serait grandement appréciée, merci.

Claude Tardif lui répond.

Marie achète un croissant et une tartelette 2004-02-01

M. et Mme Simoneton pose la question :
Marie achète un croissant et une tartelette. Elle paie 1,64 €
Isabelle achète un croissant et un pain au chocolat. Elle paie 1,51 €
Marc achète un poain au chocolat et une tartelette. Elle paie 1,77 €
Trouver le prix d'un croissant, d'une tartelette et d'un pain au chocolat.
Claude Tardif lui répond.

Projections quadratiques 2003-12-14

Jennifer pose la question :
Je vous serais très reconnaissante si vous pouviez m'expliquer :
pourquoi la moyenne des projections quadratiques d'un segment sur un axe (en 3D) est égale à ^a*a/₃ sachant que "a" représente la longueur de ce segment et que toutes les orientations du segment sont également probable.
Claude Tardif lui répond.

Des tables trigonométriques 2003-11-20

Jean-Jacques pose la question :
Je suis à la retraite et en train de mettre à jour mes connaissances en trigonométrie.

On peut facilement trouver les rapports entre les côtés d'un triangle droit ayant des angles secondaires de 30, 45 et 60 degrés, mais comment s'y prend-on pour calculer les rapports entre les côtés d'un triangle droit ayant des angles secondaires de valeurs intermdiaires. En d'autre mot, comment s'y prend-on pour faire le calcul détaillé des tables trigonométriques.

J'ai cherché en vain dans divers textes de géométrie la réponse à cette question. Merci à l'avance pour l'attention que vous porterez à ma requête.

Claude Tardif lui répond.

Les 3 maisons 2003-11-16

Amandine pose la question :
Sur la figure ci-contre on peut voir 3 maisons A, B et C nouvellement construites. Toutes les 3 doivent être reliées au gaz, à l'eau et à l'électricité. Cependant, tous ces raccordements doivent impérativement avoir lieu dans un même plan et les câbles et autres canalisations ne peuvent pas se croiser. Comment doit-on s'y prendre pour relier les 3 maisons à l'eau, au gaz et à l'électricité?
Claude Tardif lui répond.

Nombre d'or 2003-10-31

Claude pose la question :
Comment démontrer que si a/b est égal au nombre d'or alors a+b/a est égal aussi au nombre d'or
Comment faut t il choisir a et b pour que le puzzle de lewis caroll soit réalisable? on sait déjà que les nombres 8 et 5 ainsi que 6 et 3 ne sont pas valables.

Claude Tardif lui répond.

Hauteur d'un tétraèdre irrégulier 2003-08-29

Thibault pose la question :
Je cherche à connaître comment calculer la hauteur d'un tétraèdre irrégulier (aucune arêtes égales) en ne connaissant que la longueur des arêtes.
Claude Tardif lui répond.

Opérations de base 2003-07-05

Anne-Marie pose la question :
Je m'appelle Anne-Marie et je suis enseignante de 5e année à l'école Domaine des copains de Balmoral au Nouveau-Brunswick. Récemment, j'ai participé à un concours intitulé: Budweiser King Pack Nascar Hat Promo. Afin de réclamer le prix, qui est une casquette, je devais répondre à une question réglementaire. Il s'agissait d'une phrase mathématique qui se présentait comme suit:

4 x 26 - 24 / 8 = qui se lit: 4 fois 26 moins 24 divisé
par 8
Claude Tardif lui répond.

Fractions 2003-05-10

Jacques pose la question :
Voici la question qu'il pose: 2 x (1/2+1/4) + 3 + 2 x (1/3-1/4). La reponse est 4 2/3. Pourriez m'expliquer etapes par etapes ce que je dois faire.
Claude Tardif et Diane Hanson lui répond.

Soustraction avec les heures 2003-04-08

Jennifer pose la question :
Je m'appelle Jennifer et malheureusement j'ai un petit souci. Pour le calcul des heures c'ets à dire je ne me rappelle plus comment s'effectue une addition ou un soustraction avec les heures comme par exemples 9h45-7h52. Si vous pouviez m'aider j'ens erais trés contente.
Diane Hanson and Claude Tardif lui répond.

Un polyedre convexe 2003-04-07

Hubert pose la question :
quelle sont les conditions nécessaire pour former un polyedre convexe avec un seul type de polygone?
Claude Tardif lui répond.

La somme de 51 nombres entiers consécutifs est 1785 2003-04-01

Katrine et Armand pose la question :
La somme de 51 nombres entiers consécutifs est 1785, quels sont ces nombres? (indication : on rappelle que pour tout entier P, on a 1 + 2 + ....+ P = P (P + 1) / 2).
Claude Tardif et Penny Nom lui répond.

Le terme 2003-04-01

Francine pose la question :
Je suis une enseignante de 5e/6e et j'aimerais savoir comment on traduit le terme "array" en français.
Claude Tardif lui répond.

Nombre Premier 2003-02-24

Un Etudiant pose la question :
Montrer que si p est facteur premier de 2^2ⁿ + 1 alors (p-1) est multiple de 2ⁿ⁺²
Claude Tardif lui répond.

les formules d'aire et de volume de les solides 2003-02-01

Annie pose la question :
Je cherche le nom des mathématiciens qui ont découvert les différentes formules d'aire et de volume de tous les solides ( boule, cube, les prismes, cylindre, cône, pyramide, polyèdres réguliers). Je cherche aussi à trouver comment ils ont démontré l'exactitude de ces formules. L'important, c'est de connaître le nom des mathématiciens qui ont découvert ces formules.
Claude Tardif lui répond.

La longueur d'une corde 2003-01-22

Un eleve pose la question :
Existe-t-il une formule permettant de calculer la longueur d'une corde quelquonque d'un cercle connaissant uniquement le rayon de celui-ci? Si oui quelle est-elle?
Claude Tardif lui répond.

le matricule 2003-01-12

Sirkka pose la question :
"Dans un pays totalitaire, tous les habitants ont un matricule composé de 5 chiffres. Les policiers se reconnaissent au fait que le premier chiffre de leur matricule est strictement supérieur à la somme des quatre autres. ex: 90124 9>0+1+2+4=7 Combien y a-t-il (au plus) de policiers?"
Claude Tardif lui répond.

des conversions de bases différentes 2003-01-04

Christian pose la question :
Je cherche désespérément la (les) règle(s) pour réussir des conversions de bases différentes : de base x vers base y.
Claude Tardif lui répond.

Un peu de trigonométrie 2002-12-16

Hubert pose la question :
J'ai 37 ans et les mathématiques sont relativement loin dans ma mémoire, je voudrais savoir s'il existe un méthode pour résoudre une équation du type. a1*cos(x) + a2*sin(x) + a3*cos(2x) + a4*sin(2x) + a5 = 0
Claude Tardif lui répond.

Volume d'une calotte ellipsoidale 2002-12-11

Fabien pose la question :
Quel est le volume d'une calotte d'ellipsoide de hauteur h (ellipse de longueurs d'axes a, b, et c)? Je souhaite une formule exacte, un développement limité, voire une intégrale à estimer numériquement. Quelle méthode pour le calculer ?
Claude Tardif lui répond.

Une plantation d'arbres 2002-12-10

Eric pose la question :
créer une plantation d'arbres de 6 rangées de 5 arbres, pour un total de 15 arbres . Je n'arrive pas à trouver la forme géométrique.Merci de me répondre que j'ai l'air moins bête envers mon gamin.
Claude Tardif lui répond.

Un exposant negatif 2002-11-25

Vinny pose la question :
Moi je n'ai aucune idée de ce que vaut un exposant negatif com 3^(-5) ou encore 3^(-4/3)
de meme pour un exposant rationnel 3^(4/3)

Claude Tardif lui répond.

Quatre vingts 2002-11-18

Jacques pose la question :
pourqoui les Francais disent quatre vingts pour 80
Claude Tardif lui répond.

100 centimètres 2002-11-13

Un élève pose la question :
je voudrais savoir la contenance de 100 centimètres cube en litre?
Diane Hanson lui répond.

Les unités linéaires 2002-11-12

Sandy pose la question :
je me demande qu'est ce qu'une unité linéaire, mesures de surface et des mesures de volume. je voudrais aussi savoir quelle est la règle de transformation pour les unités linéaires, les mesures de surface et les mesures de volume
Claude Tardif lui répond.

Un triangle équilatéral 2002-10-27

Un eleve pose la question :
Soit ABC un triangle équilatéral construit dans le sens direct. Le point D est symétrique de A par rapport à la droite (BC), et le point E est symétrique de B par rapport au point C. L'intersection des droites (AD) et (BC)est notée H. On pose AB=a.

Je dois calculer les longueurs AD et AE en fonction de a.

Je dois montrer que le triangle ADE est équilatéral. J'arrive a prouver qu'il est isocèle en E mais j'aimerai trouver que AD=DE.

Claude Tardif lui répond.

La limite de (x(n)) 2002-10-01

Une étudiante pose la question :
3) Soit L, le point ayant pour abscisse la limite de (x(n))
a) Exprimer la distance M(n)L en fonction de n

b) Déterminer le plus petit entier naturel n(o) pour lequel la distance Mn(o)L est inférieur à 0,01

c) Justifier alors qu'à partir du rang n(o), tous les points M(n) sont situés dans le segment de centre L et de rayon 0,0 1

Claude Tardif lui répond.

Comment fait on pour justifier que... 2002-09-30

Lucie pose la question :
Comment fait on pour justifier que p au carré est égal à 2 fois q au carré?
Claude Tardif lui répond.

3 maisons 2002-08-23

Wilfrid pose la question :
voila j'ai une petite énigme a vous proposez il y a 3 maisons chaque maisons doit être reliées par une arrivées d'eau , d'électricité et par le gaz sans que les lignes ne se croisses pouvez vous me dire si c'est possible car moi j'ai essayé et ne suis pas arrivé je vous joint un exemple pour que vous compreniez mieux merci d'avance
Claude Tardif lui répond.

Espaces vectoriels 2002-08-18

Bacar pose la question :
Comment montrer que trois (ou plus que trois) sous espaces vectoriels sont en somme directe.
Claude Tardif lui répond.

Un hectolitre 2002-06-12

Un eleve pose la question :
Pouvez-vous me dire combien d'hectolitres y a t-il dans un mètre cube (m3)?
Diane Hanson lui répond.

La traduction anglais 2002-05-27

Une etudiant pose la question :
je voudrais savoir la traduction anglais de :

homothétie (mot de niveau intermédiaire (6-9))
apothème (mot de niveau internédiaire (6-9))

parce que je ne les trouve pas.
Chris Fisher at Claude Tardif lui répond.

Un problème mathématique 2002-04-23

Mylène pose la question :
En me servant de ces chiffres 1 2 3 4 5 6 je dois les utiliser seulement qu'une fois en faisant l'équation suivante.
? X ? X ? __ __ ? ? X ? = 2

Claude Tardif lui répond.

Un empilement de spheres 2002-04-16

Sébastien pose la question :
Lorsque j'etais encore a l'universite je me souviens qu'un prof nous avez dit, sans le demontrer (ce n'est pas bien du tout de sa part) que l'espace minimal qui existe dans un empilement de spheres est de l'ordre de 26% Voici plusieurs jours que je cherche a resoudre ce probleme de geometrie, et je n'arrive meme pas a trouver comment l'aborder.
Claude Tardif lui répond.

Nombres algebriques sur Q 2002-04-11

Un eleve pose la question :
On sait que le corps des nombres algebriques sur Q est algebriquement clos. A priori partant d'un polynome f a coefficients algebriques sur Q on devrait pouvoir un trouver un polynome g a coefficients rationnels dont une partie des racines est constituee de racines du premier. y-at-il un algorithme qui permet qui permet le passage de f a g ?
Claude Tardif lui répond.

Problème de traduction 2002-04-11

Philippe pose la question :
Je suis professeur de mathématiques en collège et j'aimerai que la classe de 5ème, qui a une spécialité "Anglais", fasse un cours de mathématiques en anglais. N'étant pas moi même trés fort en mathématiques version anglaises, je vous sollicite donc pour répondre à certaines de mes questions.
Par exemple, je me demande comment on dit " 3 fois 5" en anglais. "2 plus 2" se dit "2 and 2 is...". J'ai des problèmes avec la multiplication, la soustraction (" minus" ou "out of" ?), et la division. De même , comment dit-on "2/3". J'ai aussi des problèmes pour le vocabulaire mais je pense pouvoir le résoudre en utilisant un bon dictionnaire.

Ma question est donc: Existe-t-il des sites qui propose ce genre de traduction?

Claude Tardif lui répond.

Conversion de m2 en cm2 2002-03-10

Carole et Francis pose la question :
Mon enfant est en 6ième année, il avait le problème suivant à faire dans un test:

Trouve l'aire d'un rectangle mesurant 9 m par 4 m; donne ta réponse en m² et en cm²?

Voici la solution de mon fils:

9m x 4m = 36m²

9m = 900cm 4m = 400cm

donc 900cm x 400cm = 360 000cm²

D'après moi sa réponse est bonne, j'aimerais avoir une confirmation puisque l'enseignante lui dit qu'il y a erreur.

Claude Tardif lui répond.

Les quantités d'aliments 2002-03-09

Benhacine pose la question :
soient les aliments A1, A2, A3.....An contenant respectivement le nutriment "a" aux quantités a1, a2, a3, et an sachant qu'un organisme a besoin d'une quantité connue de nutriment "a" égale à "Be",
Ayant: A1.a1 + A2.a2 +.....+ An.an = 100.Be

et

A1 + A2 + A3 +....+ An = 100

Quelles seront les quantités d'aliments A1, A2, et An qui satisferont le besoin défini "Be" de l'organisme?

Claude Tardif lui répond.

A/B = C/D 2002-03-06

Un eleve pose la question :
Démontrer que si A sur B et = à C sur D, alors AxD et = à BxC.
Claude tardin lui répond.

Une autre bille de rayon différent 2002-02-27

Sarah pose la question :
une bille de 6 cm repose au fond d'1 cylindre droit dont la base est un disque de rayon 10 cm. On verse de l'eau dans le cylindre de façon à recouvrir exactement la bille. Démontrez que l'on peut remplacer la bille par une autre bille de rayon différent (mais supérieur) de sorte que l'eau initialement versée recouvre exactement cette nouvelle bille
Claude Tardif lui répond.

Ses points de discontinuités est les irrationnelles 2002-01-08

Un eleve pose la question :
Je voudrait montrer qu'il n'existe pas de fonction de R--->R tels que ses points de discontinuités est les irrationnelles, en utilisant la methode de "baire".
Claude Tardif lui répond.

Fraction rationnelle 2001-12-11

Audrey pose la question :
réduire en une seule fraction et simplifier.

(4-2x+x²)/(2+x) - (x+2)
Claude Tardif lui répond.

l'équation d'une rotation dans un graphique cartésien 2001-11-14

Ghaith pose la question :
je d6sir que vous me rafraichissez un peu la mémoire s.v.p. j'aimerai savoir l'équation d'une rotation dans un graphique cartésien merci
Claude Tardif lui répond.

Minesweeper 2001-10-24

Un eleve pose la question :
J'espere que vous pourrez m'aider. Est ce que vous connaissez un algorithme ou une strategie de resoulutiom pour le jeu du demineur (8x8 avec 10 mines)(Minesweeper).
Claude Tardif lui répond.

Un nombre entier relatif ou reel 2001-06-13

Omar pose la question :
J'aimerais savoir c'est quoi un nombre entier relatif ou réel?
Claude Tardif lui répond.

Les tableaux de conversions 2001-05-03

Jean-Jacques pose la question :
Sur quel site est il possible de trouver tous les tableaux de conversions de mètres,kg,litre,m2,m3
Quelle est la relation entre les m³ et les litres 1 m³ = 1000 litres = 1000 kg?

Claude Tardif lui répond.

coercif 2001-04-17

Sonia pose la question :
J'ai juste une petite question de vocabulaire à vous soumettre: connaitriez vous la traduction en anglais du mot : "coercif", que je n'arrive pas à trouver sur le net!
Claude Tardif lui répond.

Les dimensions d'un rectangle 2001-04-09

Un elévè pose la question :
1. Les dimensions d'un rectangle sont a et b Si on augmente a de 3cm et b de 2cm, l'aire du rectangle augmente de 37 cm², mais si on diminue a de 2cm et b de 1cm, l'aire du rectangle diminue de 16cm². Quelles sont les valeurs de a et b?
2. Quelle est la valeur numerique de l'expression (ac+bd)+(ad-bc) sachant que a+b=1 et que c+d=1? Quelles sont les regles essentielles qui me manquent pour resoudre ceci?

Claude Tardif lui répond.

preuve par 9 2001-04-04

Michel pose la question :
Pourriez-vous m'expliquer en détail comment fonctionne la preuve par 9 (pour une division et une multiplication). Je sais l'appliquer mais je ne sais pas pourquoi ça marche. Je ne retrouve pas la démonstration. Merci de m'aider. Exemple . 17x2=34 ; preuve par neuf : 1+7=8 ; 8x2= 16 ; 1+6=7 et 3+4=7, on peut donc supposer (sans affirmer) que cette multiplication a un résultat juste car la preuve par 9 est bonne, 7=7. Comment fonctionne cette preuve par 9???
Claude Tardif lui répond.

Le volume d'un ellipsoïde 2001-03-17

Lise pose la question :
Je cherche à calculer le volume d'un ovoide, avez-vous une formule?
Claude Tardif lui répond.

Recherhce sur pi et exponentielle 2001-03-17

Cyril pose la question :
étudiant a la fac de sciences de montpellier je cherche des informations concernant la demonstration suivante: "comment prouver que pi et exponentielle sont irrationnels?"
Claude Tardif lui répond.

Zero 2001-03-15

Alexandre pose la question :
j'aimerais beaucoup savoir si le chiffre zéro est considéré comme étant soit:

pair

impair

pair et impair à la fois

ni pair ni impair.

Claude Tardif lui répond.

Solides 2001-02-26

Joanie pose la question :
J'ai présentement un projet à faire, je dois le remettre avant vendredi.
Je dois trouver entre 31 ou 35 solides: prismes et pyramides

J'ai a donner : le nom de chaque solide; son dessin; et le dessin de chaque solide décomposé en toute ses parties.

Claude Tardif lui répond.

Un lièvre et un chien 2001-02-20

Ganay Alain pose la question :
Un lièvre à 9 sauts d'avance sur un chien. 7 sauts du chien égalent 11 sauts de lièvre. Quand le chien fait 4 sauts , le lièvre en fait 6. En combien de sauts le chien prend-il le lièvre?
Claude Tardif lui répond.

Boulier 2001-02-13

Un élève pose la question :
Comment se sert-on d'un boulier (non asiatique) comportant 10 rangées de 10 boules chacune?
Claude Tardif lui répond.

Radical de n 2001-01-03

Un eleve pose la question :
j'aimerai savoir ( d.Levy), élève de 1éS ce que signifie la phrase: radical de 2 + radical de 3 est un nombre négatif ( niveau intérmédiaire).
Claude Tardif lui répond.

Calculer la hauteur de chute de cette pierre 2000-12-16

Marcus pose la question :
Une pierre tombe au fond d'un puit, à 5 secondes on entend un son (de la pierre). Calculer la hauteur de chute de cette pierre en tenant compte de la vitesse du son = 340m.s^-1
Il faut savoir que pour la chute libre v= g.t ; h = 1/2 g.t² ; v = 2g.h

g intensité du champs de pesanteur = 10 ; h hauteur de chute.

Claude tardif lui répond.

racine carrée 2000-11-24

G. Bigorgne pose la question :
Quel est donc l'origine de l'expression "racine carrée" ? Pourquoi avoir choisi cette expression ?
Claude Tardif lui répond.

Le volume d'une sphère 2000-09-17

Pitmill pose la question :
merci de me donner la formule pour trouver le volume d'une sphère.
Harley Weston lui répond.

isomorphisme 2000-08-10

Romain Kroes pose la question :
Pour les beoins d'un ouvrage d'économie que je suis en train de terminer, pouvez-vous me dire qui est (sont) l'inventeur de l' "isomorphisme" en mathématiques (calcul tensoriel)?
Claude Tardif lui répond.

Un polyedre ayant comme face 20 triangles 2000-08-02

Sonia pose la question :
J'aimerai savoir comment s'appelle un polyedre ayant comme face 20 triangles équilatéraux égaux.
Chris Fisher lui répond.

Exposant à la 0 2000-07-04

Sylvie pose la question :
J'aimerais savoir combien fait 0 exposant 0.
Claude Tardif lui répond.

Combien y aura t il de 9 dans la réponse? 2000-06-17

Marie pose la question :
J'ai lu une énigme mais je n'ai pas la réponse."si l'on divise 123 456 789 par 999 999 999, combien y aura t il de 9 dans la réponse?"
Claude Tardif lui répond.

le nombre d'or 2000-06-14

Belhaj Saad pose la question :
quel est le nombre d'or?
Claude Tardif lui répond.

Sens d'un mot 2000-06-01

Edward Brisse pose la question :
Serait-il possible de connaître le sens précis du mot "PORISME". Exemple : "le porisme de Poncelet".
Claude Tradif lui répond.

la dimension fractale 2000-05-01

François RIVOIRE, Julien CHOLLET et Alexandre DECOSTER pose la question :
nous sommes étudiants en première année MPSI en école d'ingénieur ISEN ( Institut supérieur d'électronique du Nord ). Nous avons choisi les FRACTALES ( ou plus précisément sur la dimension fractale et topologique ainsi que sur les suites logistiques) comme sujet de TIPE; serait-il possible que vous nous envoyez des démonstrations mathématiques ou des conseils car jusqu'ici nous avons eût beaucoup de mal à trouver des démonstrations se rapportant à ce sujet,
Claude Tardif lui répond.

Resolution of the equation f(x)=0 2000-04-01

Naoufal pose la question :
How can i evalf the equation f(x)=0 with f function . Can you ansear me in french thank you very much
Claude Tardif lui répond.

Explications 2000-03-05

Jean Barbe pose la question :
Comment expliquer l'algèbre à un adolescent du Sec. 111
Claude Tardif lui répond.

Point de partage 2000-02-21

Sebastian Murciano pose la question :
J'aurais besoin de savoir où je peux trouver de l'informations, ou est-ce que vous pouvez me donner de l'information sur : Point de partage d'un segment étudié en Secondaire 4.
Claude Tardif lui répond.

La bissectrice de l'angle ABC 2000-02-16

Laurent Gauthier pose la question :
Est-ce redondant d'ecrire "angle ABC" avec un accent circonflexe sur le B? Peut-on ou devrait-on se contenter d'ecrire soit ABC (avec l'accent), soit l'angle ABC (sans accent) ? Le contexte dans lequel ceci apparait est le syntagme "la bissectrice de l'angle ABC", c'est-a-dire que je me demande si on devrait ecrire "la bissectrice ABC " (avec accent), "la bissectrice de l'angle ABC" (sans accent) ou "la bissectrice de l'angle ABC" (avec accent).
Claude Tardif lui répond.

Septante 1999-12-18

Guillaume Bessis pose la question :
Pourqoui et depuis quand en France emploie-t-on l'expression 'soixante-dix' et non septante pour désigner 70 ? (idem pour 90 et nonante)
Claude Tardif lui répond.

Les equations 1999-12-09

Enciso Alberto pose la question :
j'ai les equations suivantes:
X1=Rs + A1/(B+W^2)
X2=Rs + A2/(B+W^2)
X3=Rd + A3/(B+W^2)
X4=Rd + A4/(B+W^2)
X5=Rg + A5/(B+W^2)
X6=Rg + A6/(B+W^2)
dont les coefficients Ai (i=1,2,..) et B sont constants (mais on ne conais pas leur valeur) et Rs, Rd, et Rg sont inconnues. Nous pouvons constater que la dependence de ces differentes expessions en fonction de W^2 est identique. Le tracé de l'une de ces expressions en fonction d'une autre est donc une driote.
.
.
.
Claude Tardif lui répond.

ln(x+3)+ln(x+2)=ln(x+11) 1999-11-24

Thibault Portevin pose la question :
"Résolvez l'équation : ln(x+3)+ln(x+2)=ln(x+11)" Je suis bloqué, pourriez-vous m'aider?
Claude Tardif lui répond.

la pantographie 1999-11-18

Erick et Christine pose la question :
Nous recherchons la définition de pantographie voltaïque, que représente cette "figure" ? est-ce qu'on peut en définir une unité de mesure ?
Claude Tardif lui répond.

logarithme neperien 1999-11-10

Louise Kieffer pose la question :
D'où provient la valeur e ( 2,7....) des logarithmes népériens ?
Claude Tardif lui répond.

