.
. centre de ressources dilemmes et doutes le visage humain de mathématiques Qui sommes-nous Problème de mois activités de promotion babillard
Centrale des maths - centraledesmaths.uregina.ca
Dilemmes & doutes
« D & D »
. .
topic card  

Sujet:

si

liste de
sujets
. .
nouvelle recherche

1452 articles trouvés pour ce sujet.
 
Page
1/1
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.
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.
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.
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.
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.
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.
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.
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.
Illusion géométrique 2007-04-04
Dominique pose la question :
Je n'arrive pas expliquer la modofocation de surface.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Calculating the area (acreage) of a four sided lot 2007-07-18
A property owner pose la question :
I have a real estate property and the lot size is something I need to find out. I know the lengths of the four sides, but it isn't a rectangle, it is an odd shape. How do I find the acreage?
Stephen La Rocque lui répond.
Lot size / acreage (more than three sides) 2007-05-11
Martha pose la question :
What is the lot size of the following dimensions equivalent to acre. 141.85 x 52.55 x 217.63 x 38.89 x 68.08
Penny Nom and Stephen La Rocque lui répond.
Cutting a round cake so that it doesn't dry out 2014-08-26
James pose la question :
I'm wondering if there's a simple way to calculate the area between two parallel chords of a circle equidistant from its diameter, or if I have the area, to find the distance between the two chords.
Here's my "problem". You may have heard of the way of cutting a round cake so that it doesn't dry out - make two parallel cuts (chords) the length of the cake, take the middle piece, then push the two pieces together.
So I know the area of a 12" cake, and I want say, exactly an eighth of the cake. How wide do I cut the centre piece? Now to get even more difficult, the next day I want another eighth from the centre. How wide do I cut the next pieces, and so on...? Thanks, James

Harley Weston lui répond.
Revisiting 8 golfers in two foursomes 2014-08-19
steve pose la question :

I noticed you had an answer on how can you put 8 golfers in even foursomes over 7 games so that everyone plays with everyone equally. However the formula showed the following sequence that was used but did not go past the second day. Can you change the 0s and 1s into the numbers 1 to 8 instead. Here is what you have written:
Day 0 : (0, 0, 0, 0, 1, 1, 1, 1)
Day 1 : (0, 0, 1, 1, 0, 0, 1, 1)
Day 2 : (0, 1, 0, 1, 0, 1, 0, 1)
Day 3 : (0, 1, 1, 0, 1, 0, 0, 1)
Day 4 : (0, 0, 1, 1, 1, 1, 0, 0)
Day 5 : (0, 1, 0, 1, 1, 0, 1, 0)
Day 6 : (0, 1, 1, 0, 0, 1, 1, 0)

Thank you so much for your anticipated help.

Steve


Harley Weston lui répond.
A barge of triangular cross section 2014-08-18
tushar pose la question :
a barge of triangular cross section is 20m long 12 m wide and 6m deep.its floats in SW at a draft if 4m find its displacement
Penny Nom lui répond.
How do you convert square mm to square cm? 2014-08-13
David pose la question :
How do you convert square mm to square cm?
Tyler Wood lui répond.
4821x14y is an 8-digit number divisible by 72 2014-08-06
RAYA pose la question :
if 4821x14y is an 8-digit number divisible by 72. How many values can x and y take?
Penny Nom lui répond.
The dimensions of a rectangle 2014-08-03
Jamaica pose la question :
if the perimeter of a rectangle is 30m and its area is 56 m2.find its length and width?
Penny Nom lui répond.
The sum of the first 50 terms of an arithmetic progression 2014-07-26
Joshua pose la question :
Hello ...my is Joshua...I'm a grade 11 student...I got a question

Calculate the sum of the first 50 terms of an arithmetic progression: 112:98:84

Penny Nom lui répond.
An octagon around a tree 2014-07-16
floyd pose la question :
I want to build an octagon 4 feet from base of tree from 4x4's. What length do I cut my pieces
Penny Nom lui répond.
Solve sin3x = cos2x 2014-07-14
Emanuel pose la question :
If sin3x=cos2x, find the value of x when x<0<90'
Penny Nom lui répond.
A 5 sided lot 2014-07-10
mia pose la question :
have the feet numbers of three sides, but the forth side is in a "V" so it has two figures. Question: can i add the two figures of the "v" together to get one figure, so then I would have the figures for all four sides.
Harley Weston lui répond.
67 cubic yards in cubic metres 2014-07-09
gavin pose la question :
Convert 67 cu yards into cu metres
Penny Nom lui répond.
The method of elimination 2014-07-05
leo pose la question :
please explain how can i solve this problem

3x-6y=-38
6x-9y=44

using elimination and simultaneous method thank you :)

Penny Nom lui répond.
A six digit number 2014-06-30
anupam pose la question :
hi,
my daughter asking a solution for the below question, kindly help.