15 films 1999-11-09

Hebert pose la question :
Un touriste revient de vacnces avec 15 films:

2 films de photos d 'Italie
8 films de photos de Grèce
5 films de photos de Turquie.
Aucune marque distinctive ne permet d'identifier les films. Pour des raisons financières le touriste ne fait développer à son retour que 11 de ces 15 films qu'il choisit au hasard.NB : on donnera les résultats sous forme décimale approchée à 10-4 près.

Combien y a t il de choix différents possibles de 11 films parmi les 15 ?
Quelle est la probabilité que , parmi les 11 films développés, il y ait:
...

Claude Tardif lui répond.

Gravity equation 1999-10-21

Jean-Marie Le Ray pose la question :
J'ai dû traduire un texte avec la formule "gravity equation", que j'ai rendue par "équation de gravité", sans absolument savoir de quoi il s'agit. Quelqu'un sait-il si cela est juste et ce qu'est exactement une "gravity equation"?
Claude Tardif lui répond.

Derivées partielle 1999-10-19

Arnaud Flandin pose la question :
Quel est la definition des derivées partielle
Claude Tardif lui répond.

La longueur des segments formant un triangle 1999-10-05

Michel Provencher pose la question :
Connaissant la longueur des segments formant un triangle,comment détermine-t-on chacun de ses angles si:

il S'agit d'un triangle rectangle
Sachant que la somme des angles d'un triangle est de 180 degrés et sachant par conséquant qu'un des angle est de 90 degrés (triangle rectangle) il reste donc, 90 degrés à partager entre les 2 angles restant. Si les 2 segments formant l'angle droit sont de même longueur on obtient un angle de 45 degrés pour les angles restant soit 1/2 angle droit ce qui ne me pose évidement aucun problème. Quel relation, S'il y en a une, y a t-il entre la longueur de ces 2 segments et les angles restants.

il S'agit d'un triangle quelconque

Claude Tardif lui répond.

Application surjective 1999-09-30

Charass pose la question :
je suis étudiant en premiere année de deug et je cherche apres une definition si vous pouviez m'aider, ça serait sympa. qu'est ce qu une application subjective?
Claude Tardif lui répond.

Traduction 1999-09-27

Beatrice pose la question :
Pouvez-vous me traduire en anglais les terms ci-dessous?

Intrégration ensembliste
Espaces vectoriels normés
Traitement statistique du signal
Equations aux dérivées partielles
...

Claude Tardif lui répond.

Le salinon d'Archimèdre 1999-03-11

Don Craig pose la question :
I am trying to find the English translation of "Le salinon d'Archimèdre" and would appreciate any help. This is a figure, presumably studied by Archimedes, created from 4 semi-circles. Since I can't draw it for you, I will try to describe it with the help of the 5 collinear, horizontal points below.

. . . . . A B C D E

A semi-circle is constructed on AE as diameter (let's say above AE).
Two more semi-circles are then constructed with diameters AB and DE on the same side of the line AE as the first semi-circle (above it). Finally, a fourth semi-circle is constructed on diameter BD, this time on the opposite side of the line AE from the others (i.e. below the line).
These semi-circles and the region enclosed by them constitute what is called in French "Le salinon d'Archimèdre".
If you know the English name of this curve I would appreciate it if you let me know.
Harley Weston lui répond.

Maths 1999-01-11

Stephane Roissard pose la question :
Soit ABC un triangle dans lequel les trois médianes sont de meme longueur. Montrer que ce triangle est quilatéral.
Jack LeSage lui répond.

Le sang humain 1998-10-06

Golden pose la question :
Le sang humain contient approximativement 2,5 x globules rouges. Chaque globule a un rayon de 0,004 mm. Si on le place ces globules bout a bout, quelle est la longeur de la chaine en millimetres? En kilometres? Compare toi avec la circonference de la terre (24 000 km) (Travail avec exposants)
Claude Tradif lui répond.

Un angle solide 1998-05-06

Giol pose la question :
Qu'est ce qu'un angle solide ?? J'ai beau chercher dans mes documents, je ne trouve rien de bien convaincant sur le sujet si ce n'est une définition qui me semble bien vague et creuse ... En vous remerciant de votre attention ( puissiez vous illustrer votre réponse par un exemple, s.v.p...)
Bonjour,

Chris Fisher lui répond.

les fractions 1998-02-24

Colette Huguenin pose la question :
Bonjour je révise mes math de tout les secondaire et le livre louer la bibliothèque n'est pas entier voici le genre de problêmes qui me bloque
(5 4/5+1/2)divisé 1/3
je sais que je dois commencer par la parenthèse mais...je fait quoi comme opération avec le 5? dois-je le multiplier ou l'additionner ou.......????? si je pouvais seulement avoir la base des fractions je redébloquerais surement
Diane Hanson lui répond.

Volume tetraedre 1998-02-13

Solecki Yannick pose la question :
j`aimerais savoir s`il existe une formule de calcul simplifie pour trouver le volume du tetraedre en fonction de ses cotes et sans utiliser une expression matricielle.
Chris Fisher lui répond.

Question de trigonométrie 1997-12-11

Jean-Pierre Quesnel pose la question :
Je suis dans le désert et je parcours 1000 km à partir du point "A" jusqu'au point "B". Si je reviens au point "A" et fais une rotation de 8 degrés en faisant un autre 1000 km, quelle sera la distance en km entre les points "B" et "C".
Diane Hanson et Penny Nom lui répond.

The area of a lot 2022-12-31

Brian pose la question :
To calculate lot size, do you use arc length or chord length? Lot Survey shows: Length 1 = 120.0' Length 2 = 120.0' Width 1 = 61.0' Width 2 = ARC Length 125.58' / CHORD Length 124.10' / Radius = 236.0'
Harley lui répond.

A lock combination 2022-07-19

Kendal pose la question :
If I tried I could probably (I think) figure the answer but it would take a minute and I hoped maybe as math people there may be a simple formula… I just watched a new movie Black Phone, the kid is given 5 numbers for a combination lock in order but with no indication where the stops are. The numbers (in order) are 23317, my question is how many possibilities with a standard combination lock are there…ie. 2-33-17, 23-3-17, 23-31-7…. As you can imagine not a great movie…my curiosity may get the best of me depending on how your app works ;). Thanks for your time.
Penny Nom lui répond.

Strings of letters 2022-04-25

Javar pose la question :
How many different combinations can I make with A 12 selection list but only using A&B

Example:

A,B,A,B,A,B,A,B,A,B,A,B
A,B,B,A,A,B,B,A,A,B,B,A
B,B,A,A,B,A,B,A,B,A,A,B
penny Nom lui répond.

The length of a line at 45 degrees 2022-04-09

Aiden pose la question :
Let's say one line is diagonal and one line is vertical. If they eventually meet at a 45 Degree angle, How long will the diagonal line be compared to the vertical line? (For Example: If The Vertical Line is Exactly 1 Inch.
penny Nom lui répond.

sec(pi/12) 2022-03-23

Diana pose la question :
Please help me find the exact value of the following trigonometric expression: sec(pi/12). Thanks!
Harley Weston lui répond.

A word problem 2022-01-29

Ric pose la question :
Box of oranges weighs 9 pounds. 2/3 of oranges eaten. Box and remaining oranges weighs 4 pounds. What is weight of box when empty?
Penny Nom lui répond.

The next rational number 2022-01-14

Sophia pose la question :
what comes after 3 1/2?
Penny Nom lui répond.

A graph with 100 vertices and one edge 2022-01-11

Maftuna pose la question :
A graph has 100 vertices and only one edge. How many connected components does it have?
Penny Nom lui répond.

A Word Problem 2021-12-17

Bryson pose la question :
Yolanda, Brian, and Charlie have a total of in their wallets. Brian has less than Yolanda. Charlie has times what Brian has. How much do they have in their wallets?
Penny Nom lui répond.

The height of a right triangle 2021-12-15

Slash pose la question :
hi how can i find the height of a triangle from the hypotenuse and base. please go into some details with some steps because it is hard to understand. thanks
Penny Nom lui répond.

Simplifying a complex expression 2021-12-15

Grace pose la question :
Write in the form. a+bi, -6-7i+8i^2+4i3-5i^4
Penny Nom lui répond.

Roll of film 2021-11-20

Brian pose la question :
Trying to create a formula to calculate the build up on a roll of film is calculated. Except instead of of a roll, it's essentially a rectangle with two semicircles on each at the end. Example: I start with a 6" diameter core on each side, and I start winding .005" thick film on the core. The distance between the center of those cores, length of the inner rectangle is 7.125. If I continue to do this for a total length of film of 3000 feet, what will the roll length and width be. So what I need is the formula to perform this type of calculation. Can you help me? I want to be able to plug the formula in a spread sheet and to be able to input a core diameter, a film thickness and a total length and the length between the center of the two cores(which is the inner rectangle's length I'm assuming). Thanks
Harley Weston lui répond.

The sides of a 5-pointed star inscribed in a circle 2021-09-18

Scott pose la question :
Is there a calculation for the length of each side of a five-pointed star? I am not worried about area but if I have a circle with a 7.5 foot radius and place a star inside it, how can I measure the lines creating the star?
Harley Weston lui répond.

The dimensions of a rectangle 2021-09-09

Ash pose la question :
I need to know how to figure out the dimensions of a rectangle. I know that the area is 30ft and the perimeter is 26ft. I'm 15 and I have no idea what I'm supposed to do.
Harley Weston lui répond.

30 % off 2021-09-07

Corrine pose la question :
When I am shopping for clothing that is for sale, the advertisement may say the item is 30% off. The original price was $70. How much would it now be? (how do I figure that out?) Thank you!
Penny Nom lui répond.

The units digit of a square 2021-09-04

Aarzu pose la question :
Sorry this may be a dumb question but how do you find possible unit digits of a perfect square
Penny Nom lui répond.

An arithmetic and a geometric sequence 2021-08-29

Moti pose la question :
Let {an} be an arithmetic sequence such that its 1st, 20th, and 58th terms are consecutive terms of some geometric sequence. Find the common ratio of the geometric sequence.
Harley Weston lui répond.

Fibonacci numbers 2021-08-25

John pose la question :
Make a single column of numbers. Start with two numbers of your choice. The third number is the sum of the previous two, the fourth number is the sum of numbers two and three, and so on until you have ten numbers in the column. Add up all ten numbers. Now, take the seventh number and multiply it by eleven. This product will equal the sum of the ten numbers. The same result will occur regardless of the first two numbers chosen. The question is why does the 7th number multiplied by 11 always equal the sum of the ten numbers?
Penny Nom lui répond.

A word problem 2021-07-28

Isaac pose la question :
The average mass of a group of children is 50 kilograms. Todd, who has a mass of 62 kilograms, then joins the group. This raises the average mass of the group to 52 kilograms. How many children were in the original group
Penny Nom lui répond.

New pool liner 2021-07-14

Kareena pose la question :
I have a rectangular prism shaped pond that are 4ft by 8ft by 2ft. My pond is lined on the sides and bottom with a pool liner so that it doesn't leak (the top of the pool does NOT have a liner). I am redoing my pool and would like to increase the size of the pond. Each dimension will increase by the same amount, and the size of the pool liner will double. How much I am increasing each dimension of the pond? Give an exact answer and than an approx. answer rounded to the nearest tenth.
Penny Nom lui répond.

How many ways can you travel from A to D? 2021-07-02

shawn pose la question :
Hello, I am trying to solve a problem which is how many ways can you travel from A to D. A has 4 options b has 3, C and you get to D. How many ways are there?
Penny Nom lui répond.

3.1 miles in 4 minutes 2021-06-21

Jean pose la question :
I am a school bus driver. My route directions and time schedule have me traveling 3.1 miles in 4 minutes. How fast do "they" expect me to drive to accomplish this? Thank You
Penny Nom lui répond.

UFO speed in MPH from nearest galaxy in one year 2021-05-22

Joe pose la question :
If the next closest galaxy is 15 quadrillion miles away and there are 8760 hours in one year; how fast would a UFO have to fly to travel from the next galaxy, in MPH in one year ?
Google calculator gives this result: 1.7123288e+12
I don't understand what the "e+12" means.
How is that pronounced, ex. trillion, quadrillion etc..?

Harley lui répond.

The diameter of an octagon 2021-05-22

Sue pose la question :
What is the diameter of an octagon with 8 foot sides
Penny Nom lui répond.

The height of a cone 2021-05-13

Carmen pose la question :
If a cone has a slant height of 25 inches and a radius of 7 inches what is the height in inches of the cone?
Harley Weston lui répond.

2.5 percent of 1.5 billion 2021-05-13

Anish pose la question :
What is the 2.5 percent of 1.5 billion?
please state if there are any general formulae of this calculation.

Thank you
Penny Nom lui répond.

An octagonal drum 2021-05-11

Louie pose la question :
I teach carpentry on an Indian reservation.
My students want to make an 18 inch drum frame.
They want to have 8 sides or an octagon shape to the drum frame.
What angle I have to set my miter saw to cut the angles to fit the octagon together.
I want to use this formula by changing the diameter of the frame.

Harley Weston lui répond.

More on a roll of paper 2021-05-07

Stephen pose la question :
Can you help with the equations to calculate the length of paper required to achieve a target outside diameter when wrapped around a core please?

The inside diameter of the cardboard core is 76mm
The thickness of the wall of the cardboard core is 5mm
The thickness of the paper is 138microns
The desired outside diameter of the finished roll is 320mm

I hope you can help me with a solution, Thank you
Harley Weston lui répond.

Word problem 2021-05-07

Donelle pose la question :
Freddy is three times as old as Mary. Mary is twice as old as Jack. Jack is 11 years old. How old is Freddy?
Penny Nom lui répond.

The maximum area of a garden 2021-04-28

Lexie pose la question :
suppose you want to make a rectangular garden with the perimeter of 24 meters. What's the greatest the area could be and what are the dimensions?
Penny Nom lui répond.

The volume of a spherical bowl 2021-04-23

Danny pose la question :
How many gallons of water in a glass bowl with the dimensions of 10 inches high and 13.5 inches wide?
Penny Nom lui répond.

Rates & Ratios 2021-04-11

Kenneth pose la question :
Is it correct to think that a rate can have units that are the same? Usually rates have units that are different to each other.
Penny Nom lui répond.

Four friends in a race 2021-04-06

Angel pose la question :
Four friends ran a race:
Ben finished seven seconds ahead of Mike.
Noel finished three seconds behind Sam.
Mike finished five seconds behind Noel.
What will be the formula to support their place?
Penny Nom lui répond.

Time, distance and rate 2021-03-10

Zander pose la question :
A lady drives 180km from her wine farm to Ceres. On her return (at night) she drove 30km/h slower. Her return takes one hour longer. At what speed did she drive home?
Penny Nom lui répond.

Bearing and distance 2021-02-22

bahlqees pose la question :
A girl starts from a point X and walks 220m on a bearing 063°.she then walks to a point Y on a bearing 156°.if Y is due east of X,calculate|XY| solve and draw the diagram please
Harley Weston lui répond.

Scale drawing 2021-02-10

Elias pose la question :
a football field is 160m long and 120m wide . Find the distance between its opposite corner flag posts . use the scale of 1cm:20m
Penny Nom lui répond.

Division in different bases 2021-02-06

Promise pose la question :
Simplify the following 302 in base6 divided by 5 in base6
Penny Nom lui répond.

Multiplying and adding two numbers 2021-02-06

Yvonne pose la question :
Two numbers multiplied to get -13 and added to get -12
Harley Weston lui répond.

Simplify 2021-02-05

Leslie pose la question :
To simplify improper fractions, do you convert it to a mixed number or leave as an improper fraction?
My daughter had a quiz in which she was supposed to simplify her answers. So, for example, on one question the answer she got was 11/10 and on another question she came up with 17/12. The teacher marked these as incorrect because they were mixed numbers. Her teacher wrote on her paper, "**name**, I even gave this back to you and told you to go through and simplify your answers!" We (her father and I) feel that the teacher wanted her to convert her answers, not simplify them but I haven't been able to find a definitive answer online. So, does simplifying improper fractions mean converting them to mixed numbers? Thank you for your help!

Penny Nom lui répond.

A scale factor 2021-02-02

Layla pose la question :
Beth planned to travel from Battery Park to Times Square. The distance between the two places is 2.48 inches on the map of New York City. If the scale factor used for the map was 1 mile = 0.4 inch, find the actual distance between the two tourist attractions.
Penny Nom lui répond.

Arranging chairs in a row 2021-01-26

aiyana pose la question :
hi i need help with this a teacher wants to arrange 16 chairs in a equal rows in his class room
Harley Weston lui répond.

A scrambled word 2021-01-19

john pose la question :
How many ways can you scramble the work "0axaca" if two a's must never be adjacent?
Penny Nom lui répond.

A scenario for a linear equation 2021-01-19

raven pose la question :
I have to create a scenario for the following equation y=-1x+45 and then find what each part of the equation represents
Penny Nom lui répond.

Velocity and acceleration 2021-01-09

yen pose la question :
The motion of a stone projected upward is given by the relation s=112t - 16t^2. What are the values of velocity and acceleration when t=3 sec?
Penny Nom lui répond.

A 2.5 acre square 2021-01-09

hannah pose la question :
how many feet of fence needed to fence a square 2.5 acres??
Penny Nom lui répond.

10^1,000,000 2020-12-18

G pose la question :
Looking for the name of a really big number. its a 1. with a Million zeroes after it.
Harley Weston lui répond.

0^(a+bi) 2020-12-03

Douglas pose la question :
I realize raising 0^a = 0 if a>0 and undefined if a<=0.

If have read that 0^bi is undefined for all b.

What I don't understand is why 0^(a+bi) = 0 if a and b are not equal to zero.

Is this purely by definition or is there a logical reason why this is the case?
(I have taken Complex Analysis, so have a fairly good understanding of complex numbers.)
Penny Nom lui répond.

Comparing two job offers 2020-11-17

Selena pose la question :
Raja has been offered two jobs.
Each of these jobs takes 24 weeks to complete.
One job pays $3440 every 8 weeks. The other job pays $2700 every 6 weeks. Raja wants to accept the job that pays more per week.
Show how to use equations to help Raja make her choice.
Penny Nom lui répond.

The distance between opposite vertices in an octagon 2020-11-14

joe pose la question :
If the dimension from one flat part of an octagon to opposite flat is 500 mm what is the largest diameter (point to point) of the octagon?
Harley Weston lui répond.

Golf for 28 golfers over 4 days 2020-11-14

David pose la question :
hi, I was wondering if you could help me with a golf draw, I have 28 players and wish to play a four round foursomes over 4 days
I would like to minimize the amount of games that they play together.
Harley Weston lui répond.

Divisibility by 8 2020-11-10

Sariyah pose la question :
Of the positive integers between 1000 and 10000 that are divisible by 8, how many have a 5 in the hundreds place?
Harley Weston lui répond.

The dimensions of a rectangle 2020-11-02

Chie pose la question :
A rectangular piece of property has an area of 987m² and a perimeter of 136m. Find its LENGTH and WIDTH.
Penny Nom lui répond.

Running around a circular track 2020-10-31

kaylee pose la question :
Keiko and Kendra are training for an international track competition. Kendra is running one lap on the outside of a circular track with a diameter of 1000 feet. Her constant rate of speed is 12 mi/h. Keiko is running one lap on the outside of a nearby circular track with a diameter of 1125 feet. She is also running at 12 mi/h. Find the time, in minutes, each runner needs to complete one lap.
Harley Weston lui répond.

Equivalent fractions 2020-10-31

Lexi pose la question :
Which of the following fractions is equivalent to -84 / -90?
A. -14 / 15
B. -42 / 45
C. 14 / 15
D. 42 / 45
Penny Nom lui répond.

An analytic proof that a quadrilateral is a parallelogram 2020-10-26

Apollo pose la question :
Prove analytically that if ABCD is a parallelogram in which points P and Q trisects the diagonal AC, then BPDQ is a parallelogram.
Penny Nom lui répond.

Two equations with fractions 2020-10-22

mia pose la question :
I am supposed to look for x and y. my teacher didn't explain very well.
please help : ((
2x - y = 5
x/4 + y/3= 2
Penny Nom lui répond.

2xy = 2x*2y 2020-10-22

Amber pose la question :
Um i am wondering what this equation equals. Thank you for your time and help.

2xy=2x*2y
Penny Nom lui répond.

Solving an inequality 2020-10-18

nunya pose la question :
3(4 + 2n) > 2n - 16
Penny Nom lui répond.

A word problem with three variables 2020-10-18

Yesenia pose la question :
Carmen, Austin, and Trey have a total of $128 in their wallets. Trey has $10 more than Carmen. Austin has 4 times what Trey has. How much do they have in their wallets?
Penny Nom lui répond.

A confusing problem 2020-10-01

Kgaugelo pose la question :
a triangle has the vertices A(-4;-3),B(x;y)and C(2;1). Determine the coordinates of B if the equation of the line BC is y=5x-9
Harley Weston lui répond.

A combination lock 2020-09-29

Rourke pose la question :
how many possible combinations are there in a 4 digit lock with 6 numbers which can repeat themselves.
Penny Nom lui répond.

Factoring an interest formula 2020-09-29

Kenneth pose la question :
Hello

P + Pr has a common factor of P so it can be expressed as P(1 + r) after the P is factored out.. How does the "P" get in front of (1 + r)?

P/P + Pr/P = 1 + r What step is used to show that P is added in front of (1 + r)?

I thank you for your reply.
Harley Weston lui répond.

Is -1 an odd integer? 2020-09-27

Nicole pose la question :
is -1 an odd integer?
Penny Nom lui répond.

The height of a tree 2020-09-27

Kerissa pose la question :
A man height 1.2 m standing on top of a building 34.6m high views a tree some distance away he observes that the angle of depression of the base of the tree is 35 and the angle of depression of the top of the tree is 29, assuming that the tree stands of level ground. Determine the height of the tree.
Penny Nom lui répond.

A Parabolic Arch 2020-09-21

Malen pose la question :
A hotel entrance makes a parabolic arch that can be represented by the quadratic function, y= -x^2-8x+24, where y is the height of the arch and x is the distance from wall to wall in the feet. What is the distance between the two walls of the arch.
Harley Weston lui répond.

my prcentage of years on earth is 2020-09-21

Bill pose la question :
This Tuesday is my birthday and I will be 69. and I just wanted to know life ear is say earth is 6 billion years old I'm just curious to what percentage does my existence on earth reptresent I do realize that it's a flash in the pan
Penny Nom lui répond.

A problem involving distance, time, and rate. 2020-09-15

Ruby pose la question :
Amy drove on the highways at 70 miles/hour to pick up fruits from her grandma’s garden in the morning.
She stayed there for two hours. When coming back in the afternoon, she drove on the local roads at 40 miles per hour to avoid traffic.
She spent a total of 8 hours for this trip, and drove a total 300 miles.
How many miles did she drive each way?
Penny Nom lui répond.

The surface area of a dome 2020-09-13

Sue pose la question :
i need to know the outside square footage of a dome house 24ft across at the bottom and 16ft high so i know how much paint it will take to cover it.
Harley Weston lui répond.

9 games with 3 possible outcomes 2020-09-13

Daniel pose la question :
Hi
I’d like to know how many different outcomes would be in a Soccer week played if there is 9 different games 2 teams and 3 outcomes Win, tie or lose

Thank you
Penny Nom lui répond.

Simultaneous equations 2020-09-05

Paa pose la question :
a+b=8
a+c=13
b+d=8
c-d=6
find the value of each letter
Penny Nom lui répond.

Slope 2020-09-04

Mark pose la question :
I'm trying to calculate slope over 157'.I have a drop of 9 1/8 inches. What fraction of an inch of fall do I have every 10 feet
Penny Nom lui répond.

The angular speed of a wheel 2020-09-03

Catrina pose la question :
A car is moving at a rate of 75 miles per hour, and the diameter of its wheels is 2.6 in. Find the angular speed of the wheels in radians per minute.
Penny Nom lui répond.

Bearings 2020-08-30

Tom pose la question :
A boy walks 5km due North and then 4km due East
I. Find the bearing of his current position from his starting point
II. How far is the boy now from the starting point
Penny Nom lui répond.

4 digits to unlock a padlock 2020-08-28

Sophie pose la question :
I have forgotten the order in what the numbers go for my padlock! The numbers are, 0125, they don't have any repeats like, 0001, 0002. What are all possible the combinations? Help!
Penny Nom lui répond.

Arranging buttons in a row 2020-08-24

Nick pose la question :
A sequence of 10 buttons can be arranged in a line. The buttons are identical except for colour, with each button being either red, blue or green.

Arranging buttons in a row How many sequences can be made where there are exactly 2 red buttons as part of the sequence of 10 buttons?

How many sequences can be made where there are exactly 4 red buttons as part of the sequence of 10 buttons?
Penny Nom lui répond.

A diameter of a circle 2020-08-19

Apple pose la question :
One end of the the diameter of the circle with equation x^2+y^2-4x+4y=2 is (3,1). Find the coordinates of the other end of the diameter.
Penny Nom lui répond.

A window problem 2020-08-18

Richard pose la question :
Hello,
I was hoping your math specialists could help me with some formulas. I have shapes with specific known variables need to calculate others.

Example:
We make a straight legged arch, This shape has a width a overall height and a leg height, The leg height is always less then the overall, And the top is arched. We have the width, Height, and leg size.

Need to calculate the length of the curve and sq ft of the shape.
Harley Weston lui répond.

A word problem with no algebra 2020-08-11

Julie pose la question :
At 3pm, Bruce headed north at 30 km/hr. 2 hours later, Lucy headed south at 40 km/hr. At what time will they be 340 km apart
Penny Nom lui répond.

More on the last 2 digits of a^k = N 2020-08-07

Jay pose la question :
I've seen solution methods for finding the last 2 digits of a^k = N, where a and k are known. My question is:

What if the number N is known and the last 2 digits are, say, ...62. Is there a way to find, for any given a, the value of k which will result in a number where the last 2 digits are ...62? and if that is possible, then do the same for a number with the last n digits (say 7 or 53 or something)?
Harley Weston lui répond.

Filling holes with stone dust 2020-07-30

Zach pose la question :
I’m looking for amount of stone dust needed for thirteen holes with a 3ft depth and 12in diameter with a 4x4 post. I would need the measurement in KG.
Harley Weston lui répond.

A tank, 5/9 full of water 2020-07-28

Nat pose la question :
A rectangular tank contains 1200cmsquare of water when it is 5 out of 9 full . Its base area is 80cmsquare . Find the height of the tank.
Penny Nom lui répond.

Five rational numbers between -4 and -3 2020-07-28

Priyanshi pose la question :
Five rational numbers between -4 and 3
Penny Nom lui répond.

x+sin(x) 2020-07-24

adm pose la question :
f(x)=x+sin(x)

to evaluate f(30)

use radians only or degrees
Harley Weston lui répond.

Choosing 4 balls from 9 2020-07-22

sandiso pose la question :
What is the probability associated with each possible random sample of size 4 from the population consisting of these nine balls
Penny Nom lui répond.

why percents can be helpful 2020-07-02

THERESA pose la question :
why percents can be helpful
Penny Nom lui répond.

4sin(2x)cos(2x)+1=0 2020-07-02

Sheila pose la question :
4sin(2x)cos(2x)+1=0
Penny Nom lui répond.

Some strings of 4 digits 2020-06-26

Judy pose la question :
I wrote previously and need more help. I need to generate a list of 4 digit. Numbers using 0-9 with no repetitions
I know that there is a 6 followed by a 2. Order does matter
Thank you in advance for your help.
Penny Nom lui répond.

Scale factor 2020-06-26

Kinza pose la question :
Hi, my question is The perimeter of a triangle is reduced from 75cm to 20cm. What is the linear scale factor?
Penny Nom lui répond.

A word problem involving linear equations 2020-06-22

Allie pose la question :
The length of a rectangular swimming pool is p m and its width is q m. Its given tht the length of the swimming pool is twice its with. if the perimeter of the swimming pool is 150 m, find the values of p and q this is in the chapter linear equations
Penny Nom lui répond.

A word problem with fractions 2020-06-21

Sthantsa pose la question :
I'm stuck with this question, I don't know where to begin because i really don't Know where to start.

Jessie and Thulani each has a sum of money. Jessie’s amount is 2/5 that of Thulani’s. If Thulani were to give Jessie R198, then his remaining amount will be 6/8 that of Jessie’s amount.
How much does Jessie have originally??
Penny Nom lui répond.

1 square cm is 100 square mm 2020-06-19

macie pose la question :
explain why the conversion factor for cm squared to mm squared is 100 ,and not 10
Penny Nom lui répond.

390 as a percentage of 800 2020-06-18

Yug pose la question :
What percentage is 390 grams of 800 grams?
Penny Nom lui répond.

The substitution method 2020-06-10

Hardebolar pose la question :
simultaneous equation by substitution method

.a-b=2/3
a+b=1 2/3
p lui répond.

Working backwards 2020-06-05

Jill pose la question :
Emma has a bunch of grapes (1)/(2 ) of it she gave it to her friend and (3)/(4 ) of the remaining grapes she gave it to Gina. There are 4 grapes remaining. So how many bunch of grapes to begin with?
Harley Weston lui répond.

An octagonal pool deck 2020-05-30

lauchie pose la question :
need help on cut sizes and cut degrees on octagon pool deck for a 24 foot round pool
Harley Weston lui répond.

Percentage profit 2020-05-30

jaheem pose la question :
A shopkeeper buys an article for 80cents and sold it for $1. Calculate the percentage profit.
Penny Nom lui répond.

A hexagonal planter 2020-05-28

Callie pose la question :
Hello, I'm having trouble cutting my angles for my 2 x 4 planter. I did exactly as I've watched and read and mine is just not turning out! Ok, so I want 6 or 8 piece hexagon. With an interior of about 10". So I understand that the boards can be any length, but its the 30 degree or 22 1/2" angles that matter. So. How do I figure how long my 2 x 4 is with 6. and another 8 pieces of 2 x 4 to make this planter and at what angle. So does the length determine the angle? Thank you in advance! i don't want to waste anymore wood! And how to figure length, angle and center circumference?
Harley Weston lui répond.

10 of 24 hours as a percentage 2020-05-27

Larzy pose la question :
what is 10 of 24 hours in percentages
Harley Weston lui répond.

Are all quadrilaterals the same? 2020-05-27

eva pose la question :
are all quadrilaterals the same?
Penny Nom lui répond.

A triangular garden 2020-05-24

yoonji pose la question :
the 3 sides of a triangular garden measure 200 ft., 250 ft., and 300 ft., respectively. the garden is to be divided by a line bisecting the longest side and drawn from the opposite vertex. what is the length of the bisecting line?
Penny Nom lui répond.

A sand castle in the shape of a truncated cone 2020-05-23

Summer pose la question :
A sand castle is in the shape of a truncated cone as shown. Calculate the length of the diameter of the base.
The diameter of the top of the truncated cone is 20cm
The height is 30cm
The slopes are 32cm
Penny Nom lui répond.

A 50:1 ratio in a pint 2020-05-22

Steve pose la question :
How much oil do I need to put in a pint if it's 50:1 ratio
Harley Weston lui répond.

Drawing a counter from 2 bags 2020-05-21

Sephy pose la question :
Question 4: Two bags, 1 and 2, each contain equal size counters.
Bag 1 contains a pink counter, yellow counter and white counter. Bag 2 contains counters labelled 1, 4, 5 and 7.
A counter is drawn at random from bag 1 and a counter is drawn at random from bag 2.
If the counter from bag 1 is pink, the number on the counter from bag 2 is increased by 1
If the counter from bag 1 is yellow, the number on the counter from bag 2 is decreased by 5
If the counter from bag 1 is white, the number is halved.
Find the probability of scoring a number below 3
Penny Nom lui répond.

Forming the largest cylinder 2020-05-20

Amanda pose la question :
How do I find the maximum surface area and volume of a cylinder made up of ONE 8.5x11 piece of paper?
Penny Nom lui répond.

Maximizing the volume of a cone 2020-05-18

Ella pose la question :
Hello, this is question - 'If you take a circle with a radius of 42cm and cut a sector from it, the remaining shape can be curled around to form a cone. Find the sector angle that produces the maximum volume for the cone made from your circle.'
Penny Nom lui répond.

An angle i a triangle 2020-05-16

Ogunjobi pose la question :
Two goal post are 8m apart a footballer is 34 m from one post and 38m from the other within what angle must he kick the ball if he is to score
Penny Nom lui répond.

Running in opposite directions around a circular track 2020-05-11

Alessandra pose la question :
2. Alan and Brian are two runners. Alan runs at 6.6 m/s and Brian runs at 8.4 m/s. They start from the same place on a circular 400 m track and run in opposite directions round and round the track.
(a) How far has Brian run when they pass each other for the first time?
(b) After they pass each other for the second time, how much further does Brian need to run in order to complete two laps (800 m)?
Penny Nom lui répond.

How long will it take to dig the trench? 2020-05-06

Marielena pose la question :
If the production rate for hand digging a trench is 1.2 mh/cy, how long would it take for one man to dig a trench 2 feet deep by 1 foot wide by 216 feet long?
Penny Nom lui répond.

Three numbers have a sum of 45 2020-05-06

Jayden pose la question :
Three numbers have a sum of 45. The greatest of the 3 numbers is 2 greater than the least number. What are the numbers? *
Penny Nom lui répond.

The flight of a football 2020-05-06

Michael pose la question :
Football is thrown from a 10-yard line. It reaches its highest height of 20 yards. It lands on the 50-yard line after 2 seconds. What is the equation of the parabola that models this throw? I really need help as I've been on this for the longest amount of time.
Penny Nom lui répond.

Signs at 1/3 mile intervals 2020-05-03

Heather pose la question :
The butterfly garden in St. Thomas gardens is a three mile loop at every 1/3 there is a sign along the loop to mark each 3rd of a mile along the loop if Melanie is standing next to the 7th sign at what mile is she?
Penny Nom lui répond.

The volume of a stone 2020-05-02

KHOSI pose la question :
A rectangular container is 9cm wide,17cm long and contains water to a depth of 11cm. A stone is placed in the water and the water rises 2,2cm .Find the volume of the stone
Penny Nom lui répond.

The volume under an an uneven surface 2020-05-01

Solon pose la question :
I am trying to fill an area of floor which has an uneven surface. I need to know the volume of fill. If you imagine a rectangular room (4 corners) that measures 189 inches by 240 inches and the depth at each corner is different.
Let us say corner #1 has a depth of 1", corner #2 has a depth of 0", corner #3 has a depth of 2" and corner #4 has a depth of 4".
How would i find the volume of said floor area?

Any assistance would be greatly appreciated!
Harley Weston lui répond.

Adding a service charge and the VAT 2020-04-30

richard pose la question :
was given a figure by a client been performance bonus of staff , the figure is 806,698.35 from this 806,698.35 is my company service charge of 10% and 5% of the service charge will be Vat to government in summary from 806,698.35 is 10% of service charge and 5% of service charge is the VAT
Penny Nom lui répond.

A system of equations. 2020-04-27

solomon pose la question :
xy + x =28
x + y +4
Penny Nom lui répond.

Power notation 2020-04-26

Aditi pose la question :
The power notation of -1 / 128
Penny Nom lui répond.

The width of a rectangle of land 2020-04-26

Teresa pose la question :
If a rectangle shape piece of land is 813 feet long. How many feet width would be 2 acres?
Penny Nom lui répond.

How many boxes will fit in a closet? 2020-04-24

Jordan pose la question :
Janelle has some boxes that are 43cm long, 23cm wide and 18cm tall. She wants to store them in a closet in her basement that is 2.2m tall, 1.1m wide, and 0.8m deep. What is the maximum number of boxes that Janelle can possibly fit in the closet?
Penny Nom lui répond.

Building a house in one year 2020-04-22

Fify pose la question :
If it takes 8 men to build a house in 450 days. How many men would it take to build the house in 365 days? Is there a specific method to calculate this please?
Penny Nom lui répond.

Four digit numbers starting with 6 2020-04-22

Judy pose la question :
I need to generate a list of 4 digit numbers using 0-9 where the first digit is 6 and no numbers can be repeated
Penny Nom lui répond.

An arch in the form of a semi-ellipse 2020-04-20

Anggelica pose la question :
an arch in the form of a semi-ellipse is 8 feet wide at the base and has a height of 4ft. how wide is the arch 1foot above the base?
Penny Nom lui répond.

Gravel for a French Drain 2020-04-17

Ray pose la question :
Hello,

** I am wanting to add 2 French Drain's in my yard. The 1st drain will be 25 ft. long, 8 in wide and 18 in deep. The pipe I'm using is 4in. in diameter. I'm trying to figure out how many yards of clean gravel I will need for this project?

** The 2nd French Drain will be 100 ft in Length, 10in wide and 18 in deep. I will also be using the 4in in diameter pipe for this drain. I am needing to see how many yards of clean gravel, I'll need for this drain? Any assistance would be greatly appreciated!! Thank you!!
Harley Weston lui répond.

The missing diameter of a truncated cone 2020-04-17

Brandon pose la question :
Need a formula to find missing large Dia of a truncated cone where the small dia =.19" Height= 2" and taper =16deg
Harley Weston lui répond.

An isosceles triangle 2020-04-16

jo pose la question :
Find the angle between the two sides of length 5 in an isosceles triangle that has one side of length 9 and two sides of length 5.
Penny Nom lui répond.

Why is a square a rectangle but a rectangle is not a square? 2020-04-15

A parent pose la question :
Why is a square a rectangle but a rectangle is not a square? Explain your answer.
Penny Nom lui répond.

Two chords 2020-04-14

Frank pose la question :
How to find the length of the radius of a circle if you know the lengths of two chords
Penny Nom lui répond.

A hexagon constructed from two triangles 2020-04-13

sunny pose la question :
Triangles AEC and FDB are equilateral triangles and EA= DF= 12cm. The polygon at the center of the star is a regular hexagon. What is the area of the hexagon?
Penny Nom lui répond.

A rectangular garde 2020-04-10

Denise pose la question :
In a rectangular garden a person says "if I made that bed 2 feet wider and 3 feet longer it Would have been 64 sq,ft bigger. But if it had been 3 feet wider and two feet longer It would have been 68 sq.ft bigger.
What is the length and width of the garden bed?
Penny Nom lui répond.

Three consecutive odd integers 2020-04-10

Roxie pose la question :
What is three consecutive odd integers?
Penny Nom lui répond.

Setting up a linear equation 2020-04-10

Jessie pose la question :
Michaela and Aleah play on the same basketball team. In one game, Michaela scored one fifth of the teams points and Aleah scored one tenth of the teams points. Together, they scored a total of 42 points. How many points did the team score?

I can't figure out how to put together the equation with the given variables. I have to show the work and I also need to know how to make that kind of equation. Thanks!
Penny Nom lui répond.

A pond in a garden 2020-04-09

Jin pose la question :
c) I have a large square pond set inside a square garden: both the pond and the garden have sides which are a whole number of metres, and outside the pond, the garden is grassed over. The area covered by grass is 188 square metres. Find the area of the pond. (5 marks)
Penny Nom lui répond.

Form a square and a triangle from a wire 2020-04-08

Raahim pose la question :
2. A 2 meter piece of wire is cut into two pieces and once piece is bent into a square and the other is bent into an equilateral triangle. Where should the wire cut so that the total area enclosed by both is minimum and maximum?
Penny Nom lui répond.

A 5 digit number 2020-04-04

Rajesgy pose la question :
Guess the 5 digit number
Hint:
Number is divisible by 2
Average of all numbers is 5
Last 2 digit is divisible by 7 and the number is less than 50000
Only one odd digit
Penny Nom lui répond.

An arithmetic sequence 2020-04-04

ally pose la question :
-10 ... last term 35 common difference is 3
(a) find the number of term in the sequence.
i have lost the formula.
Penny Nom lui répond.

A linear system 2020-04-02

Dadzie pose la question :
x+s=8→1
y+x=13→2
y-p=6→3
s+p=8→4
Penny Nom lui répond.

A stem-and-leaf plot with decimals 2020-04-02

Renee pose la question :
I am an AP Statistics student who is reviewing for the exam.

On one of my review worksheets, we have to create a stem-and-leaf plot for values with 2 decimal places (i.e. 9.14, 8.14, 8.74, 8.77, 9.26, 8.1, 6.13, 3.1, 9.13, 7.26, and 4.74).

How would I make the stem-and-leaf plot for this? I've already searched your database and nothing popped up.

If you could help me, that would be great. Thank you!
Penny Nom lui répond.

A circle in a square 2020-04-02

Sabra pose la question :
Hello, I have twins in the 7th grade that are learning how to find circumference of circles. I am struggling with figuring out how to help my children to find the answer to this question:

Tye has a square piece of yellow felt that has an area of 81 square inches. She wants to cut the largest circle possible from the material to create a sun for her art project. What is the area of the felt circle? Use 3.14 for pi. Round to the nearest hundredth if necessary.

I wasn't sure if I am to find the area of the circle through finding the area of the square or what steps we needed to follow to find the answer. Once I can see how one is worked out step-by-step, I usually can help them along with questions that are similar.
Penny Nom lui répond.

Four digit combinations from 1-3-4-8-0 2020-03-26

nancy pose la question :
Good evening. I'm in a quandry. Can you help? I would like to know what 4-digit combinations can be derived from 1-3-4-8-0 no repetitions
Penny Nom lui répond.

The center and radius of a circle 2020-03-25

Riley pose la question :
so it says find the center and the radius of the below circle
x^2+(y-6)^2=121

i need help learning how to solve this
Penny Nom lui répond.

A hemisphere and a cylinder 2020-03-23

Monalizsha pose la question :
Wat is the volume and the surface area of the hemisphere and cylinder (both are together) The height is 12cm of the cylinder and the diameter is 6cm
Penny Nom lui répond.

Aaron and Bill's ages 2020-03-12

Heather pose la question :
My granddaughter had this third grade math problem. Aaron is 4 times as old as his brother Bill. In ten years Aaron will be twice Bills age. What are their ages?
Penny Nom lui répond.

Six-digit telephone numbers 2020-03-12

Lulamile pose la question :
What is the probability that a six-digit telephone number has no repeated digits? The telephone number cannot begin with a zero
Penny Nom lui répond.

A times table in base 5 2020-03-11

Felix pose la question :
Design a time table for numbers 1-10 in base 5
Penny Nom lui répond.

Is there an equation to find what percent of 0 is 1? 2020-03-09

Asher pose la question :
Question: Is there an equation to find what percent of 0 is 1.

I remember learning quite a long time ago that the answer inst 0 and it isn't infinity. I'm pretty sure it was something like %=0 approaching infinity or %=1 approaching infinity. And I know it depends what value you assign the numbers i.e. dollars or temperature. Furthermore, is asking "what percent 1 dollar is of 0 dollars" the same question as "what percent profit do you make from selling something worth 0 dollars for 1 dollar."

Thank you for your time and consideration -Asher
Penny Nom lui répond.

Sam and Claudia go on a bike hike 2020-03-03

Christie pose la question :
Sam and Claudia start at the same time on a bike hike of 150 miles. Sam travels 3 miles per hour faster than Claudia and finishes the trip 8 1/3 hours before Claudia. At what rate in miles per hour does Sam travel?
Penny Nom lui répond.

Covering 1 acre, 6" deep 2020-03-02

Jim pose la question :
How many cubic yards does it take to cover 1 acre 6" deep. Thank you Also, can you show me how you determined that answer.
Penny Nom lui répond.

Fireman Fred needs to stay fit 2020-03-02

Chamundeswari pose la question :
How do I explain this problem to a year 3 kid?

Fireman Fred needs to stay fit for his job. He runs 4.5km, 4 mornings, a week . if it takes him 4 minutes and 15 seconds on average to run 1km, how much time does he spend running over 4 weeks?
Penny Nom lui répond.

The volume of a berm 2020-02-28

jason pose la question :
how much dirt is in an 20'w 12't 1350'l berm
Penny Nom lui répond.

A straight line graph 2020-02-26

Penehafo pose la question :
I have a problem of drawing a straight line graph by the equation y=2x-1
Penny Nom lui répond.

The height of an isosceles triangle 2020-02-23

Reagan pose la question :
I need to find the height of an isosceles triangle with a base of 6 and sides of 4 units. How do I find it?
Penny Nom lui répond.

Degrees, minutes and seconds 2020-02-21

Jonathan pose la question :
If a cone has an angle of 22 degrees, when i place it flat on a surface, the new resulting central angle is now at 68.69123834, but how come when i saw it on my friend it say 68 degree and 40 minutes, what is this minute?
Penny Nom lui répond.

30% profit 2020-02-20

Sidra pose la question :
A car dealer bought a car for £7500 and sold it for 30% profit.

For how much did he sell the car?
Penny Nom lui répond.

Multiplication base 8 2020-02-19

Tamesha pose la question :
Let’s count with the symbols 0,1,2,3,4,5,6,7 (base 8)
A). Create a multiplication table for this base
B). Compute the following products using the multiplication algorithm
I). 7605 times 3713
II). 63725 times 40627
Penny Nom lui répond.

The volume of a cylinder 2020-02-12

Mack pose la question :
I need to find how close the actual volume was of a cylinder (with both ends closed) to being optimized. Can you please send step by step response?

Height = 11cm
Circumference = 24.4cm

Thanks,
Mack
Penny Nom lui répond.

Sipping juice from a Tetra Pak 2020-02-11

Anjhelic pose la question :
Karen is sipping juice from a 1 in. by 3 in. by 6 in tetra pack at the rate of 0.5in³/sec. How fast is the height of juice in the pack decreasing?
Harley Weston lui répond.

The area of a triangle from two angles and a side 2020-02-10

Chinmoy pose la question :
How to measure the area of a triangle with two angles and length of the included side known?
Harley Weston lui répond.

A parabolic arch 2020-02-06

icyy pose la question :
how high is the parabolic arch of span 20 feet and height of 16 feet, at a distance 5 feet from the center?
what equation will I be going to use? thank you
Penny Nom lui répond.

The side length of a hexagon 2020-02-05

Rob pose la question :
I have a hexagon that is 8 feet wide how long would the sides be?
Penny Nom lui répond.

What was the original price? 2020-02-01

Gracie pose la question :
If you buy something for $6.30 and it’s 30%off what was the original price?
Penny Nom lui répond.

A system of inequalities 2020-02-01

Isaac pose la question :
Austin has x nickels and y dimes, having a maximum of 15 coins worth a minimum of $1 combined. No more than 4 of the coins are nickels and no less than 11 of the coins are dimes. Solve this system of inequalities graphically and determine one possible solution.
Penny Nom lui répond.

Translation by a vector 2020-01-30

Jude pose la question :
M(3,-2) is the image of the point M under a translation by the vector (-5,2). Find the coordinates of M
Penny Nom lui répond.

A question about fractions 2020-01-26

Awotile pose la question :
A fraction whose denominator is more than the numerator is double when the numerator is increased by 6 and the denominator is increased by 5 find the original fraction?
Penny Nom lui répond.

A point on a line 2020-01-25

Samved pose la question :
The line 3x/5 - 2y/3 + 1 = 0 contains the point (m, 2m-1). Calculate the value of 'm'.
Penny Nom lui répond.

The volume of a coffee cup 2020-01-25

Amirah pose la question :
What is the volume of a polystyrene cup with a height of 8cm, diameter of 5cm at the top and 4cm at the bottom when it is filled with water?
Penny Nom lui répond.

gcd(a^2 + b^2, a + b) 2020-01-19

Roger pose la question :
I am stuck with this problem: find the gcd(a^2+b^2, a+b), where a & b are relatively prime integers not both zero.
Penny Nom lui répond.

Filling a 48 cubic meter tank 2020-01-19

kamohelo pose la question :
An empty tank for storing water from a borehole has a volume of 480m3 if it is filled by a pump that pump water at a rate of 16L/s how many hours will it take the pump to fill this tank
Penny Nom lui répond.

The angle of a countersunk screw 2020-01-19

Barbie pose la question :
I need to be able to verify the angle used for the head of a countersunk screw.
I have the diameter of the head, diameter of the shank and height between the two. I assume it would be considered a frustum.
For example:
A standard 90 degree metric flat head screw in an M2 diameter has a head diameter of 3.65mm, the actual thread diameter is 1.98mm and the height of the head is 1.20mm.
How can I prove that it is a 90 degree angle?
Harley Weston lui répond.

Investigating y = (-2)^x 2020-01-13

Gonzalo pose la question :
This is not precisely a maths question, but it is formulated based on my maths curiosity. Fidgetting with my new graphic calculator, I started graphing things and had the idea to graph $y=(-2)^x.$ The result surprised me, and I thought a little bit about it, stored it on the back of my brain, and promised myself to look deeper into it someday.
Harley Weston lui répond.

What is the smallest 4 digit number? 2020-01-10

Ullas pose la question :
What is the smallest 4 digit number?
Penny Nom lui répond.