Write the smallest 6 digit number wit digits ( 2,4,3,0,5,7).

plz this is an urgent requirement.

regards,
anupam

Penny Nom lui répond.
Simultaneous equations 2014-06-20
rana pose la question :
solve the simultaneous equations
a)3x=7y
12y=5x-1

Penny Nom lui répond.
Two regression lines 2014-06-14
catherine pose la question :
Given a set of data values ,we can get two regression lines .Explain.
Robert Dawson and Penny Nom lui répond.
A small solid silver pyramid 2014-06-13
Jenesis pose la question :
For Awards Night at Baddeck High School, the math club is designing small solid silver pyramids.The base of the pyramids will be a 2 in by 2 in square. The pyramids should not weigh more than 2.5 pounds. One cubic foot of silver weighs 655 pounds. What is the maximum height of the pyramids?
Penny Nom lui répond.
The weight of salt in a basket 2014-05-17
Sumit pose la question :
I want to determine how many kg of salt or XYZ thing can be filled in a basket
Length = 4.5"
Breadth = 5"
Height = 6"

Even its formulae

is kg quantity can be different for semi solid thing

Penny Nom lui répond.
The length of a shadow 2014-05-09
vijay pose la question :
A girl of height 80 cm is running away from the base of a lamp-post at a speed of 2 m/s. If the lamp is 4 m above the ground, find the length of her shadow after 5 seconds.
Penny Nom lui répond.
A cone of vision 2014-04-29
David pose la question :
It is known that a fish in water looking up has a 97 degree "cone" of vision that sees "through" the surface of the water. If a fish lies 4 inches below the surface, the cone forms a window (circle) smaller than if a fish lies 8 inches below the surface. What is the ratio of inches of depth to the radius of the circle on the surface that is its visual window?
Penny Nom lui répond.
A triangular chicken pen 2014-04-27
Cierra pose la question :
Margaret has two lengths of fence, 20 meters and 24 meters, for two sides of a triangular chicken pen. The third side will be on the north side of the barn. One fence length makes a 75° angle with the barn. How many different pens can she build if one fence is attached at the corner of the barn? What are all the possible lengths for the barn side of the pen?

Not sure what they are asking here... please show step by step what to do! Thank you so much!

Penny Nom lui répond.
The derivative of sin(x) 2014-04-26
Lucky pose la question :
f(x)=Sin(x), by first principle its f'(x)...show me how to solve such problem.
Penny Nom lui répond.
Simultaneous equations with fractions 2014-04-19
Maryam pose la question :
I looked at your example of simultaneous equations with fractions and applied it to my question from an educate exam papers but I couldn't get it to work. The question is:

x/8 - y = -5/2
3x + y/3 = 13

Penny Nom lui répond.
A slab of wet clay 2014-04-12
Karen pose la question :
How many square feet ( at 1/4 inch thickness) are in 100 lbs. of wet clay?
Penny Nom lui répond.
Two cones 2014-04-09
c.j pose la question :
what is the length of the radius of the LARGER cone(the LARGER cone has a slant height of 15) when the SMALLER cone has a radius of 8 and a slant height of 12ft ,please help.
Penny Nom lui répond.
The sides of a triangle 2014-04-06
Michael pose la question :
I am supposed to sove for the length of side "b" of an irregular triangle. I am given the following:
Side a: 65'
Side b: Find this length
Side c: 50'
Angle A: unknown
Angle B: unknown
Angle C: 52 degrees
I am supposed to use the law of cosines to solve for side "b" and my teacher says there is no mistake in the "givens" for the problem. I do not see how this can be done using the law of cosines and i have not figured out how to sove for angle B to use the law of cosines.

Penny Nom lui répond.
A 4 digit number 2014-04-04
LIM pose la question :
"A" is a 4 digit number formed by all the numbers from 1 to 4. When "A" is divided by 9, the remainder is the biggest possible value. What is the biggest value of A?
Chris Fisher lui répond.
Shadows of a father and son 2014-04-02
esada pose la question :
the father and son cast a shadow of 11 feet and 8 feet,respectively if the son is 4'8'' in height,how tall is the father?
Penny Nom lui répond.
Reducing the size of a poster by a scale factor of 1/3 2014-04-01
deeshon pose la question :
eric is making a smaller copy of a poster that measures 20.4 cm wide by 34.2 cm long.he reduces the original by a scale factor of 1/3.what are the dimensions of the copy
Penny Nom lui répond.
An arithmetic progression 2014-03-31
Japheth pose la question :
The 3rd term of an A.P is 10 more than the first term while the fifth term is 15 more than the second term. Find the first term?
Penny Nom lui répond.
A formula for determining concrete volume in cu. yd. 2014-03-19
Steven pose la question :
I know a couple of formulas for determining concrete volume in cu.yd. the one I use most frequently is length in feet x width in feet x thickness in inch. Divided by 324. It works every time. Where does the number 324 come from.
Penny Nom lui répond.
The area of a 5 sided lot 2014-03-15
Michael pose la question :
Question from michael:

This lot is in feet. 59x154x109x188x137 per the plot plan

Harley Weston lui répond.
A parabolic suspension bridge 2014-03-11
jeffrey pose la question :
the towers of a parabolic suspension bridges 200 meter long are 40 meter high and the lowest point of the cable is 10 meter above the roadway.Find the vertical distance from the roadway to the cable at 50 meter from the center.
Penny Nom lui répond.
Simple interest 2014-03-08
lynn pose la question :
I need to find what the interest will be for: 5000.00 @ 16.5% annual rate, and the same for 10.8 % for 5000.00 annual rate all one question

thank you for your aid

Penny Nom lui répond.
The angle of depression 2014-03-08
Ranger_minor pose la question :
A woman of height 1.4 metres standing on the top of a building 34.6 metres high views a tree some distance away. she observes that the angle of depression of the bottom of the tree is 35 degrees and the angle of depression of the top of the tree is 29 degrees.

assume that the building and the tree are on level ground :
1). calculate the distance of the woman from the top of the tree measured along her line of sight.

Penny Nom lui répond.
Simultaneous fractional equations 2014-02-15
benjamin pose la question :
hi math central. benjamin here. during class, i had problem with this topic. normally i wont have problems with math but this topic i just too hard for me. please help i am having exam and test next week on this topic

here is the question:
using substitution method, solve the simultaneous equation.
(x+1)/(y+2)=0.5

(x-2)/(y-1)=1/3

Penny Nom lui répond.
Converting cost per cubic yard to cost per ton 2014-02-05
Mayra pose la question :
If 18 cubic yards= 25 tons and it's $28.00 per yard how much is it a ton. I need help please a refresher on my algebra. Thank you
Penny Nom lui répond.
Two nonlinear equations 2014-01-26
Naryn pose la question :
(1÷x) + (1÷y) = (7÷12)
xy = 12

Penny Nom lui répond.
When would one flip the inequality sign? 2014-01-09
Natasha pose la question :
Would one flip the inequality symbol in this equation: (explain why) (-9a)/(-9) > 81
And please explain in what circumstances one would flip the inequality sign
THANKS!

Penny Nom lui répond.
An arithmetic sequence 2014-01-06
paris pose la question :
find the twenty-fifth term of an arithmetic sequence whose first term is 12 and whose common difference is -6
Penny Nom lui répond.
25% profit 2014-01-02
Finn pose la question :
Hello,
The question is all about buy-and-sell business.
Problem:
Pencil - $6 for whole sale price
     $8 if I sell the item How do I get the 25% profit? (you can change the whole sale price and the retail price[if i sell the item])
if I buy the pencil at 24 pieces and sell it at 24 pieces.

Penny Nom lui répond.
0.35 as a fraction 2013-11-28
Laura pose la question :
How do you write 0.35 as a fraction or mixed number?
Laura

Penny Nom lui répond.
Substitution type simultaneous equations 2013-11-03
Kayla pose la question :
I am having problems with substitution type simultaneous equations, when the variable you are substituting is a algebraic one:
y=x^2-3x+4 and 3x-2y=1
I have rearranged 3x-2y=1 to get x=(1+2y)/3 but when I substitute this x value into the other equation, I get the wrong answers!
Would appreciate any help! Thank you.