The difference between two number is 7 2020-01-07

Jaypercey pose la question :
the difference between two number is 7 find the two number if the larger 3times the smaller
Penny Nom lui répond.

What do you call a 43-sided polygon? 2020-01-06

Alniko pose la question :
What do you call a 43-sided polygon and what is its interior angle's total measure?
Penny Nom lui répond.

The equation of a line 2020-01-05

coco pose la question :
Good afternoon If relationship between total cost and the number of units made it linear ,and if costs increases by 7$ for each additional unit made ,and if the total cost of 10 units is 180$ .
Find the equation of the relationship b/n total cost (Y) & number of unit made (x).
Penny Nom lui répond.

Dividing the tips 2020-01-02

Pat pose la question :
trying to figure out division of tips I have 3 full time employees 40 hrs a week and 1 part time worker 12 hours a week what percentages do i give them to give them appropriate tips :-)
Harley Weston lui répond.

A circle, a point, and a tangent line 2019-12-31

Faisal pose la question :
A circle has radius 10 units and passes through the point (5,-16). The x-axis is a tangent to the circle. Find the possible equations of circle?
Penny Nom lui répond.

Sabrina's age 2019-12-31

Nakyi pose la question :
The sum of Sabrina’s age and twice her sister’s age is equal to their mom’s Age. If Sabrina’s sister is two years older than her and their mom is 37, how old is Sabrina?
Penny Nom lui répond.

81^5 as a power of 3 2019-12-29

NA pose la question :
How do we turn 81^5 into the power of 3?
Harley Weston lui répond.

A scale drawing 2019-12-28

Boris pose la question :
If the scale drawing of a car park is drawn to a scale of 1cm representing 7m and the car is 133m by 93m, find the length of the drawing
Penny Nom lui répond.

Partitions of a set 2019-12-21

Ghani pose la question :
1. Are set partition "sets"?

2. If they are so then, why are both {{a}{b,c}} and {{a,b}{c}} said to be valid partitions
of A ={a,b,c} despite them having different elements?

(I understand that set are equal if they have the exact same elements).

Thank you!
Harley Weston lui répond.

10 miles in 2 minutes 2019-12-20

james pose la question :
how fast would you be traveling to go 10 miles in 2 minutes?
Harley Weston lui répond.

Volume of a tree 2019-12-19

Maria pose la question :
I have trees for sale. I need to calculate the volume of a tree from base which is wider than the stem.The base will be used for the making of hurleys, similar to hockey sticks so the wider base is crucial.
Penny Nom lui répond.

Odds 2019-12-16

Craig pose la question :
I’d like to know what are the odds of a lotto machine giving out a specific 4 digit number as a quick pick?
I know there are 10,000 possible 4 digit combinations. So let’s say the number is 3587 what are the odds the lotto machine spits it out EXACTLY that way on a quick pick?
Penny Nom lui répond.

Input and output of a function 2019-12-16

Destanie pose la question :
What is the output if the input is -1???
Penny Nom lui répond.

Some questions about sets 2019-12-15

M.Azzi pose la question :
Hello, (I) - In set theory can a given set contain both elements and subsets, as "elements", as in : A = {1,2,{},3,{{3}},8}

If yes :
1 - then, is |A| = 6 ?
2 - if the empty set is a subset of every set,
2. 1. does {} = {{}}, {{{}}} etc? , and if the is true what are the respective cardinals of the latter three? (0,1,1?).
2 . 2. Why isn't {1} equal to {{},1}? and why should these two be equal without having the same cardinality?

Sorry if my questions are not well expressed.

Thank you for the great service you provide.
Harley Weston lui répond.

More on lampshades from a cone 2019-12-14

Guy pose la question :
from an earlier post re; lampshade from a cone
Being math ignorant I cannot figure out how this equation makes sense

\[\frac{2\pi \times 33 - 2\pi \times 20}{2\pi \times 33} = \frac{13}{33}\]
imagine these as fractions multiplied by 360 to calculate a section of a circle to form a cone
Thx
Penny Nom lui répond.

A function problem 2019-12-12

akash pose la question :
if (2,1) is on the f(x), what is the coordinate of the corresponding point of -2(f(2x-6)+5?
Penny Nom lui répond.

Guess and check 2019-12-11

Mariajosé pose la question :
brian bought 98 stickers. the number of stickers per sheet was 2 times as large as the number of sheets. how many sheets did brian buy
Penny Nom lui répond.

The fencing needed for a square pasture 2019-12-10

Penny pose la question :
I'm trying to calculate how many feet of fence I will need to fence a 4 acre square pasture.
Harley Weston lui répond.

Strings made from three characters 2019-12-10

Kelley pose la question :
Hi,

I vaguely remember some formula for determining all the possible combinations of a set of numbers (or whatever).

If I have 3 numbers (0 - 2), then I have 0, 1, 2, 00, 01, 02, 10, 11, 12, 20, 21, 22, 000, 001, 002, 010, 011, 012, 020, 021, 022, 100, 101, 102 and so on.

What is the formula for determining all potential results?

Thank you!!

Kelley
Penny Nom lui répond.

The equation of a line 2019-12-10

Jourdan pose la question :
Suppose a mining company will supply 96000 tons of ore per month if the price is 80 dollars per ton but will supply 70500 tons per month if the price is 20 dollars per ton. Assuming the supply function is of the form y = m x + b , find the slope, m and y-intercept, b
Penny Nom lui répond.

Roll two dice and record the difference 2019-12-09

Barbara pose la question :
Suppose you roll two dice 100 times. Each time you record their difference (always subtracting the smaller one from the bigger one to get a positive difference). The possible values you get are 0,1,2,3,4 and 5. You record the frequency of each value in the following table:
Difference of two dice 0 1 2 3 4 5
Observed frequency 12 31 26 13 10 8
Let your null hypothesis be that the dice are fair, and the alternative hypothesis be that they are not fair. Using a confidence level of α = 0.10, test the null hypothesis by a goodness-of-fit test.

Hint: begin by
completing table:
x 0 1 2 3 4 5
f(x)
Penny Nom lui répond.

Two people are clapping their hands 2019-12-06

Yukti pose la question :
Two people are clapping their hands, but with different frequencies. Ramya claps her hands 17 times per 3 minutes, and Kumar claps his hands 31 times per 5 minutes. They start clapping at the same time. How many times does each one clap before they clap together at the same time again?
Penny Nom lui répond.

3/8 and 0.375 2019-12-05

Zamyiah pose la question :
how does 3/8 turn into 0.375 i just don't understand it the question is hard. please answer in time thank you for your time.
Penny Nom lui répond.

Sigma notation 2019-12-04

Kenneth pose la question :
What would be used for the top and bottom indices for the sigma sign in my example shown below?
If the amounts were 1 + 2 + 3, the top index would be 3 and the bottom would be i = 1, but if the amounts are 1 + 2 + 4, or 1 + 0.05 + 1/3, what would the indices be since these amounts are in an uneven pattern.

I thank you for your reply and explanation

Harley Weston lui répond.

Combinations of cities 2019-12-03

Oliver pose la question :
Hi! I'm looking to find out how many combinations (non repeating) there are for 6 cities.
If we name the cities A to F, possible combinations would include;
A.
A, B.
B.
A, B, C.
A, C.
B, C.
C.

and so on.
Thank you!
Penny Nom lui répond.

Two digit numbers 2019-12-03

Lacy pose la question :
Using the digits zero through nine, how many two-digit numbers can be formed,which do not have a four or five?
Penny Nom lui répond.

The area and volume of a wedge 2019-11-30

Jasmine pose la question :
what is the volume and surface area of a wedge with definition
Penny Nom lui répond.

An exterior angle of a parallelogram 2019-11-29

A student pose la question :
one angle of a parallelogram is four times the measure of the exterior angle adjacent to it. find the interior angles
Penny Nom lui répond.

Caleb age and Juliet age add up to 25 years. 2019-11-22

tolulope pose la question :
Caleb age and Juliet age add up to 25 years. eight years ago,Caleb was twice as old as Juliet. how old are they now.
Penny Nom lui répond.

The length and width of 1 1/3 acres 2019-11-22

Ben pose la question :
I’m trading to figure out what the length and width of 1 1/3 of an acre would be in a rectangle or in a perfect square
Penny Nom lui répond.

cos (3pi/2 -x) 2019-11-20

sam pose la question :
1. express the following as a trigonometric function of angle x for cos (3pi/2 -x) the answer in the textbook is -sin x but i am unsure of the process to get the answer.
Penny Nom lui répond.

A four person race 2019-11-19

Juvy pose la question :
Ben finished seven seconds ahead of Mike.
Noel finished three seconds behind of Sam.
Mike finished five seconds behind Noel.
In what order did the friends finish the race?
Penny Nom lui répond.

A hexagonal planter 2019-11-19

Colleen pose la question :
I need to build a hexagon planter around a 32” square box. How long is each side of the hexagon?
Penny Nom lui répond.

Beginning algebra 2019-11-19

Maya pose la question :
Two numbers have a sum of 57. Three times the first number is 13 less than the second number. Find the numbers.
Use let statements to help you solve. (Grade 9 math)
-Maya (help would be appreciated)
Penny Nom lui répond.

The product of 3 integers is -24 2019-11-06

Rick pose la question :
This is a question on my sons pre-ap practice quiz. I think that there is information missing (?)

The product of 3 integers is -24
The sum of 3 integers is -12
What are the 3 integers ?

This is exactly how it was written on his quiz paper. I have wasted to much time on the internet, trying to find a formula(s) to help him.
Please help me.
Penny Nom lui répond.

The sum of the ages of Ruth and her mother is 77 years. 2019-11-06

Lydia pose la question :
The sum of the ages of Ruth and her mother is 77 years. The difference in their ages is 27 years. How old is each?
Penny Nom lui répond.

Algebra 2019-11-06

Krizhia pose la question :
How is y= 1/2 * (x-1)² be x= √2y + 1. Please show me the steps
Penny Nom lui répond.

Bearings 2019-11-05

Deborah pose la question :
three ships p q and r are at sea. the bearing of q from p is 30° and the bearing of p from r is 300°. if |PQ|=5km and|PR|=8km
I.illustrate the information in a diagram
II. calculate correct to 3sf the I. distance between Q and R. II. bearing of R from Q
Penny Nom lui répond.

Increasing your average mark 2019-11-01

Elena pose la question :
After 9 weeks Mikayla has an average ark of 5 out of 10 in the weekly spelling tests. What is the minimum number of extra weeks now required to raise her average to 7?
Penny Nom lui répond.

Liza works for a call center 2019-10-31

Timothy pose la question :
Liza knows that in the long term, she has a 65% chance of making a sale when calling on customers. One morning, he makes Six calls.
a. What is her probability of making three calls?
b. What is her probability of making sales fewer than three?
Penny Nom lui répond.

The divisors (aliquot parts) of a positive integer 2019-10-31

Kenneth pose la question :
Is there a fast and simple method that can be used to determine the aliquot parts, whole, positive numbers that can divide into another whole, positive number?
Harley Weston lui répond.

Alex rents a car for one day 2019-10-31

Arshia pose la question :
Alex rents a car for one day. The charge is $25 plus $0.20 per mile. Alex wants to spend exactly $110. How many miles can he drive?
Penny Nom lui répond.

The largest integer k so that that 3335^k is a divisor of 3336! 2019-10-29

Brandon pose la question :
Hello my name is Brandon and I having difficulties in solving the following question: Given the number 3336! = 1.2.3.4........................3336 . What's the greater positive integer number k with the condition that 3335expk is a divisor of 3336!
Thanks for your help.
Penny Nom lui répond.

Even 5 digit palindromes 2019-10-24

daniel pose la question :
How many palindromes of 5 digits are even?
Penny Nom lui répond.

The center of a circle 2019-10-24

Patrick pose la question :
I'm trying to find a quick calculation to find the center of the circle that will touch the 3 points of an isosceles triangle.
Known dimensions are length of the triangle base and the height from the top point to the middle of the base.
Thanks in advance,
Kind regards,
Patrick
Penny Nom lui répond.

How many numbers from the set have the sum of its digits equal to 2? 2019-10-24

Marcel pose la question :
Hello. My question is the following: Given the set {1,2...........10exp2019}, how many numbers from the set have the sum of its digits equal to 2?
I got some of them : 2 20 200 2000 20000 .......2. 10exp2018 11 110 1100 11000 110000....101 1010 10100 101000 1010000....10011 10010 100100 1001000 1010000.....10001 100010 1000100 10001000,,,,,,100001 1000010 10000100....... My problem is that I have difficulty in finding a strategy to obtain the exact quantity of numbers.
Please help me, thanks
Penny Nom lui répond.

The perimeter of a piece of a circle 2019-10-18

Arwin pose la question :
The radius of a circle is 17 cm. A chord XY lies 9 cm from the centre and divides the circle into two segments. Find the perimeter of the minor segment.
Penny Nom lui répond.

The domain of f + g 2019-10-16

Angel pose la question :
The domain of f+g when f(x)=8x+3 and g(x)=1-5x
Penny Nom lui répond.

How do you find the length and the width if all you had was area? 2019-10-16

Ali pose la question :
So, How do you find the length and the width if all you had was area?
Penny Nom lui répond.

Simultaneous equations 2019-10-16

deepak pose la question :
This is too complicated please help me
8/x - 10/y = 1 and x+y=9
Penny Nom lui répond.

The difference of two numbers is 42 2019-10-14

Patrick pose la question :
The difference of two numbers is 42 and the larger number is 8/5 of the smaller number. Find the two numbers.
Penny Nom lui répond.

Arranging 10 digits 2019-10-09

Laxmi pose la question :
1)The integers 0 to 9 are arranged along a straight line in some order.a) find a possible arrangement in which the sum of any three adjacent numbers is less than 15.b)is there an arrangement of this kind 0 is not included in the numbers.
Penny Nom lui répond.

A binomial probability question 2019-10-08

venni pose la question :
The Medassist Pharmaceutical Company receives large shipments of aspirin tablets and uses this acceptance sampling plan: Randomly select and test 24 tablets, then accept the whole batch if there is only one or none that doesn’t meet the required specifications. If a particular shipment of thousands of aspirin tablets actually has a 4% rate of defects, what is the probability that this whole shipment will be accepted?
Penny Nom lui répond.

Four fours 2019-10-03

Irene pose la question :
Using number 4, four times with any equation and the answer will be -2 and -5
Penny Nom lui répond.

The binomial distribution 2019-10-01

PY pose la question :
An on-line game called ‘Shop Quiz’ is held by an e-commerce platform, from Monday to Friday every week. It consists of 8 multiple choice questions (MCQ) and each question has four options (A, B, C, D). Only one option is the correct answer. People who are able to correctly answer all 8 questions are winners and will be awarded a number of on-line shopping credits. Let X represent the number of questions that a person can answer correctly in a ‘Shop Quiz’.

1) Explain why Binomial distribution might NOT be a suitable distribution for the random variable X.

Mr. Saul likes playing the quiz, however, he is afraid that he might not have the necessary knowledge to answer the quiz questions. (The quiz questions cover a variety of topics including science, history, entertainment, sports and geography, etc.) Therefore, he tries to win the game by simply guessing the answers to each question.
Penny Nom lui répond.

Four less than three times a number is 20 2019-09-29

Linda pose la question :
four less than three times a number is 20,what is the number?
Penny Nom lui répond.

Fractions and negative powers 2019-09-22

Will pose la question :
-2/3 to the -6 power
Penny Nom lui répond.

Bearings 2019-09-22

Jean pose la question :
X is due north of Y and 2km distant. Z is due east of Y and has a bearing of S35°12'E from X. How far, to the nearest metre, is Z from X? Will you help me solve this problem?
Harley Weston lui répond.

The volume of a fire hose 2019-09-18

Carlou pose la question :
How many liters of water in a 2.5 inches diameter of fire hose with a 20 meters in length
Penny Nom lui répond.

4" x 4" square tiles 2019-09-18

Jill pose la question :
how many 4" x 4" square tiles would I need for 50 square feet?
Penny Nom lui répond.

Why does the circle have a larger area? 2019-09-16

A student pose la question :
given a circle and square of same perimeter, why does the circle have a larger area

I’m looking for an intuitive explanation rather than a computational one. Thanks
Harley Weston lui répond.

Mandy walks to work 2019-09-15

Kenneth pose la question :
Mandy walks to work at a constant rate. One-third of the way to work, she passes a bank. Three-fourths of the way to work, she passes a book store. At the bank her watch reads 7:52 A.M., and at the book store it reads 8:02 A.M. At what time is Mandy one-half of the way to work?
Harley Weston lui répond.

A one foot rise in water level 2019-09-15

Stuart pose la question :
If a lake were to rise one foot - how many linear feet would it spread onto the shore line ? What is the correlation - 1 foot of a rise = 10 feet onto the shore ? Does it depend on the lake size - if so Lake Ontario in Canada.
Penny Nom lui répond.

The amount of concrete in a foundation 2019-09-11

Lorinda pose la question :
How do you calculate ( in cubic yards) how much concrete is needed for the foundation of a rectangular building 40 ft by 85 ft if the foundation walls are 8 inches thick and 7 ft 6 inches high?
Penny Nom lui répond.

What is -5 squared? 2019-09-10

Pori pose la question :
What is -5 squared?
Penny Nom lui répond.

The number of integers that satisfy some conditions 2019-09-10

Ryu pose la question :
Using only the digits 0 1 2 3 4 5 6 7 8 9 without repetition, how many integers are:
(a) Greater than 999, less than 10,000, start with an even digit and are even?
(b) Greater than 999, less than 10,000, start with an odd digit and are odd?
(c) Greater than 999, less than 10,000, start with an even digit and are odd?
(d) Greater than 999, less than 10,000, start with an odd digit and are even?
Penny Nom lui répond.

Problem solving 2019-09-08

Arunsi pose la question :
When a fifth of a certain number is added to 3 the result is 17. What is the number?
Penny Nom lui répond.

Vectors 2019-09-06

Kayla pose la question :
Hi! Due to time constraint issues, we skipped vectors in Pre-Calc last year. However, I'm attempting to complete my AP Physics summer homework and there are 3 problems with vectors. As I explained, I have no idea even where to begin and as such I need some help.

Problem 1:
A plane flying at 90° at 45 m/s is blown toward 0° at 62 m/s by a strong wind. Find the plane's resultant velocity. I have tried all sorts of online calculators but none are providing me with a formula I can use to solve this problem on my own.

Problem 2:
If you walk 367 m North and 785 m West what is your total displacement from your original location?
What is the problem asking for when it says displacement?

Problem 3:
A plane travels on a heading of 127.0° at a velocity of 25 km/hr. What are the horizontal and vertical components of the plane's velocity? As you know already, I have never done vectors so I don't know what horizontal and vertical components of velocity are.

Thank you So Much for your help!! I am struggling!!

- Kayla
Penny Nom lui répond.

Using the Laws of Exponents 2019-09-06

Samiya pose la question :
i have been struggling with the laws of exponents so im having trouble with this question. the question is to write (b*exponent2*c)(b*exponent5*c*exponent4*)
Penny Nom lui répond.

Average savings 2019-09-06

Puchu pose la question :
A student was saving an average of £2 per week for 25 weeks. He then found a part time job and after total of 45 weeks his average savings rose to £9 per week How much did he save over 20 weeks after finding job?
Penny Nom lui répond.

The volume of a berm 2019-09-06

John pose la question :
I need to construct a berm:
8' tall
5' across the top
20' at the base
125' long
How much soil will I need
Harley Weston lui répond.

How was math created? 2019-09-03

Phu pose la question :
How was math created?
Harley Weston lui répond.

A negative minus a negative 2019-09-03

Maggie pose la question :
Why is a negative minus a negative a negative?
Penny Nom lui répond.

Can one equation with two variables be solved algebraically? 2019-08-30

Don pose la question :
Can one equation with two variables be solved algebraically?
Penny Nom lui répond.

400 in 7.5 billion 2019-08-28

Emma pose la question :
What is a better way to express 400 in 7.5 billion? My daughter has a rare condition, I want to know the answer to say “she is 1 in a ...”
Penny Nom lui répond.

David Is 6 years older than his sister Delia 2019-08-27

Abigail pose la question :
David Is 6 years older than his sister Delia. In 10 years the sum of There age 52. how old are David and Delia today
Penny Nom lui répond.

A flat top cone 2019-08-25

Mary pose la question :
I want to make a paper model of a flat top cone with the radius of the base is 12.5 cm and the radius of the apex is 7 cm.The height is 15 cm and the radius of the apex is 5 cm. The height is 15 cm.
Can you help me with the angle and construction, please?
Thanks.
Penny Nom lui répond.

The length of half an acre 2019-08-23

Angeles pose la question :
How many Feet Long In Half An Acre (Rectangle)
Penny Nom lui répond.

A problem with logarithms 2019-08-23

Iriogbe pose la question :
Find the value : if log3 (a-6) =2b and log2 (a-7) =3b
Penny Nom lui répond.

The average height of a wall 2019-08-15

Jeff pose la question :
Trying to figure the average height of a sloped foundation wall.
The lowest point is 24 inches or 2 feet.
The highest point is 116 inches or 9’ 8 inches.
Can this be figured without the degree of slope or can we assume it is Equaled sloped from point a to point b. Thanks
Penny Nom lui répond.

The area of a shape 2019-08-14

Lymp pose la question :
Hi, for math we are calculating the area of shapes and my teacher wanted me to research how to calculate the area of shapes so i was wondering if you could tell me how t calculate the area of any shapes. Please tell me how to calculate a cross, parallelogram and a polygon
Penny Nom lui répond.

A cone of maximum volume 2019-08-14

Refilwe pose la question :
The slant height of a cone is 10cm. Determine the radius of the base so that the volume of the cone is a maximum
Penny Nom lui répond.

The radius of a circle of given area 2019-08-14

shelby pose la question :
What's the radius of a circle that has an area of 803.84cm2? I also need examples of how you got the answer.
Penny Nom lui répond.

Conversing from tons to cubic yards 2019-08-03

Kathleen pose la question :
Is there a simple formula to convert the following from tons to cubic yards:
Topsoil
Sand base
Fill dirt
Penny Nom lui répond.

Filling a hole 2019-08-01

Jackie pose la question :
Filling a hole 25ft round 3ft deep how much dirt is needed?
Penny Nom lui répond.

A combination lock 2019-08-01

markbo pose la question :
A combination lock has 0-9 plus Y on its keypad. A code is generated by selecting 4 digits from those keys (0-9 and Y) with no repeated choices, but sequence does not matter
(i.e. 1-2-3-4 is the same as 4-3-2-1, and the same as 3-4-1-2 and counts as one combination)

How many different 4-digit codes are possible in this scenario?
Penny Nom lui répond.

Combination lock 2019-07-31

Antony pose la question :
Hello.
So my 3yr old daughter has had a bit of a play with the 3 dial combination lock on my backpack and locked it closed.
I am looking for all the possible combinations to go through a process of elimination to find the combination she has set.
To be clear. There are three dials, each with the numbers 0-9. I have read 10x10x10=1000 options but not sure if that is correct .. feels too small?
Many thanks in advance.
Penny Nom lui répond.

Six digit numbers from 4 digits 2019-07-30

Tab pose la question :
How many six digit combinations can be made from the numbers zero, two, five, eight? With repetition of numbers
Penny Nom lui répond.

The volume of a well 2019-07-30

Jordan pose la question :
How much water could my well hold if the depth of the well is 30 feet feet and the diameter of the well is 24 feet ?
Penny Nom lui répond.

A problem involving ratios 2019-07-24

Dhanendra pose la question :
A plot reserved for playground in the ratio of length and breath 11:4 gram panchayt spends rupees 45000 for boundary at the rate of 100 per m. Find the dimensions of the plot.
Penny Nom lui répond.

Packing chocolates in boxes 2019-07-22

CHESKA pose la question :
1.levy can pack the chocolate bars either with 35 bars in a box,with 42 in a box, or with 49 in a box. what is the least number of chocolate bars that he has?
2. the blue light of a Christmas light blinks every 2 second. the red light blinks every 3 second and the yellow light blinks every 5 second. how many times will the three lights blink at the same tims in one hour?
3.a wooden straightedge can exactly measure an 825 cm rope, a675 cm rope, and 375 cm rope. what is the least possible length of the straightedge? how many times will it measure each rope?
Penny Nom lui répond.

Listing three digit combinations 2019-07-17

Larry pose la question :
Using numbers 0-9, what are all the possible combinations of choosing 3 numbers regardless of order and no 3 numbers being used more than 2 times in the combination. So no 1,1,1, 2,2,2, 3,3,3 etc. Order does not matter. Could you please send me a listing of all those combinations?
Penny Nom lui répond.

Three digit codes 2019-07-14

Jessica pose la question :
I need to find the total number of 3 digit codes using the digits 1 through 9. How many of these codes would be odd numbers, and how many even?
Penny Nom lui répond.

The maximum volume of a cone 2019-07-14

A student pose la question :
find the maximum volume of a cone if the sum of it height and volume is 10 cm.
Penny Nom lui répond.

A three digit code 2019-07-14

Hannah pose la question :
I have a briefcase with a three-digit code. I can set the code myself using digits 1 through 9, assuming that each digit can only be used once. How many possible codes are there?
Penny Nom lui répond.

Volume of a spherical cap 2019-07-12

Shanto pose la question :
In a jar of water, we kept a sphere with radius r. Then 75% of its volume went under water. Find out the distance of the top of the sphere from the surface of the water.
Penny Nom lui répond.

Price per square meter to price per square inch 2019-07-09

Al pose la question :
If something costs $2.5 square meter, how much would it cost in square inches? How do i convert costs per square inch, into square meters?
Harley Weston lui répond.

Order of operations 2019-07-06

Carri pose la question :
What is the answer (( 5 × 12) / 3 ) + 30 - 50
Penny Nom lui répond.

Distance traveled 2019-07-03

J pose la question :
If a fly flies at 15 feet per a second between two walls closing in upon themselves. Wall A is moving to the right at 3 feet a second and wall B is moving to the left at 15 feet a minute, how far will the fly fly before the walls touch?
Penny Nom lui répond.

Forty foot and 9 spacers 2019-06-28

Christopher pose la question :
Ok I've got forty foot and 9 spacers one each end and 7 between what is the distance between the seven in the middle
Penny Nom lui répond.

One part in 10^x 2019-06-26

Jim pose la question :
What is the meaning of the phrase ‘one part in 10x” where the x is an exponent? I have seen these examples: “...better than one part in 10x” and “...to within one part in 10x.”
Penny Nom lui répond.

The volume of a frustum 2019-06-24

Abdulganiy pose la question :
A right pyramid on a base 10cm square is 15m high
a)find the volume of the pyramid
b)if the top 6m of the pyramid is removed what is the volume of the remaining frustum?
Penny Nom lui répond.

How many cubes are in a 3x3x3 cube? 2019-06-24

Darren pose la question :
Dear Sir/Madam, How many cubes of different sizes (eg. 1x1x1, 2x2x2, 3x3x3) are there in total in say, a 3x3x3 cube? I have trouble figuring this out.

Yours faithfully,
Darren
Penny Nom lui répond.

The area of a patio 2019-06-23

Miguel pose la question :
Stephanie has 60 feet of metal fencing material to only fence 3 sides of a rectangular patio. A tall metal wall serves as the fourth side of the rectangle. write a function for the area the garden (A) in terms of width in feet (x) What measures of the width would give an area of at least 150 feet?
Penny Nom lui répond.

The area of a triangle in acres 2019-06-23

Karen pose la question :
if I have a triangle that measures 78 ft x 54 ft x 50 ft, how do I figure out what part of an acre that is??
Harley Weston lui répond.

What are the next three terms? 2019-06-18

Shriya pose la question :
-6, -2 , 2, 6,10 what are the next three terms?
Penny Nom lui répond.

A tube through a board at 45 degrees 2019-06-15

Guy pose la question :
I need to insert a tube 5/8" diameter into a board at a 45 degree angle. What size hole must I drill for the tube to fit snugly?
Harley Weston lui répond.

The perimeter of 200 acres 2019-06-14

AARON pose la question :
How many feet is the perimeter of 200 acres?
Penny Nom lui répond.

Yards, feet and gallons 2019-06-12

Ralph pose la question :
How many gallons of water in a 10 yard by 10 yard container 2 1/2 feet deep?
Penny Nom lui répond.

150 litres has been drawn from a tank 2019-06-12

Eke pose la question :
When 150 litres has been drawn from a tank, it is 3/8 full, how many litres will the tank hold?
Penny Nom lui répond.

Conversions, feet, kilometers and acres 2019-06-10

Erika pose la question :
A lake has 113 feet deep and an area of 115 acres, what is the volume of the lake in cubic kilometer?
Harley Weston lui répond.

Finite and infinite sets 2019-06-10

Pretzie pose la question :
What is Finite Set & Infinite Set?
Penny Nom lui répond.

Two power generators 2019-06-07

A student pose la question :
At 100% efficiency two generators would produce 750 MW of power. At efficiencies of 65% and 75%, they produce 530 MW. At 100% efficiency, what power would each produce?
Harley Weston lui répond.

A car drives over a cliff 2019-06-06

Victor pose la question :
A car was going 90 mph towards 90foot drop. What would the distance would the car travel horizontally ,from the cliff edge?
Penny Nom lui répond.

An inline lock with four rows 2019-06-05

Edward pose la question :
I have a inline lock with four rows of numbers 0-9.The numbers cannot be repeated. Can you please print the possible codes so I can go through them one at a time. The lock and the cable cost $300. Don't want to pitch it. You guys are lifesavers, can't wait to hear back. Thanks.
Penny Nom lui répond.

3 digits from 7 digits 2019-06-02

Corban pose la question :
HOW MANY COMBINATION ARE THERE USING 3 DIGITS NUMBERS ONLY 1-7
ie 137 731 317 456 654 123 321 248
Penny Nom lui répond.

How many lines of symmetry does a circle have? 2019-05-28

raji pose la question :
how many lines of symmetry does a circle have???
Penny Nom lui répond.

Compound interest 2019-05-28

Kenneth pose la question :
Hello:

Is compound interest on $1.00 for one year the same as simple interest on $1.00 for one year?

Compound interest would be $1.01, and I believe the same amount would be the same at simple interest.
Penny Nom lui répond.

Maximize monthly revenue 2019-05-23

a student pose la question :
A real-estate firm owns 100 garden type apartments. At RM400 per month, each apartment can be rented. However, for each RM10 per month increase, there will be two vacancies with no possibility of filling them. What rent per apartment will maximize monthly revenue?
Penny Nom lui répond.

Two circles 2019-05-23

Arman pose la question :
Two concentric circles have their centres at point C. The radius of the smaller circle is 8 cm. The length of chord AB is 26 cm and is tangent to the smaller circle. What is the circumference of the larger circle?
Penny Nom lui répond.

Do all angles have to be equal to a number? 2019-05-15

Malik pose la question :
Do all angles have to be equal to a number? By all angles I mean adjacent, vertical, supplementary, complementary.
Penny Nom lui répond.

What is the original price? 2019-05-15

Tyler pose la question :
if 45% of an item is $90.00, then what is the original price
Penny Nom lui répond.

An 80 acre square 2019-05-11

Linda pose la question :
How long and wide is an 80-acre piece of land that is square?
How long and wide is a 160-acre piece of land that is square?
Penny Nom lui répond.

Pennies, nickels, dimes, and quarters 2019-05-09

william pose la question :
Ann has 177 coins (pennies, nickels, dimes, and quarters)
Her total value is $19.90
She has the same number of nickels as dimes.
She has the same number of quarters as dimes.

How many of each does she have?
Penny Nom lui répond.

Subdividing land 2019-05-09

Reuben pose la question :
This is the measurements of my plot, A-B 46.7M, B-C 193.1, C-D 198.5 & D-A 208.25 (Clockwise naming of sides) angle A at 90 degrees. My questions is how do i subdivide this plot from the bottom having lines running parallel to C-D, eg two 2acre plots. the the remaining part becomes my compound (Uper part at line A-B)
Harley Weston lui répond.

The volume of a wall 2019-05-08

Peter pose la question :
I’m building a dry stack stone wall which is 36” wide at the base, 42” tall and 24” wide at the top. What would be the volume for a 36” long segment ?
Thanks, Peter
Penny Nom lui répond.

Why Mean? 2019-05-08

Jill pose la question :
A group of teachers were trying to figure out why the”mean” is called mean - do you know??
Penny Nom lui répond.

Two numbers 2019-05-03

fds pose la question :
The difference of two numbers is 2, and their sum is 4. What are the two numbers?
Penny Nom lui répond.

Volume and Surface area of a sphere 2019-05-03

Caitlin pose la question :
Why does the surface area formula of a sphere have a squared radius while the volume of a sphere has a cubed radius?
Penny Nom lui répond.

A repeating decimal divided by a whole number 2019-05-01

Emily pose la question :
How do you divide repeating decimals by whole numbers?
Penny Nom lui répond.

If 45% of an item is 90.00 2019-05-01

Gavin pose la question :
If 45% of an item is 90.00 what is the original price?
Penny Nom lui répond.

A hemispherical bowl 2019-04-29

Innocent pose la question :
Abc is the section through a hemispherical bowl centre O radius 15cm. It contains water whose maximum depth is 8cm. What is the width of the water surface?
Penny Nom lui répond.

A circle inscribed in a triangle 2019-04-28

Daksh pose la question :
O is the centre of the inscribed circle in a 30°-60°-90° triangle ABC right angled at C. If the circle is tangent to AB at D then the angle COD is-
Penny Nom lui répond.

A dot on a child's car wheel 2019-04-28

julia pose la question :
A wheel of a child’s car revolves at 10 rpm. A painted dot on the circumference of the wheel is 12 cm from the centre of rotation of the wheel. How far does the dot travel in 5 s, to one decimal place?
Penny Nom lui répond.

The length of an arc 2019-04-28

Patrick pose la question :
If an arch is 48 inches wide at the base and 30 inches tall at its apex, what is the length of the arch?
Penny Nom lui répond.

A thread around a cylinder 2019-04-28

Ally pose la question :
A cylinder has a diameter of 3.5 cm. How many times will a thread 143mm go round the cylinder?
Penny Nom lui répond.

Two linear equations with a fraction 2019-04-26

Asha pose la question :
2x=-3y …1
x-2+-4/3(y+1) ...2

note: … is equation
Harley Weston lui répond.

Constructing a hexagonal pyramid 2019-04-25

REBECCA pose la question :
I'm doing a project for my Honors Geometry class and I have to build a regular hexagonal pyramid. I was given the volume of .75 gallons, but I don't know how to figure everything else out. Please help?
Thanks,
Rebecca
Harley Weston lui répond.

Three friend's ages 2019-04-25

Lemicio pose la question :
Janet is 10 years older than Karin, who is twice the age of Josef. If their combine age is 55, how old is each one now?
Penny Nom lui répond.

80% of an item is $200.00 80% of an item is $200.00 2019-04-25

kayla pose la question :
if 80% of a item is $200.00 what is the original price
Penny Nom lui répond.

Is every rectangle a rhombus? 2019-04-25

Danny pose la question :
Is a rectangle a rhombus??? True or False
Penny Nom lui répond.

The area of a triangle 2019-04-25

troy pose la question :
The base and the height of a right triangle are represented by the expressions below. The area of the triangle is 28 square units. Find the lengths of the base and the height of the triangle

base= x+4
height=x-6
Penny Nom lui répond.

(3d) Whether line segment intersects triangle 2019-04-13

rj pose la question :
Well hello,

Lets say I have a triangle,

Not any ordinary triangle, but a triangle that is represented in 3 dimensions. I also have a line segment.

Lets say that this triangle has points A(0,0,0), B(1,0,0), C(0,1,1)

And the line segment has points D(0,1/2,0), E(1,1/2,1)

In what way can I find if the line segment and triangle intersect? Their intersection point?

I don't prefer matrices, because they don't make any sense, but ... if that's the only way to solve this, then do what's necessary.

Thank you in advance.
Penny Nom lui répond.

An equilateral triangle 2019-04-10

ethan pose la question :
In equilateral triangle RST, R has coordinates (0, 0) and T has coordinates of (2a, 0). Find the coordinates of S in terms of a.
Penny Nom lui répond.

More on dominoes 2019-04-09

B pose la question :
A previous answer (http://mathcentral.uregina.ca/QQ/database/QQ.09.00/mark2.html) considered a method to make a line of all 28 dominoes.

Since there are an even number of each value, such a solution can be put into a circle.

Aside from the choice of starting tile, is the solution unique?
Penny Nom lui répond.

The area of a lot 2019-04-06

Robert pose la question :
Can you help me determine the rough square footage of this lot please(attached)? I think it is nearly 7000 square feet. I am sure I need the degrees of of the corners but I don’t have that. An estimate would be all I need. Thank you for you help. Rob
Harley Weston lui répond.

The height of a building 2019-04-05

Hayley pose la question :
A young man is 36 meters away from a building and looking at a bird sitting on top of the building. The man knows he is 85 meters away from the bird. How tall is the building?
Penny Nom lui répond.

4^x=2^x+6 2019-04-05

Olivia pose la question :
How do you find the (b,n) if the solution of the equation 4^x=2^x+6 can be expressed at logb(n) where b and n are both prime numbers?
Penny Nom lui répond.

Salary Plus Commission 2019-04-05

Herschel pose la question :
Fire Fighting Equipment pays salespeople as follows: $452 per week plus a commission of .9% on sales between $15,000 and $25000, with 1.1% paid on sales in excess of $25,000. Find the gross earnings for an salesperson whose Total Sales are $28,400. (No commission is paid on the first $15,000 of sales)
Penny Nom lui répond.

Percentage change in refractive error 2019-04-04

Ammara pose la question :
Hi, I'm trying to figure out how a paper I'm looking at has found a percentage from the numbers below. its a paper comparing two lenses. it says that the new lenses 'slowed the progression of refractive error by approximately 50%'.

the refractive error with the old lenses was -2.26 after two years it was -3.28

the refractive error with the new lenses was -2.24 after two years the refractive error is - 2.75
Thank you so much for your help it is most appreciated!
Penny Nom lui répond.

Internal acute angles 2019-04-02

karan pose la question :
Prove that a convex polygon cannot have more than three acute internal angles.
Penny Nom lui répond.

The volume of a pile of dirt 2019-04-01

Genevieve pose la question :
We have a pile of dirt approximately 6 feet high by 15 feet wide by 80 feet long.
We need to know how many cubic yards of dirt are in this pile. Thank you
Harley Weston lui répond.

Percentages 2019-03-30

Mari pose la question :
I am trying to find out what percentage of our worlds population does the youtuber Pewdiepie have for subscribers? So he has 91 million subscribers and there are roughly 7.53 Billion people in the world. So what percent of our worlds population does Pewdiepie have for subscribers? Am I asking this correctly? I am just curious for marketing reasons and how much of the worlds market share does Pewdiepie have for his youtube channel? I just do not know how to set up the problem to find the answer?
Penny Nom lui répond.

Three letter permutations 2019-03-26

liliana pose la question :
I need to find a three letter permutation using four letters. I have no idea how to do this. Can you help me?
Penny Nom lui répond.

The volume of water in a pipe 2019-03-21

Abati pose la question :
How can I calculate the volume of water in a pipe with below details;

Pipe diameter - 6 inches
Length of pipe - 127meters
Penny Nom lui répond.

A scale factor 2019-03-19

Miracle pose la question :
A man in a photograph is 2cm tall. His actual height is 1.8m. Write a scale statement and determine the scale factor.
Penny Nom lui répond.

Slope and percentage 2019-03-19

Tom pose la question :
I need a slope of 2 Inches every 30 feet what is the percentage to put on my pipe lazer. thank you
Penny Nom lui répond.

The area of a triangle 2019-03-19

Dylan pose la question :
The area of a triangle is 108in squared. A base and corresponding height are in the ratio 3:2. Find the length of the base and the corresponding height
Penny Nom lui répond.

A dice game 2019-03-17

Remo pose la question :
So, little game my kid came up with.

Dice are standard d6.

I roll a die, he rolls a die. If he gets the same number as me OR a bigger number he wins. So far so good. Used the opportunity to get him to calculate the probabilities of him winning, see if I could get him interested into looking at this game from a more academic perspective. He did fine.

Then we upped the ante. He rolls one die, I roll two dice. I his die has a number that is equal or greater than both of mine, he wins.
We had a bit of trouble solving that one, and had to resort to a table with all the results ( 6x36) to figure out where we stood.

Then again we upped. He rolls two dice, I roll two dice. If any one of his dice has a number equal to or greater than both of mine he wins. I only win if one of my dice is greater than both of his. And we got stuck. Figured I would need to find a formula to resolve this one, as our earlier solution ( table everything ) suddenly is 36x36, giving well over a thousand possible results. And if we ever go bigger than that then we *really* are going to need another way to calculate it.
Harley Weston lui répond.

The bearing from C to A 2019-03-15

Emma pose la question :
A is 6km due north of turbine B,
C is 4.5km due west of turbine B
Calculate the distance AC

Then calculate the bearing of C from A
Give your answer correct to the nearest degree
Penny Nom lui répond.

When is John's next birthday on a Friday? 2019-03-15

Darek pose la question :
The question is the following:
Last Friday 4th of April of 2014 John was 40 years old. How old will John be the next time when his birthday fell on Friday?
Thanks for your help
Penny Nom lui répond.

Four consecutive positive integers 2019-03-12

Nabila pose la question :
The product of four consecutive positive integers in 24024
What is their sum?
Penny Nom lui répond.

A circle with a circular hole 2019-03-11

Sue pose la question :
My little one is wondering if a circle with a circular hole could be described as an irregular semicircle.
As it has 2 sides but is not the standard shape. Could you share your thoughts ??
Penny Nom lui répond.

Converting a base six number to base three 2019-03-10

Nina pose la question :
Change 253 in base 6 to a number in base 3
Penny Nom lui répond.

A parabolic curve on a bridge 2019-03-09

monica pose la question :
how do i fint the formula for my parabola with the provided information:
the golden gate bridge has a parabola
(343,160) = coordinate
(0,0)= vertex
Penny Nom lui répond.

A triangle of maximum area 2019-03-07

Tom pose la question :
Triangle ABC is such that AB=3cm and AC=4cm.
What is the maximum possible area of triangle ABC?
Penny Nom lui répond.

Misuse of greater than 2019-03-07

Kenneth pose la question :
I have an old business mathematics textbook. The authors have indicated that the following expressions indicate multiplication:

? is 2/3 greater than 90; ? is 2/3 smaller than 90. They also indicated that the following expression would indicate division: 30 is 2/3 greater than ? and 30 is 2/3 smaller than ?.

How can these phrases indicate multiplication and division? How can 60 be 2/3 greater than 90 and also smaller than 90 as indicated above. What were the authors thinking? I have added the page from the book that indicates what I have explained in my message Kenneth
Harley Weston lui répond.

Random assignments 2019-03-02

Ninoshka pose la question :
Liu and Michi plan to sign up for a drawing class next term. Drawing is offered during the first 4 periods of the day, and students are assigned randomly to class.
What is the probability that Liu and Michi will have drawing together?
Penny Nom lui répond.

3 months loss and then a profit 2019-03-02

Ida pose la question :
Let say, I have 10k of capital and I ran business for 4 months. The first months i loss 50%, the second month i loss 50% and so do the third month. The fourth month my profit is 50%

So can I calculate the balance of money that i have out of my capital?
Penny Nom lui répond.

Double the number of pennies each week 2019-02-28

Donald pose la question :
If I save a penny a week,double it every week,How many weeks will it take to reach 1,000,000 dollars
Penny Nom lui répond.

The top half of a cone 2019-02-27

danica pose la question :
What portion of the height from top that the cone be cut into two equal volume?
Penny Nom lui répond.

4 digit codes 2019-02-27

Sophia pose la question :
How many 4 digit codes can you get out of a numbered key pad ?
Penny Nom lui répond.

A quadratic equation problem 2019-02-26

Em pose la question :
One root of the equation 2x^2 + bx - 24 = 0 is -8. What are the possible values of b and the other root?
Penny Nom lui répond.

f(x + 2) 2019-02-26

a student pose la question :
How do you use f(x) = 3x+1 to determine the transformed function of f(x + 2)?
Penny Nom lui répond.

Weighing stars and hearts 2019-02-25

Zach pose la question :
Two stars and one heart weigh 38 units. One star and one heart weigh 27 units what is the weight of each?
Penny Nom lui répond.

Running around a circular track in opposite directions 2019-02-24

carmi pose la question :
how many times will lita and rose pass each other in 15 minutes if lita and rose start jogging on a 110 meters circular track. they begin at the same point but in opposite direction. lita at 8/3 meters per second and rose at 7/3 meters per second.
Penny Nom lui répond.

Composition of functions 2019-02-24

Joshua pose la question :
Let g(x)=(x)^(2)+x-1 Find such a function f such that (fog)(x)=(x)^(4)+2(x)^(3)-3(x)^(2)-4x+6
p lui répond.

A word problem 2019-02-24

Briana pose la question :
When 4 times the number increased by 30, the answer is the same as when 70 decreased by the number. What was my number?
Harley Weston lui répond.

Loan payment formula 2019-02-24

Kenneth pose la question :
I have a question regarding the loan payment formula shown below.

Calculating the Payment Amount per Period
The formula for calculating the payment amount is shown below.

Simple Amortization Calculation Formula

A = P X r(1 + r)n over (1 + r)n - 1

where

A = payment Amount per period

P = initial Principal (loan amount)
r = interest rate per period

n = total number of payments or periods

Is this formula/calculation a condensed version of a longer calculation? I am curious to know how the (1 +r)n - 1 was developed from the longer calculation. For example, r(1 + r)n may have been (r + rn)n. The n's are exponents.

I thank you for whatever helpful explanation that may be provided.

Kenneth

Harley Weston lui répond.

The Polynomial Remainder Theorem 2019-02-23

pasandi pose la question :
f(x) is a quadratic polynomial. when f(x) is divided by (x-1),(x-2) & (x+2) the remainders respectively are -1, 4 and 2 how to find the f(x) in a question like this?
Penny Nom lui répond.

An arithmetic sequence 2019-02-23

Dalal pose la question :
If x+1 and -x+17 are the second and sixth term of a sequence with a common difference of 5, what's the value of x.
Penny Nom lui répond.

Adding and multiplying two numbers 2019-02-13

katie pose la question :
what 2 numbers add to get 7 and multiply to get 2?
Penny Nom lui répond.

Margin with commission as part of selling price 2019-02-13

Anni pose la question :
I need to find selling price to put us at 24% margin.
15% commission is based on selling price and is included in our cost.
I'm trying to do it excel and keep getting a circular reference.
Total cost= cost + commission (15% of selling price)
Selling price=total cost + 24% margin
Penny Nom lui répond.

Factoring n^2+3n-270 2019-02-11

Ashley pose la question :
n^2+3n-270
Penny Nom lui répond.

A linear equation 2019-02-11

Nick pose la question :
What's a linear equation?
Penny Nom lui répond.

5 numbers from 9 numbers 2019-02-11

John pose la question :
How many combinations of 5 numbers be created with 9 numbers?
Sample: 1,4,7,9,12. Question the same with combination of 4 from 12?
Thanks, John
Penny Nom lui répond.

A cylindrical drum 2019-02-10

Ronald pose la question :
I have a cylinder that is 32 inches round by 25 inches deep how much water can it hold
Penny Nom lui répond.

The exponential form of sqrt(13) 2019-02-10

isaebl pose la question :
what is the exponential form of sqrt(13)
Penny Nom lui répond.

Function notation 2019-02-10

Paige pose la question :
What is the difference between f(x+2) and f(x)+2?
Penny Nom lui répond.

Fractions with roots 2019-02-06

DEBMALYA pose la question :
5/√2+√3 –1/√2–√3
Penny Nom lui répond.

An ice cream cone 2019-02-05

Eyuel pose la question :
a scoop of ice cream has a 3-inch radius how tall should the ice cream cone at the same radius be in order to contain all of the ice creams inside the cone
Penny Nom lui répond.

A 4 digit combination lock 2019-02-02

Brijanshu pose la question :
I have a lock that contain only four no. 6,7,8 & 9 . How many possible password of four digit containing these Number.
Penny Nom lui répond.

A fraction of a cent 2019-02-01

michael pose la question :
$ 300 divided by 1,000,000 is 00.0003 ... so, is that three hundredths of one ($ 00.0003) cent or what ... thanks
Penny Nom lui répond.

An arithmetic sequence 2019-01-31

sara pose la question :
if the 6th term of an arithmetic sequence is 8 and the 11th term is -2, what is the first term?
Penny Nom lui répond.

One quarter of a quarter cake 2019-01-30

Tre pose la question :
1/4 of a birthday cake was left over from a party. The next day, it is shared among 4 people. How big a piece of the original cake did each person get?
Penny Nom lui répond.

Macy's coin collection 2019-01-30

Sariah pose la question :
Macy's coin collection has 2 pennies for every nickel. If she has 60 coins that are pennies or nickels, how many nickels does she have?
Penny Nom lui répond.