Penny Nom lui répond.
Proportional rates 2013-10-10
Varsha pose la question :
A province's Ministry of Social services has found that both the number of people needing social assistance and the province's total expenditures on social assistance are proportional to the rate of unemployment. Last August when the provincial unemployment rate was 8.4 %, the province provided assistance to 89,300 individuals at a total cost of 4107.4 million. The forecast unemployment rate for next August is 7.9%. How many people can the province expect to need social assistance next August? What amount should the province budget for social assistance in August?
Penny Nom lui répond.
How many cubic centimetres are there is a cubic meter? 2013-10-10
Larry pose la question :
Change 1meter(to 3rd power) to centimetre(to 3rd power). This is a metric conversion problem
Penny Nom lui répond.
An Arithmetic Progression 2013-10-08
collins pose la question :
In an A.P. the difference between the 8th and 4th term is 20 and the 8th is one and half times the 4th term... what is the common difference and the first term
Penny Nom lui répond.
A triangle problem 2013-10-02
raneem pose la question :
ABC is a triangle in which : BC=20cm. M(<B) =29 and m(<C)=73 . D is the midpoint of BC Find the length Of AB and AD approximated to 2 decimal places
Penny Nom lui répond.
A schedule for 2, 7 team divisions 2013-09-24
Sampson pose la question :
I'm looking to set up a weekly schedule within a 22 week segment of 2 7 team divisions where every team plays every other team in their divison 3 times and have 4 cross over games with 4 of the other 7 teams in the other division. I've yet to figure this out. Thanks for your time.
Victoria West lui répond.
Miles per minute to miles per hour 2013-09-08
Adam pose la question :
Convert 250 miles per min to miles per hour
Penny Nom lui répond.
How we convert cm to mm? 2013-09-08
Génesis pose la question :
How we convert cm to mm?
Penny Nom lui répond.
The sum of all whole numbers from 1 to X 2013-09-06
Tim pose la question :
How do I develop a rule for the sum of all whole numbers from 1 to X when I have no idea how to do this
Penny Nom lui répond.
A sequence or a series? 2013-09-05
Rahul pose la question :
Whether the following sequence is increasing or decreasing? I even do not kow whether to call it a sequence or not. an = (1/(1+n))+(1/(2+n))+....+(1/(n+n)). I am confused. It looks like a series to me. Please help.
Regards,
Rahul

Robert Dawson lui répond.
Tesseract 2013-08-22
Dan pose la question :
I am not a mathematician. This seems to me an intuitively simple enough problem that I very much need an answer to from someone who's mathematics are better than mine. Please help.

The question is: for a tesseract of side length = 1 what is the distance of the center of each cube from the center of the tesseract ?

I think I have calculated the distance of each vertex from the center, and of the center of each edge from the center, but the question above baffles me.

(anyone not having a clue what I am talking about can brush up here http://en.wikipedia.org/wiki/Tesseract )

Thanks in advance - Dan V

Robert Dawson lui répond.
Similar rectangles 2013-08-17
Mattie pose la question :
The dimensions of a rectangular-shaped picture frame are 14 inches long and four inches wide. Which dimensions below represent another frame that i geometrically similar>

a. l=49 in. and w=14in.
b. l=7in and w=3in
c. l=21in and w=8in
d. l=24in and w=14in

thanks

Penny Nom lui répond.
Using trig to find the height of a hill 2013-08-14
Anna pose la question :
From the top of a hill, the angles of depression of two successive milestones on a level road, which leads straight away from the hill, are 5degrees and 15degrees respectively. Fine the height of the hill.
Suggestion: BE is drawn perpendicular to AD. Find BE, then BD, finally CD.

Thanks :)

Penny Nom lui répond.
A triangle construction 2013-07-27
Nazrul pose la question :
Two angles and the difference of the lengths of their opposite sides of a triangle are given. How can I draw the triangle. Please help me.
Chris Fisher lui répond.
What is the smallest number? (i.e. the closest number to zero) 2013-07-22
Charlie pose la question :
What is the smallest number? (i.e. the closest number to zero)
Harley Weston lui répond.
Simultaneous equations 2013-07-10
Warren pose la question :
solve this simultaneous equation:
xy=4
2x+3y=14