An equilateral triangle inscribed in a circle 2019-01-29

Penny pose la question :
What is the length of each side of the largest equilateral triangle that fits inside a 3 inch diameter circle?
Penny Nom lui répond.

y=lnx+(1+ln2)/2 and y=x^2 2019-01-28

Mike pose la question :
Prove that y=lnx+(1+ln2)/2 and y=x^2 touch each other.

The course is about logarithm and root functions... how should I solve this problem?
Penny Nom lui répond.

A scale factor 2019-01-27

Hannah pose la question :
What is the scale factor of 36 meters and 1.5 centimeters?
Penny Nom lui répond.

The sum of three consecutive even integers 2019-01-27

Pauleen pose la question :
Translate this into algebraic expression
The sum of three consecutive even integers, if x is the first even integer
Penny Nom lui répond.

The supplement of a complement 2019-01-25

Andrei pose la question :
The value of the supplement of the complement of 8° is ?°.
Penny Nom lui répond.

What angle s its own supplement? 2019-01-25

Ciara pose la question :
What is the angle of it's own supplement?
Penny Nom lui répond.

A median of a triangle 2019-01-24

Anna pose la question :
For triangle J(1,4) K(-3,-1) L(3,4), find an equation for the median from vertex J
Penny Nom lui répond.

(2018^2019)-(2019^2018) 2019-01-23

Nazrul pose la question :
Find the remainder when (2018^2019)-(2019^2018) is divided by 4? Please show me the process.
Harley Weston lui répond.

Numbering pages 2019-01-20

chungus pose la question :
It takes 852 digits to number the pages of a book consecutively. How many pages are there?
Penny Nom lui répond.

A triangle made from 12 matchsticks 2019-01-20

Palesa pose la question :
How many different types of triangles can be made with a perimeter of 12 matches?
Penny Nom lui répond.

Sale price and employee discount 2019-01-18

Margaret pose la question :
What is the formula to find the 75% off full price item that was already marked 30% off?
Penny Nom lui répond.

A cylinder with a cone on top 2019-01-16

Berania pose la question :
A water tower in New York City has the shape of a cylinder with a cone on top. The cylinder has a diameter of 12 feet and a height of 15 feet. The roof has an inclination angle of 25 degrees.
(a) Determine the height of the cone to the nearest tenth of a foot.
(b) Determine the overall volume of the tower to the nearest cubic foot.
Penny Nom lui répond.

7 spheres on a hexagonal tray 2019-01-14

herm pose la question :
what is the length of each side of a hexagonal tray, with the height of each side 0.75 inch, to hold seven spheres, each with a diameter of 3.00 inches? The spheres are placed such that each side of the hexagon is touched by one sphere at its midpoint (and the seventh sphere is place in the center of the "ring" of the other six spheres.
Harley Weston lui répond.

A binomial expansion 2019-01-05

shifali pose la question :
if the binomial expansion of (m-nx)^3 is 1+9x+-- find the values of m & n
Penny Nom lui répond.

Finance charge 2019-01-03

Kenneth pose la question :

Hello Math Central:

The calculation for determining the finance charge per $100.00 (FC/100) is determined by the following:

Finance Charge/Amount financed * $100.00 = the finance charge per $100.00

Since the denominator (amount financed) is not multiplied by $100.00, how does the result equal the finance charge per $100.00? The numerator (finance charge) is the only amount multiplied by $100.00.

Example 1. 3/4 * 6 = 18/4 not 18/24 The 4 is not multiplied by the 6.

Example 2. $49.00/$200.00 * $100.00 If $49.00 is divided by $200.00 the result is $0.245/$1.00. If $0.245/$1.00 * $100.00 = $24.50/$1.00. This answer is not $24.50/$100.00.
How does the above equal the finance charge per $100.00 when the denominator is not multiplied by $100.00?

If the division is not used to indicate the $0.245 per $1.00, the result becomes $49.00/$200.00 * $100.00 = $4,900.00/$200.00.

I thank you for any helpful reply.

..........

Kenneth

Penny Nom lui répond.

A quadrilateral inside a square 2019-01-02

Swetha pose la question :
In 2*2 square ABCD, E is the mid point of the side AD. F is a point in BE.CF is perpendicular to BE. Find the area of the quadrilateral CDEF
Penny Nom lui répond.

A rectangle problem 2019-01-01

ahamed pose la question :
In rectangle ABCD, angle BCD is trisected. CE,CF meet the sides AB,AD at E,F. BE=6cm, AF=2cm so, find the area of the rectangle ABCD?
Penny Nom lui répond.

An octagonal deer blind 2018-12-31

Alan pose la question :
My grandson and I would like to making a 6'x6' octagon floor for a deer blind. He is eight yrs old and the math is outside my wheelhouse. We need to know the length of the boards and angles of the corners please.
Thank you, Sincerely,
Alan
Penny Nom lui répond.

Two integers X and Y are selected at random 2018-12-31

Kenneth pose la question :
Two integers X and Y are selected at random from the integers 1 to 8.If the same integer may be selected twice,find the probability that;
1)X-Y=2
2)X-Y is 5 or more
3)X is greater than Y
Penny Nom lui répond.

y = f(x) 2018-12-30

yogita pose la question :
What is the actual meaning of "f(x)" ? Please give me full explanation
Penny Nom lui répond.

Non-repeating decimals 2018-12-28

Grace pose la question :
What is non repeating decimal
Penny Nom lui répond.

Solve for x in Y=1.5x + log (1+x) 2018-12-23

Asadollah pose la question :
Please restate below expression in terms of y

Y=1.5x + log (1+x)

Thanks
Penny Nom lui répond.

Ten games with two possible outcomes for each game 2018-12-22

Jin pose la question :
I'm trying to make a list to view all the possibility.
An example is if I have 2 games there's two outcomes (home/away)
I will use number to represent the teams. 0-1,2-3
All possible out comes are 0-2,0-3,1-2,1-3 right?

MY QUESTION If I have 10 games each have 2 outcomes (home/away) to win
What is all possible outcome.
0-1,2-3,4-5,6-7,8-9,10-11,12-13,14-15,16-17,18-19
Could u please provide me with a list of all possible out comes

Thanks you
Penny Nom lui répond.

The surface area of a dome 2018-12-18

Chithrabhanu pose la question :
If a dom dia is 4.552 and the height is 1.21 what is the surface area?
Penny Nom lui répond.

cos(2x) = sin(x) 2018-12-18

Liz pose la question :
Determine all values of x in [0,2pi] that solve the equation Cos(2x)=sinx
Penny Nom lui répond.

Simultaneous equations with fractions 2018-12-14

zaheer pose la question :
solve simultaneous equations and give answer in fractional form
3x - 2 = 4y +5/3
y + 7 = 2x + 4
would really appreciate some help on this please
Penny Nom lui répond.

The height of a tower 2018-12-12

Pandey pose la question :
Hello sir plz solve this question. If the shadow of a tower is found to be 10.5m longer when the sun's altitude is 45°AND60°. Find the height of the tower.
Penny Nom lui répond.

An open top box 2018-12-12

Kirklan pose la question :
Jeremy wants to construct an open box from an18-inch square piece of aluminum. He plans to cut equal squares, with sides of x inches, from each corner and then fold each side up to form the box. If Jeremy wants the volume of the box to be 432 cubic inches, what should the minimum length of the sides of the squares cut from each corner be? Find the volume, V, of the box as a function of x. Given: V = length × width × height.
Penny Nom lui répond.

The area and weight of sod 2018-12-11

Susan pose la question :
I have equipment that will cut sod 30 inches across and 75 Feet in length? how much will this be in square foot age ? Yards? Approximate weight?
Penny Nom lui répond.

Angular velocity 2018-12-05

Kolade pose la question :
Krusty the Clown and Sideshow Bob have covered themselves in velcro, and shot themselves out of a large cannon so that they stick to a huge rotating velcro wheel (don’t try this at home). As shown in Figure 1(a), Krusty is now stuck to a point 3.00 m from the center of the wheel while Bob is stuck to another point 5.00 m from the center. The wheel is rotating counterclockwise at 10.0 rpm. Conveniently a set of axes is suspended just in front the wheel (Krusty asked for axes, like the ones you would use to chop wood, so that he and Bob could chase each other with them in the usual wholesome entertainment he is known for. Unfortunately, the set designer misunderstood.) The axes do not rotate with the wheel.
(a) Find Krusty’s and Bob’s angular velocities, in radians per second.
Penny Nom lui répond.

A puzzling equation 2018-12-04

Manny pose la question :
Hello,

Can you explain why this is wrong:
-1 = (-1)^3 = (-1)^{6/2} = ((-1)^6)^{1/2} = (1)^{1/2} = 1 ??

Thank you
Penny Nom lui répond.

A square and a triangle 2018-12-03

Livvy pose la question :
a square with a perimeter of 48 and a triangle with a perimeter of 38. when they are joined they make a pentagon. please find the perimeter
how can you find the perimeter of this. could you please help me?
Penny Nom lui répond.

The top of a truncated cone 2018-12-02

Sameer pose la question :
Bottom cone radius 1124.height is 200. Top radius 15degree decree to bottom radius. Top radius how much ?
Penny Nom lui répond.

How many solutions does 3 (x + 4) = 3 x + 4 have? 2018-12-01

Milan pose la question :
how many solutions does 3 (x + 4) = 3 x + 4 have?
Penny Nom lui répond.

Four digit numbers from 0, 1, 2 and 3 2018-11-30

A parent pose la question :
how many four digit numbers can be formed using nos.0,1,2,3 if repetition is allowed?
Penny Nom lui répond.

y = |x| - 1 2018-11-30

alexis pose la question :
what does this mean y=|x|-1
Penny Nom lui répond.

Two cones formed from two circular sectors 2018-11-30

APARNA pose la question :
The central angles of two sector of a circle are 60° and 120° . Using these sectors two cones are made. If the radius of the smaller cone is 5 cm, find the radius and base area of the larger cone.
Penny Nom lui répond.

0.025% of 575 billion 2018-11-28

JoAnne pose la question :
What is .025% of 575 billion dollars?
Penny Nom lui répond.

Ordering fractions 2018-11-25

Mae pose la question :
order these from least to greatest:

19/6, 3 5/14, 83/21
Penny Nom lui répond.

1 acre by 3 inches deep 2018-11-23

Cheri pose la question :
How many yards of soil does it take to cover 1 acre in 3 inches of soil?
Penny Nom lui répond.

Divisibility by 3 2018-11-20

Ray pose la question :
There is a rule that a number is divisible by 3 if the sum of its digits are divisible by 3 (for example, 81=8+1=9 {divisible by 3} and 33=3+3=6 {again, divisible by 3}) I know this works but I don't know why! Please help.
Penny Nom lui répond.

Terry was two-thirds as old as Nia 2018-11-19

Makenzy pose la question :
four years ago, terry was two-thirds as old as nia. now terry is three-fourths as old as nia. how old is each now
Penny Nom lui répond.

What was the original number? 2018-11-18

jaydaleigh pose la question :
Mark was thinking of a number. Mark adds 11 to it, then doubles it and gets an answer of 40.5. What was the original number?
Penny Nom lui répond.

Percentage markup 2018-11-17

Sher pose la question :
Cost price is $32,500 and selling price was $ 85,495.25, what percent markup was made?
Penny Nom lui répond.

2/5 as much time 2018-11-16

Izzy pose la question :
If Patricia spent 3/8 of her time cleaning her room. She spent 2/5 as much time washing the dishes as she did cleaning her room. What fraction of time did Patricia spend Washing dishes? And it wants us to simplify our answer
Penny Nom lui répond.

-4 + 3/2 2018-11-15

Chloe pose la question :
so I have this paper and I'm confused, -4 + 3/2=???? so I originally got -1/2 but I looked at Calculator papa and he says -5/2 and then I looked at google and all I got was -2.5 and i am so confused and lost.
Penny Nom lui répond.

Price before VAT and a discount 2018-11-15

Carol pose la question :
I bought a computer for £330.
The selling price included VAT at 20%.
Then I was allowed a staff discount of £30.
What was it’s original price before the VAT and staff discount?
Penny Nom lui répond.

The original cost when you only know a percentage 2018-11-13

john pose la question :
I was wonder how to find the Original cost when you don't know original cost

The amount paid was 13.82 that is suppose to represent 20% because Insurance pays 80% Thank You
Penny Nom lui répond.

A line cuts a curve 2018-11-11

roxanne pose la question :
Hello, i need to ask a question, do you mind explaining and writing the formula of how to solve equations such as "find the set values of k for which the line y-2x-5 cuts the curve y=x^2 +kx+11" please
Penny Nom lui répond.

The price of eggs rises 10 cents per dozen 2018-11-10

Maddie pose la question :
Hi! I'm currently struggling with a word problem that says: "If the price of eggs rises 10 cents per dozen, one will be able to get 2 dozen fewer eggs with $6.00 than was possible at the lower price. What is the lower price? We are working on completing the square and all of the problems I've done so far in this chapter require using that method. If possible and needed, could you explain how to set up the equation? Thank you so much! I appreciate all your help!!
Penny Nom lui répond.

Speed 2018-11-06

Dolores pose la question :
if I drove 3/4 mile in 32 seconds, what was my speed ?
Penny Nom lui répond.

Dividing by a fraction 2018-11-02

Fadely pose la question :
If 8 divided by 4/2 can be expressed as 8 X 2/4, how can 8 X 2/4 be converted back to 8 divided by 4/2?
Penny Nom lui répond.

Why 1/2 in the area of a circular sector? 2018-10-26

Ariel pose la question :
In the equation for area of a sector=1/2r^2theta why is it 1/2? Please explain conceptually not algebraically.
Penny Nom lui répond.

Why 1/3 in the volume of a cone? 2018-10-20

Keith pose la question :
In the formula for the volume of a pyramid, Volume = 1/3 * base * height, where does the 1/3 come from, intuitively?
Penny Nom lui répond.

f(x) and f(-x) 2018-10-19

Simran pose la question :
what is difference between f(x) compared to f(-x) on graph
Penny Nom lui répond.

Angular speed 2018-10-18

Akidima pose la question :
A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 seconds . What is the average angular speed of the wheel
Penny Nom lui répond.

Filling a candy box 2018-10-16

Stephanie pose la question :
My child had the question: A candy box has the following measurements. 10x6x4Find the total volume. (We got that one right 240in3) But... then it said “How many 1/2 inch cubed pieces of candy can fit in the box? This is where we disagree. Please help.
Penny Nom lui répond.

Covering 6 acres with dirt 2018-09-27

Scott pose la question :
How many cubic yards of dirt would come from 6 acres, 6 ft. deep?
Penny Nom lui répond.

The area of a trapezoid 2018-09-24

An other pose la question :
AB-272 feet: AC 690 feet; CD-330 Feet; DA-669Feet Calculate the area in feet and Acres.
Penny Nom lui répond.

Two curves 2018-09-23

Megan pose la question :
How do i find the interception points of xy=-2 and y=x+3? Many thanks!
Penny Nom lui répond.

The point-slope equation for a line 2018-09-23

Sally pose la question :
The equation of the line in point-slope form for the line passing through the point ( 4, -6) and parallel to the line y = -6x + 2. Describe the steps.
Penny Nom lui répond.

An inequality with no solution 2018-09-20

Alena pose la question :
I'm trying to help with a homework problem. Can you please help me?

2kx - 3k < 2x + 4 +3kx

We are solving for "k" with no solution.
Penny Nom lui répond.

Compatible numbers 2018-09-19

Jessica pose la question :
Hello, I'm having trouble helping my daughter she is in 5th grade and I tell you her math is so much different then the math I learned in school and I been out of school for quite some time so it's a little hard for me.
Anyway her math is very confusing for me they are saying use compatible numbers to find two estimates.
I have no idea what that even mean I tried using Google but still don't get it . The problem is 12 divided by 478 using compatible numbers to find two estimates.... please help
Penny Nom lui répond.

The sum and difference of two numbers 2018-09-17

Feni pose la question :
The sum of two numbers is 4. The difference of the two numbers is 2. What are the two numbers?
Penny Nom lui répond.

A gas and oil mixture 2018-09-16

April pose la question :
For a new motor bike, the recommended ratio of gas to oil is 27:1 by volume. How much gas and how much oil are needed to fill a 14 L tank on a new motor bike?
Thank you
Penny Nom lui répond.

Predicting the number of fish in a lake 2018-09-16

April pose la question :
A researcher catches 30 fish in a pond, attaches a marker to their fin and releases them. The next day she places a large net in the water and catches 9 fish. 3 have the marker attached to their fin. Can she predict the number of fish in the pond???
Thank you
Penny Nom lui répond.

The volume of a hotel soup pan 2018-09-15

Melanie pose la question :
If the hotel pan measures 12 inches long x 5 inches wide x 6 inches tall, how many quarts of soup will the hotel pan hold?
Penny Nom lui répond.

Velocity 2018-09-14

Adrian pose la question :
If Jill was traveling at 300 miles in 4 hours due South what was his velocity in miles per second.
Penny Nom lui répond.

Covering a region with black Mexican Rock 2018-09-14

Lenton pose la question :
I have a 48 sq. feet area that I need to cover.

How many cubic ft would I need to cover 48 sq. ft.?
Penny Nom lui répond.

Exponential form 2018-09-14

Saquanna pose la question :
What is 25 in exponential form
Penny Nom lui répond.

Splitting a commission 2018-09-13

Beth pose la question :
If Sales Prices is $170975 and commission is 6% but listing agent gets 60% of the 6% and selling agent gens 40% of the 6% what is the actual percentage that each would actually receive?
Penny Nom lui répond.

Fixed cost 2018-09-13

Heather pose la question :
On the bus question you answered, what would be the fixed rate? Is that the rate per person or is that also the base rate? ( cost of empty bus)?
Penny Nom lui répond.

Exponential form 2018-09-12

Grace pose la question :
hi, I can't figure out how to do 735 in exponential form. note that im only in 5th grade and its not supposed to be in the scientific notation or whatever. okay, thanks!
Penny Nom lui répond.

A locus of points 2018-09-03

Ericka pose la question :
Find the locus of points three times as far from (0,4) as from (2,0)
Penny Nom lui répond.

Golf schedule for 12 players over 8 days 2018-09-03

William pose la question :
We have a golf trip with 12 golfers

we are playing 8 rounds together......we want to mix the group up at best possible w/o too much overlap.......
thoughts? the math is way over my head...

even if we play the first 6 rounds with different partners, then the last 2 can be repeats ...or whatever the math works out
Penny Nom lui répond.

A 3500 acre ranch 2018-08-30

Dee pose la question :
I am in the middle of writing the description of the size of a ranch in my story. It is 3500 acres. How does that equate into mileage? The main ranch house is at one end, and the foreman's ranch house at the other end.
Penny Nom lui répond.

The sum and difference of two numbers 2018-08-30

Saranya pose la question :
Hi,

The question is to find the numbers from sum and difference.
The Sum = 14 and the difference = 2

I found in this web site some useful answers. but my kid is going second grade only. She don't know how to do a division or multiplication.
So can you please explain on how to find the answer using only the Addition and Subtraction.

Thanks in advance.
Penny Nom lui répond.

Working with percentages 2018-08-26

Kenneth pose la question :
16 is 4% of what amount? The answer can be determined by the following unusual manner: 4% = 16 1% = 4 100% = 400 Can the following solutions for the following be determined by using the same type of calculation? 16 is ?% of 400 ? is 4% of 400 I thank you for your reply.
Penny Nom lui répond.

Robbie and fran run laps 2018-08-26

khansa pose la question :
robbie runs 3 laps for unknown number of days. fran runs 3 times as many laps each day for unknown number of day. what is the formula for their combined total number of laps
Penny Nom lui répond.

A rotating wheel 2018-08-24

Kay pose la question :
A wheel with a radius of 7 inches is rotating at 4 revolutions per second. What is the linear speed v, in feet per second?
p lui répond.

Two intersecting tubes 2018-08-15

Tommy pose la question :
Hi, I am trying to determine a mathematical model for two metal tubes joining at various degrees for weld.
For instance, if I am trying to join the end of a tube to the side of another at a 90 degree angle, it will be a simple profile cut out of the joining tube.
Where it gets tricky is if you want to join the new tube at a given angle.
It would be very helpful if you could give insight as to how I can solve this problem or an equation I could work off of.
Thanks for the help!!
Edward Doolittle lui répond.

Two spinners 2018-08-13

Atina pose la question :
A spinner has four equal sectors and a number is written on each sector; 1, 2, 3 and 4. A two-digit number is formed by spinning two times. The number on the first spinning makes the first digit and the number on the second spinning makes the second digit. For example, 2 on the first spinning and 1 on the second spinning make the number 21.
(a) Give the sample space S for the experiment.
(b) Consider the following events : E = odd number; F = number smaller than 35; G = prime number. Give the subset of outcomes in S that defines each of the events E, F, and G.
(c) Describe the following events in terms of E, F, and G and find the probabilities for the events.
• getting an even integer less than 35.
• getting an odd number or an prime.
• getting an even number greater than or equal to 35 that is a prime number.
• an odd number smaller than 35 that is not a prime number.
(d) Are E and F mutually exclusive events? Give a reason for your answer.
Penny Nom lui répond.

A cube in a cylinder 2018-08-13

Geli pose la question :
A cylinder with a radius r and height 2r+4 contains a cube with edge length r√2. What fraction of cylinder volume is taken up by the cube
Penny Nom lui répond.

Amy and Joey on a circular track 2018-08-13

Zoe pose la question :
Amy and Joey are situated on a circular track 400 feet around.
Joey starts running at a rate of 10 feet per second.
Amy waits for a full minute, then starts running from the same point (in the same direction) at 12 feet per second.

How many seconds elapse before Amy passes Joey on the track?
Penny Nom lui répond.

Exponents 2018-08-13

Ella pose la question :
What is the radical form of 3xy raised to 5 quantity three- fifths?
Penny Nom lui répond.

Form a cone from a circle sector 2018-08-12

Tinashe pose la question :
A 216 sector of a circle of radius 5cm is bent to form a cone. Find the radius of the base of the cone and its vertical angle.
Penny Nom lui répond.

5 mm of water over 1 hectare 2018-08-10

Joyce pose la question :
Please help me with this question.
How many tonnes of water fell on 1 hectare of land during a rainfall of 5mm?
Penny Nom lui répond.

Truncated cones 2018-08-08

Belgacem pose la question :
Hello, I have a truncated cone: height 500mm , Base radius=147mm and I want to calculate the Top surface radius. How to do that? thank you
Penny Nom lui répond.

Paving stones area 2018-08-08

Declan pose la question :
I am thinking of buying some reclaimed block paving stones. There are 750 pieces in total.
60% are L- 140mm x W -140mm x H-50mm
40% are L-170mm x W-140mm x H-50mm How much area will this cover?
Penny Nom lui répond.

The record for a soccer team 2018-07-20

Payal pose la question :
A soccer team plays six games in one month. Each game results in a win, loss, or tie.

For this soccer team, how many different sets of results are possible for the six games?
Penny Nom lui répond.

How many students passed the test? 2018-07-20

florian pose la question :
In Mr. Edgecomb's math class, 30 students took an exam on statistics. If the average passing grade was 84, the average failing grade was 60, and the overall average was 80, how many students passed the test?
Penny Nom lui répond.

Linear feet and cubic feet 2018-07-16

Dave pose la question :
How do I convert: 1 foot wide x 15 inches high x 19 inches deep

We are trying to figure out how to convert the linear footage into cubic footage the above are the figures represent just 1 linear feet of several thousand

Any thing helps,

Thanks in advance

Dave
Penny Nom lui répond.

A sulphuric acid solution 2018-07-12

Tan pose la question :
How much 96% h2so4 to add into sulphuric acid 30% in order to make it to 50% sulphuric acid?
Penny Nom lui répond.

A circle inscribed in a regular polygon 2018-07-12

Naveen pose la question :
The radius of inscribed circle for n sided regular polygon of a side a is? Please with proof
Penny Nom lui répond.

The price of a watermelon 2018-07-07

errin pose la question :
the price of the watermelon is directly proportional to its weight. If a watermelon that weighs 22 pounds cost $5.40, how much will a 17.5 pound watermelon cost?
Penny Nom lui répond.

Four odd factors 2018-07-04

Manchali pose la question :
Find a number that has 4 factors and all of them are odd numbers.
Penny Nom lui répond.

The surface area of a levee 2018-07-04

John pose la question :
Figuring out the surface area in sq. Ft. Of a levee

Height:10’
Top of levee width: 6’
Width of base (from toe to toe): 40’
Length of levee: 1,250’
Penny Nom lui répond.