Penny Nom lui répond.
An arithmetic progression 2013-07-06
ashok pose la question :
the 4th and 10th term a.p respectively 7 and 19 find its 15th term.....
Penny Nom lui répond.
A 3 acre plot 2013-06-17
Chad pose la question :
I have 3 acres 100ft at the top and bottom what is the length of each side to make up the 3 acres
Penny Nom lui répond.
{(1+x)^1/3-1/3X(1+x)^-2/3}/(1+x)^2/3 2013-06-17
STEPHEN pose la question :
{(1+x)^1/3-1/3X(1+x)^-2/3}/(1+x)^2/3
Penny Nom lui répond.
An isosceles tiangle 2013-06-16
Izzy pose la question :
what's the height of an isosceles triangle which has a base of 50 m, and both of the other sides are 25 m?
Penny Nom lui répond.
Simson line 2013-05-23
Nazrul pose la question :
From any point p lying on the circumcircle of the triangle perpendiculars PD , PE are drawn on BC,CA respectively. The line segment ED intersects at the point 0 ; prove that PO ⊥ AB ( PO is perpendicular to AB ).
Chris Fisher lui répond.
A 2-digit number 2013-05-13
A teacher pose la question :
Find a “2-digit number” where the sum of the 1st digit (on the Left) and the square of the 2nd digit equal the same number.
Lorraine Dame, Harley Weston lui répond.
siin (A) and sin (A/2) 2013-05-09
shanaia pose la question :
given that sin A=4/5 and A is obtuse.find sin (A/2)
Penny Nom lui répond.
A silver figurine 2013-05-03
Renee pose la question :
I have a silver figurine, the density of silver is 10.5g/cm3. if the figurine weighed 149 g. to determine the volume, he dropped it into a cylindrical glas of water. the diameter of the glass is 6 cm and the figurine was pure silver, by how much should the water level in the glass rise?
Penny Nom lui répond.
How can we draw the equation "x+y=1" in 3d? 2013-05-03
shimaa pose la question :
how can we draw the equation "x+y=1" in 3d
Robert Dawson lui répond.
How do i reverse this formula? 2013-04-20
MK pose la question :
I have 22,000,000 worth of gold and wants to want to resell the gold back with a profit. Each transaction of gold will have a transaction fee of 15%, so if i resell the gold back at 22,000,000, I will only get back 18,700,000 after 15% transaction cut. The current formula is X-15%X = Y where X = 22,000,000 and Y = 18,700,000 Will u be able to come up with a new formula if we don't know the value of X but we know the value of Y
Something like this X-15%X = 22,000,000. How do i reverse this formula to find the value of X
Thanks

Penny Nom lui répond.
4 linear equations with 3 unknowns 2013-04-12
Marian pose la question :
how to solve for 3 unknowns in 4 simultaneous equations
Penny Nom lui répond.
The distance between 2 lines in 4D 2013-04-01
samane pose la question :
how can i measure the distance between 2 lines in 4D??
Chris Fisher lui répond.
We can't write sinx and cosx as a finite polynomial. 2013-03-31
rimoshika pose la question :
prove that we can't write sinx and cosx as a finite polynomial.
Walter Whiteley lui répond.
Simultaneous equations with fractions 2013-03-31
Terence pose la question :
5/x-6/y=1 17/x+30/y=16 I been spending whole day to solve this question. Would be very grateful if you can help I try The denominator value is a equations term which make is simultaneous equations so hard.
Penny Nom lui répond.
The dimensions of a rectangle 2013-03-19
stephanie pose la question :
the length of a rectangle is 5m more than twice its width, and the area of the rectangle is 88m^2 find the demensions of the rectangle
Penny Nom lui répond.
Six-digit passwords 2013-03-19
Judy pose la question :
Hello:
Can you please explain why the answer to the following question is 10^6? What is the number of possible six-digit passwords when using the digits 0 through 9, with repetition allowed.
Thank you.

Penny Nom lui répond.
An algebraic exercise 2013-03-18
autumn pose la question :
given: f(x)=x/(x^2+2) determine: [f(x-h)-f(x)]/h
Penny Nom lui répond.
A messy arithmetic expression 2013-02-24
niiaryee pose la question :
(((((5^2*4^3)1/5+9^3/3)+(25+(4*5)/15)^2-10)/10/2)3)))))
Penny Nom lui répond.
Fractions over fractions 2013-02-22
Kenssa pose la question :
Question from Kenssa, a parent:

Simplify: 3-(7/x)-(6/x^2) / (3/x^2)+(5/x)-2

Harley Weston lui répond.
The continuity of f(x,y)=ln(x^2+y^2) 2013-02-17
anu pose la question :
the question says we have to find the points in the plane where the function is continuous: f(x,y)=ln(x^2+y^2) . here we aren't given a particular point (x,y) where we have to check a function's continuity. what is to be done if we have to check continuity over the whole domain of the function? please help .
Harley Weston lui répond.
A word problem involving toys 2013-02-14
sandy pose la question :
Each boy gets 5 toys.Each girl gets 3 toys.There are 150 pupils.
The boys had 74 more toys than girls.
How many boys?
How many girls?

Penny Nom lui répond.
Simultaneous equations 2013-02-10
Michael pose la question :
2P + 1/3V =8
3P - 2/V=5

Penny Nom lui répond.
An arithmetic progression 2013-02-06
loberto pose la question :
the 3rd term of an a.p is 10more than the 1st term,while the 5th term is 15more than the 2nd term,find the sum of the 8th and 15th terms of the a.p if the 7th term is 7times the 1st term
Penny Nom lui répond.
A relation on a collection of sets 2013-02-04
raji pose la question :
suppose R be a non empty relation on a collection of sets defined by ARB if and only if A intersection B is nullset.then.....the correct answer is R is symmetric and not transitive...my doubt is how it is symmetric
Penny Nom lui répond.
The fourth side of an irregular polygon 2013-02-01
Emran pose la question :
I have a irregular polygon. I know 3 of the 4 sides, and 2 of the angles. A-B is 285, B-C is 149, and C-D is 310. Angle B is 135 degrees. and Angle C is 45 degrees. Is there a formula to solve for the final side? Thanks.
Penny Nom lui répond.
The weight of a pipe full of water 2013-01-16
joe pose la question :
how do you figure out the weight of a pipe full of water
Harley Weston lui répond.
A balance puzzle 2013-01-14
Emily pose la question :
I'm stuck on this problem and feel that it can't work! The problem is: there is a door with a balance scale on it. In order to open the door, you have to use the 5 weights to balance the scale. On the left side you have 2 boxes to place the weights and on the right side you have 3. You're 5 weights are as follows: 1lbs, 2lbs, 3lbs, 4lbs, 5lbs. How do you place the weights so that the scale is balanced?
Penny Nom lui répond.
The side lengths of a triangle 2013-01-07
Katie pose la question :
How do I find the side lengths of a triangle knowing the base and its height?

Thank you,

Penny Nom lui répond.
A triangular island 2012-12-29
Udit pose la question :
A long time ago Mr Gibson found an island shaped as a triangle with three straight shores of length 3 km,4 km and 5 km. He declared an 'exclusion zone' around his island and forbade anyone to come within 1 km of his shore. What was the area of his exclusion zone?
Penny Nom lui répond.
A 12 acre parcel of land 2012-12-28
John pose la question :
What are the dimensions of a 12-acre parcel if it is 3 square acres deep and 4 square acres wide?
Penny Nom lui répond.
Two polynomials are divisible by x - 2 2012-12-26
Tehmas pose la question :
Determine the values of m and n so that the polynomials 2x^3+mx^2+nx-3 and x^3-3mx^2+2nx+4 are both divisible by x-2.
Penny Nom lui répond.
The last 4 digits of a cell phone number 2012-12-22
Jacob pose la question :
If the last 4 digits of a cell phone number, XXX-XXX-ABCD, are restricted where: A cannot be 0 or 1 and B cannot be 0 / how many possible 4 digit combinations are left?
Penny Nom lui répond.
A project on reclaiming water 2012-12-11
shannon pose la question :
I'm doing a report to reclaim water off of our campus facility to store in a cistern to use to flush toilets.

In Southeast Wisconsin and average of 82 inches of rain and snow fall annually. I want to collect that off of the roof of our school building. The roof is 37128 square feet. how many gallons annually could I collect?

Penny Nom lui répond.
The angles of elevation and depression 2012-12-03
Chelsey pose la question :
a person on a balcony of one building looks towards a second building. if the angle of elevation to the top of the second building is 25 degrees, the angle of depression to the bottom of the second building is 17 degrees, and the balcony of the first building is 22 feet above the ground, what is the height of the second building?
Penny Nom lui répond.
Transposition error 2012-12-03
Carol pose la question :
What is the correct term for when a child writes 61 instead of 16, or 83 for 38--when they switch the place values of a number?
Chris Fisher lui répond.
A function problem 2012-11-18
nahla pose la question :
f: IN --> IN
n --> f(n)
for every n that belongs the IN : fof(x) = 4n - 3
and for every n that belongs to IN f(2^n) = 2^(n+1) -1

Calculate f(993)

Penny Nom lui répond.
The square of any odd number, decreased by 1, is divisible by 8 2012-11-16
bailey pose la question :
Prove that the square of any odd number, decreased by 1, is divisible by 8
Penny Nom lui répond.
A mathematical expression with the answer 7 2012-11-10
emily pose la question :
hey um i need to find and problem that fallows bedmas that has one division one multiplication and one sub and one add and one brackets and one exponents that has the answer of number 7
Penny Nom lui répond.
Forming an algebraic expression 2012-10-27
ashley pose la question :
A sidewalk has a constant width W and comprises several short sections having lengths 12, 14,and 10 feet. How do I find the simplified expression that gives the number of square feet of sidewalk?
Penny Nom lui répond.
Some 6 digit numbers 2012-10-23
Mason pose la question :
How many different 6 digit numbers can you make using the digits 1 ,2 5, 6, 7, and 9? How many of these six-digit numbers are divisible by 6?
Penny Nom lui répond.
A 2 acre plot 2012-10-22
bob pose la question :
If a plot of land on the south side is 290.16 feet wide, how many feet on the west and east side to the north to make a 2 acre plot?
Thank You Bob

Penny Nom lui répond.
Converting a fraction to a decimal 2012-10-20
A Teacher pose la question :
My students want an easy way to convert a fraction to a decimal, can I get one from you?
Penny Nom lui répond.
A proof by contraposition 2012-10-19
Rahul pose la question :
I am not able to understand the following,
To prove that if for all e>0, |x|0, then |x|>=e. I understand the approach very well but I do not understand why if |x|=e then |x|>=e. If it is so then why not |x|= Thanks in advance!'
Rahul.