Creating a number sentence 2018-06-29

trish pose la question :
First I have to solve the problem. Then write a number sentence for the problem. The problem: By installing a $120.00 thermostat that reduces the temperature setting at night a family hopes to cut its annual fuel bill for heating oil by 8%, and recover the cost of the thermostat in fuel savings after 2years. What was the family's annual fuel bill before installing the thermostat? Thanks can't figure this one out!
Penny Nom lui répond.

Soil in a raised bed 2018-06-24

Georgia pose la question :
Good Afternoon,

I'm planning on building a raised bed garden measuring 6 feet long x 4 feet wide x 12 inches deep. I'm not sure how to calculate the amount of soil to fill it up. I will have to purchase the soil in 2 cubic feet bags.

I've read several articles about this topic on various gardening websites, and one of them stated it would take a ton of soil to fill up an 8 foot long x 4 foot wide x 12 inch deep raised bed garden.

I'd greatly appreciate it if you could help me out with this quandary.

Thank you for your prompt and courteous response.

Kind Regards,
Georgia
Penny Nom lui répond.

Three consecutive whole numbers 2018-06-22

whaha pose la question :
the sum of three consecutive whole numbers divided by 4 is equal to 6. find the numbers.
Penny Nom lui répond.

The product of two numbers 2018-06-19

amie pose la question :
the product of two numbers is 108.when the larger number is divided by the smaller number the quotient is 3. What are the number.tnx
Penny Nom lui répond.

The domain of f(g(x)) 2018-06-18

Joshua pose la question :
What are the restrictions of the domain of f(g(x))?
Penny Nom lui répond.

A question about the empty set 2018-06-17

Andrey pose la question :
Hello there!
I got that an empty set is a subset of every set.
There is a question.
Is an empty set an element of every set?
∅ ⊆ {x}True
∅ ∈{x}?
Sorry if the question is easy. A set theory is a bit confusing.
Penny Nom lui répond.

The number of terms in an arithmetic sequence 2018-06-15

Don pose la question :
how many terms in arithmetic sequence are there if the first term and the last term are 3&59 respectively in common difference is 4?
Harley Weston lui répond.

The base for a circular pool 2018-06-10

Adam pose la question :
How many sheet of 4ft by 8ft foam would I need to lay under a pool 15dt in diameter
Penny Nom lui répond.

A tangent to a circle 2018-06-10

Bellle pose la question :
Determine the equation of the circle which has its center at (3,1) and tangent 3x-4y+5=0
Penny Nom lui répond.

The inverse square law 2018-06-05

Amy pose la question :
Question about inverse square law ;

Hi, I'm trying to understand some nuances about this law and
have been reading about it a lot online and trying out some homework
for personal interest (hobby ) - not school related.

I understand that the simple formula is ; 1/d^2

I was wondering about what appears to be an oddity to me, that
I came across when I was working with a test example I found at this
link ;

http://www.softschools.com/formulas/physics/inverse_square_law_formula/82/

The problem that caught my interest was this one on that page ;

"1) If a bright flashlight has a light intensity of 15.0 candela at a distance 1.00 m from the lens, what is the intensity of the flashlight 100.0 m from the lens?"

So I have a few different questions about this, but the most important
one is, what does it mean if we replace the "1" in ; 1/d^2 with a different value such as a ratio in the form of a decimal value, so instead we have something like this ;

0.75/d^2

???

Does this ratio represent a curve then?

I am thinking that the "1" in the normal formula represents a straight line

Some of the links I was researching ;

http://wisptools.net/book.php?c=3&s=2

http://www.softschools.com/formulas/physics/inverse_square_law_formula/82/

https://www.nde-ed.org/GeneralResources/Formula/RTFormula/InverseSquare/InverseSquareLaw.htm

Penny Nom lui répond.

Are those two equations the same? 2018-06-05

Francisco pose la question :
Solve for y: 2(x+3)=y x=5
Solve for y: (x+3)2=y x=5
Are those two equations the same?
Penny Nom lui répond.

The difference between two numbers is -3 2018-06-05

Hannah pose la question :
write a pair if integers whose difference is -3 ( given that the greater number is 8 )
Penny Nom lui répond.

The volume of a berm 2018-06-04

Mike pose la question :
Have a berm that is 700’ long, 29’ y’all and needs a 20’ top with 5-1 slope on one side and 3-1 slope in the other
Penny Nom lui répond.

Two odd integers 2018-06-04

Pleroma pose la question :
The product of two alternate odd integers exceeds three times the smaller number by 12. What is the larger number?
Penny Nom lui répond.

$96 is 66 2/3% of what dollar amount? 2018-05-31

mary pose la question :
$96 is 66 2/3% of what dollar amount?
Penny Nom lui répond.

Taking 6 pills 2018-05-29

Dave pose la question :
My motives are simple, I want to get revenge on my brother who, unbeknown to me, repeatedly cheated when we played on-line Scrabble! Can you help? - he has posed this question knowing that I'll struggle to get the solution. Question: He is taking 6 pills a day, if he takes the pills in a different order each day, how long will it be before he takes the pills in the same order on the same date again? I think leap years might come in to it! Will I confess to using you guys? - I'll think about that one.
Penny Nom lui répond.

Monthly Pension 2018-05-28

Kenneth pose la question :
Hello:

I have a question regarding how the units cancel in the following:

A company uses the following calculation to determine the monthly payment for its employees as they retire:

1.1% * average 5 years highest salary * years of service

If an employee worked 33 years and his average 5 year salary is $30,705.17, what is his monthly payment?

I used the following to determine his monthly payment, but I am not sure how the units cancel especially the years.

1.1% * $30,705.17 * 33 years divided by 12 months/year

I determined his payment as $928.83 per month, but the year units do not cancel unless the 1.1% is per year.

Is the correct calculation 1.1%/year * $30,705.17 * 33 years divided by 12 months/year so that the units cancel properly?

The $\$30,705.17$ is an average for 5 years of working. It is not $30,705.17 per year.

I thank you for your assistance.

Penny Nom lui répond.

What is the diameter of the observable universe? 2018-05-27

peter pose la question :
The diameter of the observable universe is calculated to be 92 billion light years. What would that distance be in miles given a light year is 6 trillion miles?
Penny Nom lui répond.

An equation with rational coefficients 2018-05-26

Anagh pose la question :
If x and y are rational number and
(x+y) + (x - 2y)√2 = 2x -y + (x-y-1) √5

Then find the value of x and y.
Penny Nom lui répond.

Converting inches to centimeters 2018-05-25

Jason pose la question :
Hi!
Is there a method to approximately convert inches to cm in my head without using a calculator?

Thanks! Jason
Penny Nom lui répond.

Pre tax and post tax percentages 2018-05-22

Tom pose la question :
Hi,
I work in a clothes shop which can also do mail-orders. My Head Office has sent a report with which we can check the records we keep in store tally with those at HO.

According to that report we have taken £2578.25 in orders, excluding VAT (20%), which would therefore be £3093.91 including VAT (2578.25+20%=3093.91).

According to my records, we have taken £3179.32 including VAT, which would be £2543.45 excluding VAT (3179.32-20%=2543.45).

Why is it that the difference between the VAT inclusive figures (3179.32-3093.91) is +£85.41, but the difference between the VAT exclusive figures (2543.45-2578.26) is -£34.81?

Now, I can see from the report that 1 order has not been recorded by HO, and I know that our average order value is around £30, so the -£34.81 makes sense. But surely both figures should be a minus, regardless of whether they include VAT?

I'm sure there is an obvious answer, but I just cannot see it! Any help would be gratefully received.
Thanks,
Tom
Penny Nom lui répond.

The area, radius and slant height of a cone 2018-05-18

joette pose la question :
If you have a cone how to find the slant height when given the area and radius?
Penny Nom lui répond.

Making a cylinder from a metal plate 2018-05-18

Rahul pose la question :
I want to make a cylinder which inside diameter is 600mm and thickness is 5mm and height is 800mm...so my question is that how much plate I need to make this happen
Penny Nom lui répond.

Write these fractions from greatest to the least 2018-05-18

angela pose la question :
math fraction greater to the least

1\5 ,1\2 or 1\4
Penny Nom lui répond.

4 digit "combinations" 2018-05-18

Marvin pose la question :
I am designing a game, and I need away of figuring this out without having to write numerically all these numbers

4 digit combinations 0 through 13 non-repeating
Penny Nom lui répond.

mg to ml 2018-05-17

Carolynne pose la question :
I need to convert 12 mg to ml
density is 12.5mg/5ml
I can give dose of 1mg per pound . My dropper is in ml.
How much in ml can I give
Penny Nom lui répond.

Subdividing a rectangle into squares 2018-05-13

jeverzyck pose la question :
A rectangular board is 108cm wide and 156 cm long Equal squares as large as possible are ruled off this board.Find the size of the square.How many squares are there?
Penny Nom lui répond.

Rods,poles and perches 2018-05-13

roy pose la question :
i have some land and its measured in rods poles and perches
how cann i convert to understand it more
Penny Nom lui répond.

Two expressions for the perimeter of a a rectangle 2018-05-13

Slayde pose la question :
A rectangular house has one side 4 metres longer than the other. Create two different expressions for its perimeter. The expressions should be given in factorised and expanded form.
Penny Nom lui répond.

An egg falls from rest 2018-05-10

Amy pose la question :
An egg falls from rest a distance of 75cm to the floor. Neglecting air resistance, at what speed does it hit the floor?
Penny Nom lui répond.

An unknown number 2018-05-10

David pose la question :
Sam chose the number 35 and made up these clues."my number is odd. It is a multiple of 5. It's other factor is greater than 5. My number is less than 40. What is my number and what is it's other factor? Are Sam's clues correct?
Penny Nom lui répond.

The square root 3 in exponential form 2018-05-09

Paige pose la question :
how do you write the square root 3 in exponential form
Penny Nom lui répond.

Converting decimals to common fractions 2018-05-08

Ruth pose la question :
what does the 0 represent in .018 versus the decimal .180? As in, changing these to fractions? Thank you.
Penny Nom lui répond.

The volume o a hemisphere 2018-05-06

Sambox pose la question :
When I have a hemisphere with a volume of 700Pi m^3 what is the radius?
Penny Nom lui répond.

Soccer fans and cricket fans 2018-05-06

Chibo pose la question :
In a survey of 60 sport fans, 45 enjoy soccer, 35 enjoy cricket and 10 do not enjoy either soccer or cricket, but some other sports.What percentage of sports fans enjoys both soccer and cricket?
Penny Nom lui répond.

A fraction 2018-05-02

Adwin pose la question :
The denominator of a rational number is greater than its numerator by 8. If the numerator is increased by 17 the number obtained is 3 by 2. Find the number.
Penny Nom lui répond.

Gauss' Addition of whole numbers. 2018-04-30

Brad pose la question :
I found this on your site. Question: what is the sum of the first 100 whole numbers?? Is there a different formula if the numbers begin at a number other than one? For example What is the series I want to add is goes from 7 - 53?
Harley Weston lui répond.

Spreading soil over 10 acres 2018-04-29

Joe pose la question :
If you have 54000 cubic yards of soil and want to spread it over 10 acres of land, by how many inches would the ground level rise?
Penny Nom lui répond.

The weight of a cylinder 2018-04-27

Jared pose la question :
What is the formula for the weight of a cylinder (not hollow) made of cast iron if it has a height of 5.25 inches and a diameter of 1.75 inches?
Penny Nom lui répond.

Throwing a football 2018-04-26

Abby pose la question :
Daring Danny's threw a football at an angle of 40 degrees to the horizontal. The football hit the ground at 36 feet. Danny is 5 feet 1 inch tall. Find the initial velocity

I have been trying to figure this problem out for forever! Please help! I am really confused because I don't know time either and you are supposed to find that as well as velocity.
Penny Nom lui répond.

A rectangular prism with rounded corners 2018-04-25

Jackie pose la question :
Rectangular prism that is 40 by 20 with rounded corners with a radius of 2.5.

What would the surface area be?
Penny Nom lui répond.

More on the curvature of the Earth 2018-04-23

will pose la question :
the formula for figuring the earth's curve goes against logic, looking at a fixed point and backup 1mi. the point drops 8" then 16" in the next mi. and 32" in the third mi. why shouldn't it be 24" why is the 8" per mi. squared can you tell me in laymens terms why this is it goes against logic it would seem the correct wat would be to add up 8" per mile as you back up from the fixed point 8"- 16"- 24"- 32" not 8/16/32/64"
Harley Weston lui répond.

Seven tangent circles 2018-04-23

Domenick pose la question :
How to calculate the circumscribed and inscribed circles formed by seven .019685 diameter circles arranged in a circle with all seven circles tangent to each other?
Penny Nom lui répond.

A volume expression for a pyramid 2018-04-23

Shaheer pose la question :
Do a three sided pyramid and a square pyramid have the same formula if you want to calculate the volume?
Penny Nom lui répond.

The distance between two men 2018-04-21

Kristin pose la question :
If a 5 ft 6 in man gets hit at a downward 45 degree angle by a 5 ft 10 in man, how far apart are the two men? AND, would the shorter man have to be kneeling or standing? Is there a formula and answer for this question?
Penny Nom lui répond.

Nickels, dimes, and quarters 2018-04-20

Patti pose la question :
A copy machine accepts nickels, dimes, and quarters. After 1 hour, there are 30 coins total, and their value is $5.10. How many nickels, quarters, and dimes are in the machine? (Hint: There are exactly five different solutions.)
Penny Nom lui répond.

How to find the area of triangle? 2018-04-19

g.a pose la question :
how to find the area of triangle
Penny Nom lui répond.

A cone formed from a circular sector 2018-04-18

Jessica pose la question :
A circle has a radius of 7.5cm. A sector with an angle of 240 degrees is cut out from the sector. If the sector is folded to form a cone. Find the length of the cone.
Penny Nom lui répond.

Pool Digit Combinations 2018-04-18

Jacob pose la question :
I need to know all the possible 3 digit combinations from the following pool of digits: 1st pool (1,2,3), 2nd pool (4,5) and the 3rd pool (7,8,9,0). Each pool has to be represented in the combinations.
The numbers can be repeated as long as they are not of the same set. Example for not repeating: 123 is ok but not 321 or 231,132,213, etc.

The question is somehow related to Mike's but the difference is the digits are allocated into pools. Your help can assist me solve a mystery. Thanks.
Penny Nom lui répond.

A circle inscribed in a quarter circle 2018-04-16

abhijeet pose la question :
ABC is a quarter circle and a smaller circle is inscribed in it. if AB = 1cm then find the radius of smaller circle
Penny Nom lui répond.

A triangle in a cube 2018-04-16

Sohel pose la question :
A cube has an edge of 4 cm. A triangle is formed by joining the middle point of one face of the cube to the ends of a diagonal of the opposite face . What will be the area of the triangle ?
Penny Nom lui répond.

What is small four-digit whole number? 2018-04-15

Rajesh pose la question :
What is small four-digit whole number?
Penny Nom lui répond.

The angles of a trapezoid 2018-04-14

Gautham pose la question :
In trapezoid ABCD, sides AB and CD are parallel, \angle A = 2angle D, and angle C = 3angle B. Find angle A.
Penny Nom lui répond.

The mass of a durian 2018-04-14

REEVASSHINIE pose la question :
A watermelon with a mass of 5 kg and two durians with the same mass are placed on an electronic balance.If the reading shown on the balance is m kg,write an expression for the mass of a durian
Penny Nom lui répond.

The length of a diagonal of a box 2018-04-13

Valentina pose la question :
A packaging box for a metal rod is 7.5 inches along a diagonal of the base the height of the box is 18 inches what is the lengh of a diagonal of the box?
Penny Nom lui répond.

Covering a region with mulch 2018-04-13

Roberta pose la question :
I have a fall zone area of approx. 700 sq ft. that I have to cover with a 6in depth of mulch. How much mulch would I need to purchase?
Penny Nom lui répond.

Division and remainders 2018-04-12

Yogendra pose la question :
A number is divided by 5,7 and 9. Reminder are 1,2 and 3 respectively. What is the number?. Give suitable calculations.
Penny Nom lui répond.

Graham's money box 2018-04-12

Tasnim pose la question :
Graham's money box consists of sh.10 and sh.5 coins. There are 24 coins and it's total value is 150. Find how many of each coins are there in the box
Penny Nom lui répond.

The sides of a circle 2018-04-10

Reid pose la question :
Hello,
I recently was wondering about whether or not a circle has an infinite number of sides, and I ended up searching it on your website. I saw that you guys found the question to be too ambiguous or something of that nature, and I thought about your process of reasoning involving vertices and such. I soon realized that I may have come up with the solution to the question, but I want to confirm it with you guys. Allow me to explain:
A circle, unlike any other typical 2 dimensional polygon, can sustain an infinite number of straight lines coming in contact with only one point on it. A square, for example, cannot. A square only has 4 locations that can sustain a such a line, each of those being its corners. The flat edge of a square cannot support a tangential line, because the line would either be crossing the edge of the square or coming into contact with multiple points along its edge.
This concept is consistent in every 2 dimensional polygon: pentagons sustain 5 locations for tangential lines, hexagons 6, nonagons 9, etc. The reason a circle has an infinite number of sides is simply the fact that it must have an infinite number of "corners", assuming it can be defined as a polygon like any of the shapes I described above.
Corners can only exist assuming there is two sides coming into contact with one another. If there is an infinite number of corners in the circle, which is apparent due to the above reasoning, there must be an infinite number of sides coming into contact with each other. Thus, a circle is a polygon that consists of an infinite number of sides coming into contact with each other.
Please review this reasoning and let me know if it is solid.
Thank you!
Penny Nom lui répond.

Rolling 2 dice 2018-04-06

Jose pose la question :
Find the probability p that the sum is as stated when a pair of dice is rolled.

(a) Even and doubles.
p=

(b) Even or doubles.
p=
Penny Nom lui répond.

A side of a square 2018-04-06

Angie pose la question :
I am dyslexic and have problems with spelling and math I'm trying to figure 4.610 Acres Square trying to figure out how many feet or yards of one side if that makes sense to you thank you I'd really appreciate the help
Penny Nom lui répond.

Factoring a quadratic 2018-04-02

Billy pose la question :
I need help factoring the following question: 4x(squared) -10x +16.
Penny Nom lui répond.

The price of a sheet of metal 2018-04-02

Nydia pose la question :
What is the formula to calculate the following:

I nee to find out what the sheet price be. The dimensions are 2000x3000 mm into ft they are 78x1181. The sqft price I have is $22.16. How do I figure out the sheet price from that?
Penny Nom lui répond.

A circle problem 2018-03-30

ahamed pose la question :
the diameters of a circle AB and CD intersect each other at O perpendicularly. Then a chord DF is drawn. AB and DF intersect at E. DE=6cn and EF=2cm.find the area of thw circle
Penny Nom lui répond.

The volume of a tent with a hexagonal base 2018-03-27

shohel pose la question :
A tent has its base in the shape of a regular hexagon whose sides are 10m . If the height of the tent is 12m , then find its volume.
Penny Nom lui répond.

Base 6 to base 4 2018-03-25

Malik pose la question :
Hi Sir..!
I just want to know the proper example with a brief explanation of conversion of base 6 into base 4. kindly reply me as soon as possible.. Thank you
Penny Nom lui répond.

The mean and median 2018-03-24

Myrte pose la question :
Is the median always smaller then the mean?
Penny Nom lui répond.

Distance between a chord and its arc on a circle 2018-03-23

Doug pose la question :
Specifically, what is the subject distance for the Earth orbiting for 27 days. Assume the orbit of the Earth to be a circle have a 93 million mile radius. Assume the angle of arc to be (27/365) x 360 degrees. Thank you.
Penny Nom lui répond.

A circle and two chords 2018-03-21

Ella pose la question :
In a circle, a 30 unit chord is 5 units closer to the center than a 20 unit chord. Find the radius.
Penny Nom lui répond.

Interest for 3 years 2018-03-21

Mary pose la question :
How much interest do you pay if the charges 0.12% over 3 years loan $4999
Penny Nom lui répond.

Walking a fraction of a mile 2018-03-20

Jamie pose la question :
Who walked a fraction of a mile that is closer to neither 0 nor 1 ? Explain
Avery 1/6
me.Nunez 5/6
Ms. Chang 1/3
Mr. O’Leary 4/8
Miss Lee 4/6
penny Nom lui répond.

Two regular pentagons 2018-03-19

Kip pose la question :
The ratio of the corresponding apothems of two similar regular pentagons is 5:7 What is the ratio of their areas?
Penny Nom lui répond.

A circle of circumference 4*pi*r 2018-03-19

Ankith pose la question :
If the circumference of a circle is 4*pi*r, what is its area?
i) 4*pi*r^2
ii) 2*pi*r^2
iii)3*pi*r^2
iv) pi*r^2
Penny Nom lui répond.

A penny is thrown from the top of a building 2018-03-16

Zoraida pose la question :
A penny is thrown from the top of a 26.7-meter building and hits the ground 3.39 seconds after it was thrown. The penny reached its maximum height above the ground 0.89 seconds after it was thrown.

a. Define a quadratic function, h, that expresses the height of the penny above the ground (measured in meters) as a function of the number of seconds elapsed since the penny was thrown, t. b. What is the maximum height of the penny above the ground?
Penny Nom lui répond.

1/4 acre of land 2018-03-15

Jean pose la question :
I have 1/4 acre of land.it is square.what should the measurement be for each side be in feet
Penny Nom lui répond.

Solve when the variable is in the exponent 2018-03-15

Dan pose la question :
50 x 2^n = 1,000,000
2^n = 20,000

what does n equal?
Penny Nom lui répond.

The volume of a cube 2018-03-15

Eli pose la question :
An outdoor art display is a metal cube with edge length 39 feet. What is the volume of the cube in cubic feet? In cubic yards
Penny Nom lui répond.

An equilateral triangle inscribed in a circle 2018-03-15

Olatundun pose la question :
An Equilateral Triangle Of Side 20cm Is Inscribed In A Circle.Calculate The Distance Of A Side Of The Triangle From the Centre Of The Circle.
Penny Nom lui répond.

A rope fom a dock to a boat 2018-03-14

Tracey pose la question :
A boat is tied with a rope to a dock that is 16 feet tall. Along, the water, the water the boat is 17 feet from the dock. How long is the rope connecting the boat to the dock? Let c represent the length of the rope.?
Penny Nom lui répond.

Which movie lasts longer? 2018-03-14

YKJAJA pose la question :
Which movie lasts longer than the other?
A) “space adventure” lasts for 1 2/3 hour
B) “animal world” lasts for 15/12 hour
Penny Nom lui répond.

A geometric series 2018-03-13

nathi pose la question :
Hi I am really struggling with this question please help !!!!
a pohutukawa tree is 86 centimetres when it is planted. in the first year after it is planted , the tree grows 42 centimetres in height.Each year the tree grows in height by 95% of the growth of the previous year.
assume that the growth in height of the pohutukawa tree can be modelled by a geometric sequence.
A)find the height of the tree 5 years after it is planted and figure out the maximum height the pohutukawa tree is expected to reach in centimetres. The maximum height part is not answered.
Penny Nom lui répond.

Solve sinX=0.703X for X 2018-03-13

PARAM pose la question :
sinX=0.703X
Penny Nom lui répond.

The sum and difference of two numbers 2018-03-13

samima pose la question :
Two numbers have a difference of 0.85 and the sum 1.What are the numbers?
Penny Nom lui répond.

0.366 x cos square (02 degree 17 mins 27 seconds) 2018-03-12

michael pose la question :
what is 0.366 x cos square (02 degree 17 mins 27 seconds)
what is 0.366 x cos square (88 degree 26 mins 45 seconds)
Penny Nom lui répond.

Graphing y = 2x - 1 2018-03-12

Himanshu pose la question :
Hi I Himanshu I having 1 doubt on 1 question this question of graph how to draw y=2x-1
Penny Nom lui répond.

The intersection of a curve and a line 2018-03-08

lola pose la question :
find the set of values of constant C for which the line y=x+c intersects the curve y=2 square root x at, at two distinct points
Penny Nom lui répond.

The dimensions of a rectangle 2018-03-03

Mia pose la question :
A wire of length 36cm is bent to form a rectangle. Find the dimensions of the rectangle.
Penny Nom lui répond.

Some 5 number sets 2018-03-02

Sarah pose la question :
Hello! My question is:
If I have 5 columns of numbers, and I want to create all possible combinations (or is it permutations?) How can I do that? For example all numbers in each column may not appear in any other column. so:
column 1: 1,2,3,4,5
column 2: 6,7,8,9,10
column 3: 11,12,13,14,15
column 4: 16,17,18,19,20
column 5: 21,22,23,24,25

how may I determine all the possible ways I can get sets of 5 out if this? Thanks!
Penny Nom lui répond.