Penny Nom lui répond.
Composition of functions and one to one 2012-10-17
Ariana pose la question :
If f o g are one to one function,does it follow that g is one to one? Give reasons for your answers
Penny Nom lui répond.
A word problem involving a fraction 2012-10-12
Derrick pose la question :
If the numerator and denominator of a fraction are both decreased by 1 the fraction becomes 2/3. If the numerator and denominator are both increased by 1 the fraction will be 3/4. Find the original fraction. How to do?
Penny Nom lui répond.
Find an algebraic expression 2012-10-03
Karen pose la question :

Question from Karen, a parent:

Find an algebraic expression relating the input and output.

input output
   
3 1
9 3
15 5
21 7
27 9

Penny Nom lui répond.
A problem involving simple interest 2012-09-27
Tash pose la question :
The amount of money in a single year of an investment after P dollars were initially invested is A = P + Prt, where r is the rate of simple interest. What expression describes P? How much money was initially invested if the account has $1000 one year after the initial investment and the interest rate was 5%?
Penny Nom lui répond.
Changing the sign of an inequality 2012-09-19
Bryauna pose la question :
Why do you change the signs in inequalities?!
Penny Nom lui répond.
The dimensions of a rectangle 2012-09-12
Becky pose la question :
A rectangle has an area of 48 square inches and perimeter of 32 inches. Find the dimensions of the rectangle.
Penny Nom lui répond.
Six digit numbers 2012-09-11
Fiona pose la question :
using the numerals 0, 2, 3, 5, 7, 9, make as many six-digit numbers as you can. Rearrange them into ascending order
Robert Dawson lui répond.
Minutes and seconds 2012-08-29
Casey pose la question :
I have to write a variable equation. The questions says there are 60 seconds. but we need to write and equation to solve for minutes. Is it 1/60 or 1/s
Robert Dawson lui répond.
Vector division 2012-08-28
Nazrul pose la question :
If A and B be two vectors where B = 3 A The What is B/A ?
Please help me.

Robert Dawson lui répond.
An arithmetic progression 2012-08-22
A student pose la question :
the 3rd term of an A.PPP is 10 more than the first term while the 5th term is 15 more than the second.find the sum of the 8th and 15th terms if the 7th term is 7 times the first term.
Penny Nom lui répond.
0.687 acres in square feet. 2012-07-18
Roy pose la question :
The land parcel I am looking at says Acreage .687 how do I determine square feet?
Robert Dawson lui répond.
A sand box with 14 sides 2012-07-10
Tom pose la question :
Want to build a sand box for a pool that is fourteen foot round wanted to make it in fourteen pieces of wood what angle would each piece be and how long would each piece be
Harley Weston lui répond.
Six people divided into three groups of two 2012-07-09
Fatima pose la question :
Six people call them A,B,C,D,E,F are randomly divided into three groups of two,find the probability of the below event(do not impose unwanted ordering among groups) E andF are in the same group I solved it but I have a doubt that it is wrong . My answer is 576 Please help to solve this problem.
Lorraine Dame and Penny Nom lui répond.
An octagonal sandbox around a pool 2012-06-12
Linda pose la question :
My pool is 15 feet across and it is round.

How do I measure to cut wood to build a sandbox around it? was thinking it will look like an octagon.

Thanks

Harley Weston lui répond.
The position of an aircraft relative to the airport 2012-06-08
Dennis pose la question :
"Air traffic controllers usually describe the position of an aircraft relative to the airport by altitude, horizontal distance, and bearing.  Suppose an aircraft is at altitude 500m, distance 15km, and bearing 35 degrees east of north.  What are the x,y, and z components (in meters) of the position vector. The x-axis is east, the y-axis is north and the z-axis is vertical.
Penny Nom lui répond.
Long division 2012-06-07
Emily pose la question :
Simplify the expression using long division (9x^2-41x-6)/(x-4)
Penny Nom lui répond.
Division in base eleven 2012-05-27
Zoe pose la question :
How do you divide numbers that are in base 11?

For example;

9A7A6A divided by A

Penny Nom lui répond.
cos(theta/30) = 1 2012-05-14
Hope pose la question :
cos (theta / 30 = 1
I am very confused as to how to solve it. Can you help?