Expand (5x-9)(5x+9) 2018-03-01

adil pose la question :
expand the following:
(5x-9)(5x+9)
Penny Nom lui répond.

Aspect ratio 2018-03-01

brad pose la question :
can you help me find the width if I know the length and aspect ratio of a object?
length = 78
aspect ratio = 1.42
width=?

length = 107
aspect radio= 2.02
width= ?

thank you
Penny Nom lui répond.

An item on sale costs 55% of the original price. 2018-02-28

Debra pose la question :
An item on sale costs 55% of the original price. The original price was $51 .
Penny Nom lui répond.

Parents, grandparents, great grandparents, ... 2018-02-28

jessica pose la question :
every person has 2 birth parents, 4 birth grandparents, and so on. These people are known as ancestors. How many ancestors does a person have in each generation? write in exponential form. 3ed generation, great-grandparents? 4th generation? 10th generation?
Penny Nom lui répond.

Is a rectangle a parallelogram? 2018-02-28

ellie pose la question :
is a rectangle a parallelogram?
Penny Nom lui répond.

The limit of (e^x-1)^(1/x) as x tends to 0 2018-02-27

ARGHA pose la question :
Find the limit of (e^x-1)^(1/x) as x tends to 0.
Penny Nom lui répond.

A cyclist reduces his speed 2018-02-27

Katherine pose la question :
Suppose the winner had reduced his average cycling rate by .1 mile per hour. By how much would his time have changed?

(the cyclist's rate is 23.66 miles per hour and the answer to the question before this one was that he cycled 2,292 miles in 96.87 hours)
Penny Nom lui répond.

A four digit pass code 2018-02-26

Jessica pose la question :
I was trying to fond out how many combinations could there be for a four digit pass code to a phone when no numbers are repeated?
Penny Nom lui répond.

Billions and trillions 2018-02-25

Sheila pose la question :
How many 50 billion equal 100 Trillion ?
How many 20 billion equal 100 Trillion?
How many 500 million equal 100 Trillion?
How many 50 million equal 100 Trillion?
How many 50 thousand equal 100 Trillion?
Penny Nom lui répond.

$525 is shared among three friends 2018-02-25

Iyanla pose la question :
If $525 is shared among three friends: Paul Katherine and Brandon so that Paul gets $15 less than Brandon and Katherine gets 4 times as much as Paul, how would I solve this equation?
Penny Nom lui répond.

The perimeter of a square 2018-02-25

Alicia pose la question :
What's the perimeter of a square with 441cm square
Penny Nom lui répond.

Multiplies and factors 2018-02-24

Lil pose la question :
Is a multiple the same as a factor?
Penny Nom lui répond.

Dividing a region in half 2018-02-24

mandy pose la question :
There is a line through the origin that divides the region bounded by the parabola y=4x−5x2y=4x−5x2 and the x-axis into two regions with equal area. What is the slope of that line?
Penny Nom lui répond.

The slope of a line 2018-02-22

Steve pose la question :
my current slope is 6%. I want to know how many inches higher I will be at 18' Thanks
Penny Nom lui répond.

2.5 gallons of liquid, one half an inch deep 2018-02-21

Cain pose la question :
How many square feet would 2.5 gallons of liquid cover at half an inch deep?
Penny Nom lui répond.

nC0 + nC1 + nC2 + .... + nCn = 2^n 2018-02-19

bristal pose la question :
(QQ) Prove, nC0 + nC1 + nC2 + .... + nCn = 2^n.
Penny Nom lui répond.

-2 (a + 4) = 18 2018-02-18

rebecca pose la question :
-2 (a + 4) = 18
how do i do this with showing it distributive property ( symbolically)
Thank you!
Penny Nom lui répond.

A footballer angle 2018-02-14

Kim pose la question :
Two goal posts are 8m apart. A footballer is 34m from one post and 38m from the other. Within what angle must he kick the ball if he is to score a goal.
Penny Nom lui répond.

What is the speed of the skateboarder? 2018-02-13

Zack pose la question :
It takes a skateboarder 20 minutes to get to school, which is 6 km from home. What is the speed of the skateboarder?
Penny Nom lui répond.

Solar cells 2018-02-12

karla pose la question :
Solar (photovoltaic) cells convert sunlight directly into electricity. If solar cells were 100% efficient, they would generate about 1000 watts of power per square meter of surface area when exposed to direct sunlight. With lower efficiency, they generate proportionally less power. For example, 10% efficient cells generate 100 watts of power in direct sunlight. Suppose you want to supply 22 kilowattss of power to a house by putting solar panels on its roof. For solar cells with the average power of 49 watts per square meter of solar panels, how many square meters of solar panels would you need? Assume you can make use of the average power from the solar cells
Penny Nom lui répond.

Related rates 2018-02-11

angelo pose la question :
hi admin please help me answer this question. thank you! At a certain instant of time, the angle A of a triangle ABC is 60 degrees and increasing at the rate of 5degrees per second, the side AB is 10cm and increasing at the rate of 1cm per second, and side AC is 16cm and decreasing at the rate of 1/2 cm per second. Find the rate of change of side AB?
Penny Nom lui répond.

Water in a cone 2018-02-10

Shuvo pose la question :
The diagram shows a vertical cross-section of a container in the form of an inverted cone of height 60 cm and base radius 20 cm. The circular base is held horizontal and uppermost. Water is pursed into the container at a constant rate of 40 cm3/s.
Show that, when the depth of water in the container is x cm, the volume of the water in the container is (πx^3)/27 cm3.
Find the rate of increase of "x" at the instant when "x" = 2.
Penny Nom lui répond.

3 yards 6 inches times 7 2018-02-08

Tamara pose la question :
3 yards 6 inches × 7
Penny Nom lui répond.

A parallelogram, a rhombus and a rectangle 2018-02-07

Sambo pose la question :
what do parallelogram, rhombus and rectangle have in common?
Penny Nom lui répond.

The wholesale price given the retail price and the markup 2018-02-07

Matthew pose la question :
Retail $99
Mark-up is 80%

What is the equation to find the original (wholesale) price (55)?

thanks
Penny Nom lui répond.

Adding two negatives 2018-02-04

Pinasshakoane pose la question :
(-23)+(-3)
Penny Nom lui répond.

A question about perfect squares 2018-02-04

Jolyn pose la question :
Find the smallest possible value of a whole number m if 648x m is a perfect square
Penny Nom lui répond.

The code on a new phone 2018-02-02

Maria pose la question :
Hi -
My husband gave me a new Samsung Galaxy mobile for out anniversaire gift. He set me a challenge which I have to solve before I can use the Phone. He has set the pin code with numbers 4, 7 and 0 and created a four digit code with the said numbers. Is there a way I can somehow list all possible combinations and try them all? Thanks!
Penny Nom lui répond.

Similar rectangles 2018-01-31

Kathy pose la question :
A rectangular picture frame is 14 inches long and 4 inches wide. Which dimensions could a similar picture frame have.
8 L X 21 W
35 L X 15 W
49 L X 14 W
7 L X 3 W
Penny Nom lui répond.

Positive and negative values of a function 2018-01-30

Grayson pose la question :
f(x)=x^6-x^4
Interval: ( negative infinity, negative one )
Test Value: negative two
Function Value f(x): positive forty eight
Interval: ( negative one, zero )
Test Value: negative one
Function Value f(x): zero
Interval: ( zero, positive one )
Test Value: positive one
Function Value f(x): zero
Interval: ( positive one, positive infinity )
Test Value: positive two
Function Value f(x): positive forty eight

What is the sign of f(x) for each Interval?
Penny Nom lui répond.

Pricing a piece of plate steel 2018-01-29

Simo pose la question :
I have a piece of plate that is 2500mm x 8000mm x 20mm thick and costs $7693.00

what is the formula to work out what 1000mm x 1000mm is worth?
Penny Nom lui répond.

Simplify 1/2^i 2018-01-28

Deepak pose la question :
How do I simplify this complex equation:

z=1/(2^i)
Penny Nom lui répond.

The sum and difference of two numbers 2018-01-25

Ali pose la question :
Hello,
I was looking at the original question that was posted and answered by
your team:
http://mathcentral.uregina.ca/QQ/database/QQ.09.07/s/donna1.html

I used the 7 and 4 as example and not looking for 39 per original
question:

A=7
B=4

7+ 4 =11 and 7-4 = 3

We end up with 11 +3 = 14

A= 14/2 give use 7

B = how do you solve for B or 4 with out knowing anything about 3 or any other numbers ?

Thank you
Ali

Penny Nom lui répond.

The equation of a line 2018-01-23

Gloria pose la question :
Write the equation of a line in standard form through the point (1, 6) and perpendicular to the line 2x –y = 9.
Penny Nom lui répond.

y as an expression in terms of x 2018-01-20

Mark pose la question :
What is y as an expression in terms of x ?
pennt lui répond.

Profit margin and markup 2018-01-18

Oyewumi pose la question :
Mr A sold a car to Mr B at 20% profit margin and Mr B sold the car to Mr C at 30% markup on cost. If Mr C got the car at $x.
1. How much did Mr A buy the car in terms of x.
2. How much did Mr A buy the car if x is $2800000
Penny Nom lui répond.

The product of the coordinates of a point on a line 2018-01-17

Sophia pose la question :
For any point on line l, the product of the x-coordinate and the y-coordinate is less than or equal to zero , what is the answer?
Penny Nom lui répond.

The decimal form of a fraction 2018-01-12

Tom pose la question :
Prove that the decimal representation of the quotient of 2 integers must repeat (if it does not terminate).
Penny Nom lui répond.

When are the hands of a clock perpendicular? 2018-01-11

Nazrul pose la question :
How many times in a day are the hands of a clock perpendicular to each other? How can I find the times? Please help me.
Penny Nom lui répond.

xy+x=2y. Solve for y 2018-01-10

Hugh pose la question :
xy+x=2y. Solve for y
Penny Nom lui répond.

A fraction of a mile 2018-01-06

Sierra pose la question :
There are 5280 feet in a mile. what fraction of a mile is represented by 660 feet?
Penny Nom lui répond.

2-color combinations 2018-01-05

Sabrina pose la question :
How many 2-color (pair) combinations can be made from 12 individual colors... is it (11x12) or (optional): (11x12)x2?
Penny Nom lui répond.

Compatible numbers 2018-01-02

Natalie pose la question :
I'm in 4th grade and two weeks ago my class learned how to use compatible numbers. I was REALLY confused but I didn't want to say I didn't understand because I just wanted to go home. Tomorrow we have the Topic 7 Test and I'm stuck on a problem that requires using compatible numbers. My mom apparently hasn't heard of compatible numbers and she can't really help me too much. Here's the problem : The local library places new books in a section with 31 shelves. Each shelf fits 18 books. Use compatible numbers to estimate the number of books that the library can fit on the shelves.
Penny Nom lui répond.

Speed in kilometers per hour 2017-12-21

Cody pose la question :
if a train travels 400 meters in 30 seconds how many kilometers per hr is it traveling
Penny Nom lui répond.

A puzzling sequence 2017-12-19

Alan pose la question :
My son has the following sequence to work out the formula for the nth term (and fing 5th and 6th terms) and I have tried a variety of ways but can't help!

1/2, 5/6, 1, 11/10

I have converted all to 15/30, 25/30, 30/30, 33/30 and so think the next two terms are 37/30 and 45/30 but I have no idea how to prove or if I am right!

Any help appreciated.
Penny Nom lui répond.

Retiring athletes numbers 2017-12-18

Robin pose la question :
I am wondering if you can explain in layman terms how to figure out how many different ways the numbers 00-99 can be arranged? The discussion that sparked this question revolved around the practice of retiring athletes numbers and how many actual number combinations there are. So if I were to use 00, 01, 02 03, 04, 05, 06, 07, 08, 09, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ....99. I say there are only 109 different numbers. I'm being told I'm wrong that there are way more than that. Please help. Thank you, Robin
Penny Nom lui répond.

Matched pairs 2017-12-13

Lin pose la question :
PLEASE HELP WITH THIS VERY DIFFICULT STATISTICS QUESTION(the process would really help)
Imagine you and your 4 study group partners are interested in whether all
those hours you spent together working on statistics problems for midterm
exam 2 actually helped your group's performance on that exam relative to its
performance on the first midterm exam. Suppose the first and second midterm
grades were as follows:
Is there sufficient evidence (at a = :05) to conclude that the group performed
better on midterm 2? Please provide all your calculations.

midterm 1 midterm 2

A 25 28

B 20 19

C 15 21

D 16 25

E 20 22

Penny Nom lui répond.

4444^4444 2017-12-10

Sashi pose la question :
4444 to power of 4444=?
Please share the result with simplification.
Penny Nom lui répond.

Needing the area of an irregular Pentagon 2017-12-06

Dale pose la question :
I'm needing to find the square footage of an irregular pentagon.
I've seen the other questions similar to this one, but without a great deal of difficulty can't get you the angle degrees, or the length between opposing angles.
I'm hoping that a different bit of information can help. So here goes:
The longest side is 67ft long.
One of its legs is 39ft long, and the other is 18ft long.
The leg off of the other end of the 39ft leg is 35ft long.
The leg off of the other end of the 18ft is 49ft long, and meets the other end of the 35ft side.
The information that I DO have, which I'm hoping makes the difference, is that the 39ft and the 18ft sides are parallel.
Also, while the angles at each end of the 67ft side are not right angles, they are fairly close to it, approximately 80 degrees at the 39 ft side corner, and 100 degrees at the 18ft side corner.

Dale.
Harley Weston lui répond.

A range hood 2017-12-04

Chuck pose la question :
I'm building a custom range hood and can't seem to get the angles correct where the front and side panels intersect.
I saw a similar post but there's no way I can do the calculations for a Wolfram Alpha!

Here are the dimensions that I have (in inches)...

Base - Front 29 7/16" x side 19 3/16"
Top - Front 10" x side 9"
Front Panel Length (from base to top on an angle) 21"
Side Panel Length (from base to top on an angle) - 17 9/16" Vertical distance from the base to the top 14 1/4 inches.

Any help finding the bevel/miter of the two front corners where the sides meet the front panel would be greatly appreciated.

I will need the angle for the saw in degrees.

Thank you in advance!

Regards, Chuck
Harley Weston lui répond.

An arithmetic sequence 2017-11-30

yo pose la question :
x; 2x+1; 11 are three consecutive terms of an arithmetic sequence.calculate x
Penny Nom lui répond.

The derivative of f(x)=2^x/x 2017-11-28

Chhavi pose la question :
f(x)=2^x/x.
Find f'(x).
Penny Nom lui répond.

GCD 2017-11-25

A student pose la question :
Suppose a,b, c are integers such that gcd(a,b)=gcd(a,c)=1. Show that gcd(a,bc)=1.
Penny Nom lui répond.

Abstract algebra 2017-11-25

A student pose la question :
Suppose a,b, c are integers such that gcd(a,b)=gcd(a,c)=1. Show that gcd(a,bc)=1.
Penny Nom lui répond.

Exponential form 2017-11-25

Sherry pose la question :
What is the exponential form of 3sqrt 15?
Penny Nom lui répond.

10 digit permutations 2017-11-24

Ed pose la question :
HI my question..
numbers1,2,3,4,5,6,7,8,9,0 how many combinations are there

example: 518, 269, 3470
example2:815,972, 3460
example3: 185,047,2369
Penny Nom lui répond.

Heat equation 2017-11-23

Max pose la question :
What does du\dt=a(triangle)^2u mean. Can it be solved for t.
Penny Nom lui répond.

How many miles did he drive in one hour? 2017-11-21

Ava pose la question :
Graham drove 42 1/3 Miles in 1 1/3 hours. How many miles did he drive in one hour?
Penny Nom lui répond.

An expression for the area of a triangle 2017-11-19

hari pose la question :
why is area of a triangle drawn from centre of a circle i.e radii forming the sides is 1/2 *r^2 sin theta where r is radius
Penny Nom lui répond.

Jesse has dimes and nickels in his piggy bank. 2017-11-18

Dee pose la question :
Jesse has dimes and nickels in his piggy bank. The number of nickels is 3 times the number of dimes. If the total amount is $8.50, how many coins are there in total?
Penny Nom lui répond.

Blair is 12 years younger than Serena right now. 2017-11-18

Dee pose la question :
Blair is 12 years younger than Serena right now. Three years ago Serena’s age was five times Blair’s age. What are their ages?
Penny Nom lui répond.

The mass of a length of tree trunk 2017-11-13

SM pose la question :
What is the mass of a length of 1m of trunk a tree trunk of uniform cross section of area 0.5 sq.m is made of wood of relative density 0.8?
Penny Nom lui répond.

Splitting twice 2017-11-11

Terry pose la question :
4 people are splitting 1/3 of something. 1 is to receive twice as much as the other 3. what it the fractional interest for each?
Penny Nom lui répond.

The graph of graph y= -2x-1 2017-11-11

Natividad pose la question :
How do you graph y= -2x-1?
Penny Nom lui répond.

A triangle with sides measuring 6, 8 and 10 inches 2017-11-11

rukhsar pose la question :
A certain triangle has sides, which are, respectively, 6 inches, 8 inches, and 10 inches long. A rectangle equal in area to that of the triangle has a width of 3 inches. The Perimeter of the rectangle, expressed in inches, is
Penny Nom lui répond.

math 2017-11-11

rukhsar pose la question :
A certain triangle has sides, which are, respectively, 6 inches, 8 inches, and 10 inches long. A rectangle equal in area to that of the triangle has a width of 3 inches. The Perimeter of the rectangle, expressed in inches, is
Penny Nom lui répond.

Five coins 2017-11-10

Allan pose la question :
I have five coins..a penny,a nickle,a dime,a quarter and a loonie.....how many different amounts of money could i pay using ny combination of this coins
Penny Nom lui répond.

Mathematical ideas in everyday life 2017-11-08

Ricita pose la question :
Mathematical ideas to solve various problems of our everyday life ,environment related problems.
Penny Nom lui répond.

Scale factor 2017-11-03

Hannah pose la question :
I do not understand it...... What is the scale factor for 9 cenimeters = 1 meter
Penny Nom lui répond.

Formula when i know the GST total 2017-10-31

Duncan pose la question :
HI - I've added up the GST from a pile of receipts and would like to know what the total cost of goods would be without GST. I don't want to add up 100's of receipts again with the cost before GST but I do need this total cost. i.e.) I know I paid $400 GST, what would the formula be to find out the cost of what I purchased before taxes? Your help is much appreciated!
Penny Nom lui répond.

formula when i know the GST total 2017-10-31

Duncan pose la question :
HI - I've added up the GST from a pile of receipts and would like to know what the total cost of goods would be without GST. I don't want to add up 100's of receipts again with the cost before GST but I do need this total cost. i.e.) I know I paid $400 GST, what would the formula be to find out the cost of what I purchased before taxes? Your help is much appreciated!
Penny Nom lui répond.

Surface area of a hemisphere 2017-10-28

Shaina pose la question :
If the total surface area of a hemisphere be 36.22/7 cm then its radius will be 3 cm is it true or false
Penny Nom lui répond.

Adding fractions 2017-10-27

Sandy pose la question :
virinchi distributed 4/7 of cake to his friends 1/3 of it to his family members which part of cake is remaining?
Penny Nom lui répond.

f(x)=-x^2-6x find f(x-2) 2017-10-27

Kenneth pose la question :
f(x)=-x^2-6x find f(x-2)
Penny Nom lui répond.

Solve 2cos^2 x + sin x = 2 2017-10-25

Yamama pose la question :
hello ! I need help to solve this equation :

2cos^2 x + sin x = 2

Thank you very much
Regards

Penny Nom lui répond.

11% of a central angle 2017-10-22

Hope pose la question :
How do you turn a percentage in to a central angle eg. 11%
Penny Nom lui répond.

A tangent to a curve 2017-10-22

Jasem pose la question :
Suppose that
f(x)=(3x-3)^1/2.

(A) Find an equation for the tangent line to the graph of f(x) at x=2

(B) Find all values of xx where the tangent line is horizontal, and enter them as a comma-separated list (e.g., 2,-3,6). If there are none, enter none.

Values of x

Penny Nom lui répond.

Sampling distribution 2017-10-16

Esther pose la question :
I need 4digits combination of 235689 and without replacement. Thanks
Penny Nom lui répond.

Salary plus commission 2017-10-16

Natasha pose la question :
Veronika works at Future Shop and earns ₱10.50/h plus 6% commission on sales. Last week Veronika worked 40 hours. What was Veronika’s weekly gross salary if her total sales were ₱2050?
Penny Nom lui répond.

The distance between the origin and a moving point on a graph 2017-10-16

Paulina pose la question :
Find the rate of change of the distance between the origin and a moving point on the graph of y=x^2 +1 if dx/dt=2 centimeters per second
Penny Nom lui répond.

Three consecutive odd integers 2017-10-10

Johanna pose la question :
Three consecutive odd integers are such that the sum of the first and second is 31 less than 3 times the third
Penny Nom lui répond.

27000001 2017-10-09

Tulashiram pose la question :
If a× b =27000001, then what is the value of a & b ?
Penny Nom lui répond.

Five bales 2017-10-08

John pose la question :
two answers were given... I believe both to be incorrect.
five bales weighed two at a time: weightx2 given: 110,112,113,114,115,116,117,118,120, and 121. It stated all combinations ie: ab,ac,ad,ad,bc,bd,be, etc. to arrive at the above 10 combined weights. I come up with the following...

Bale A= 54lbs, Bale B=56, Bale C=58, Bale D=59. and Bale E=62 pounds.

A+B=110, A+C=112, A+D=, B+C=114, B+D=115 ,A+E=116 ,C+D=117, B+E=118 ,C+E=120, and D+E=121

Penny Nom lui répond.

An enclosure for some remote control boats 2017-10-03

Roberto pose la question :
I am trying to build a "ring" for our remote control boats, using irrigation pipe. I'd like to use full 20' long sticks for the long sides and use eight of what we call 45s, which are actually 135' fittings to make the six short sides. If I know the length of the two long sides, what would be the formula to find the exact lengths of the short sides?

Thank you.
Penny Nom lui répond.

The volume of a cone without calculus 2017-10-02

Akash pose la question :
How to find the volume of a cone without the knowledge of calculus?
Penny Nom lui répond.

The square root of 6 is irrational 2017-10-02

John pose la question :
http://mathcentral.uregina.ca/QQ/database/QQ.09.06/sylvia1.html
In the initial assumption of that proof, root 6 is assumed to be a/b where a and b have no common factors, but why does having a common factor make it irrational?
Penny Nom lui répond.

The importance of a comma 2017-09-30

carolyn pose la question :
the equation 2y + 53 = 165 represents the situation joel spent 165 dollars on a pair of jeans and two shirts at the same price what does y represent
price of a pair of jeans
price of a shirt
amount joel spent on the shirts
number of shirts joel bought
Penny Nom lui répond.

Macy and Camile's ages 2017-09-30

carolyn pose la question :
macy is 2 years older than Camille twice the sum of their ages is 52 which equation can be used to find camilles age x
Penny Nom lui répond.

How many pet dogs? 2017-09-26

Michelle pose la question :
In 2016 there were about 135 million households in the United States. 36.5% of the households own at least one dog. On average, these households have 1.6 dogs. How many millins of pet dogs were in the United States in 2016?
Penny Nom lui répond.

Four multiples of 10 2017-09-23

Laudacir pose la question :
Four multiples of 10 are added together.the total is a 3 digit number with three consecutive digits. What could the four number be?
Penny Nom lui répond.

Changing a mixed number to a decimal 2017-09-23

karla pose la question :
to change an improper fraction into a decimal 5 3/4 equals
Penny Nom lui répond.

Walking up and down a hill 2017-09-19

Justina pose la question :
At 2:20 p.m. Jack is at the top of the hill and starts walking down at the exact same time that Jill, who is at the bottom of the hill, starts walking up. If they maintain the uphill speed of 2mph and downhill speed of 4mph and the distance from the bottom to the top of the hill is 1.5 mi, at what time will Jack and Jill meet?
Penny Nom lui répond.

Up a hill and down again 2017-09-17

justina pose la question :
Jack and Jill travel up a hill at a speed of 2mi/h.they travel back down the hill at a speed of 4mi/h.what is their average speed for the entire trip? express your answer as a mixed number
Penny Nom lui répond.

An alphabetic sequence 2017-09-17

malik pose la question :
find the letter of the following series....?

ZOTTFFSSE-
Penny Nom lui répond.