Penny Nom lui répond.
The dimensions of a rectangle 2012-04-30
Nikki pose la question :
Name the dimensions of a rectangle that has the same area as this triangle? I found the area of the triangle, which is 30. What do I have to do in order to complete this math problem?
Penny Nom lui répond.
Third side of a irregular triangle. 2012-04-27
Darya. pose la question :
How to find third side of irregular triangle if c = 17m, b = 28m and area S = 210m^2.
Penny Nom lui répond.
How to find the base length of a isosceles triangle if only the sides are given? 2012-04-25
aqilah pose la question :
how to find the base length of a isosceles triangle if only the sides are given?
Chris Fisher lui répond.
A rectangular prism 2012-04-05
Tori pose la question :
How do you find the base height if the base width is 10ft. The height is 7ft. And the volume is105ft.
Penny Nom lui répond.
A uniform probability density function 2012-03-26
Noeline pose la question :
The label on a bottle of liquid detergent shows contents to be 12 ounces per bottle. The production operation fills the bottle uniformly according to the following probability density function:
f(x) = 8 for 11.975 ≤ x ≤12.10
and
f(x) = 0 elsewhere

a. What is the probability that a bottle will be filled with 12.02 or more ounces?
b. What is the probability that a bottle will be filled between 12 and 12.05 ounces?
c. Quality control accepts production that is within .002 ounces of number of ounces shown on the container label. What is the probability that a bottle of this liquid detergent will fail to meet the quality control standard?

Penny Nom lui répond.
Forming a triangle from 3 line segments 2012-03-15
rustom pose la question :
A point X is selected at random from a line segment AB with midpoint 0. Find the probability that the line segments AX, XB, and A0 can form a triangle.
Penny Nom lui répond.
The dimensions of a rectangle 2012-03-13
irvyn pose la question :
if you are only given the area and the perimeter how do you find the dimension?
Penny Nom lui répond.
The dimensions of a conical tent 2012-03-04
yash pose la question :
a conical tent is to accommodate 11 people.Each person must have 4m square of space on the ground and 20m cube at air to breathe.Find the height and radius of the conical tent.26202
Penny Nom lui répond.
Integral 1/(25-x^2)^3/2 2012-02-22
John pose la question :
Integral 1/(25-x^2)^3/2
Harley Weston lui répond.
The 10000th day of her life 2012-02-21
derrick pose la question :
Ella was born early in the morning on a Friday.She got married on the 10000th day of her life. What day of the week was it?
Penny Nom lui répond.
Simplify the expression 2012-02-12
Christy pose la question :
Hi guys, ok so I'm having problems with solving this equation since it's been so long I've done precal.
I have to find critical points so I have to find the derivative first. This is what I've done so far s(t)= (t-6)^4 * (t+1)^2
t'= 4(t-6)^3*(1)*(t+1)^2+ 2(t+1)(1)*(t-6)^4
so this is where I got stuck, which is the algebra part. How can I simplify this to get the answer to figure out the critical points.

Penny Nom lui répond.
Litres in a box 2012-02-09
vicky pose la question :
how much litre water can be filled in a box of 12 inches *24 inches *12inches
Penny Nom lui répond.
A tree growth modelled by a geometric series 2012-02-08
Steph 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

Penny Nom lui répond.
The curvature of the earth 2012-02-08
sean pose la question :
Question from sean, a student:

Two people 1.8 metres tall walk directly away from each other until they can no longer see each other (due to the curvature of the earth, which has a radius of about 6378 km).
A) Find a function relating the height of two identical objects with the distance between them using the scenario above as an example.
B) Sketch this function (you may use Graphmatica if you wish). Over what domain and range does the function exist?
C) Describe this relation in practical terms.

Harley Weston lui répond.
The dimensions of a rectangle 2012-01-31
Dazz pose la question :
Hi I was wondering how to find the length of a rectangle if you know the area is 484 square inches And the length is 10 square inches or 22 square inches?
Thanks~Dazz

Penny Nom lui répond.
1 + 3 + 3^2 ...+3^(n-1) = 3^n - 1/2 2012-01-27
Vicki pose la question :
I am trying to find out how to do show how this proof was worked.
Here is the end result 1 + 3 + 3^2 ...+3^(n-1) = 3^n - 1/2

This equation was used to find the number of white triangles in the Sierpinski Triangle

Walter Whiteley lui répond.
Tangent of theta 2012-01-17
stahl pose la question :
explain what the 'tangent of theta' means. Draw and label a diagram to help with your explanation.
Harley Weston lui répond.
One acre of dirt 6 inches deep 2012-01-11
Cameron pose la question :
Ok what im wanting to know is how many pounds of dirt are in 80 acres of land that is 6 inches deep? My friend and I are stumped on this question
Penny Nom lui répond.
The dimensions of a rectangle 2012-01-06
joseph pose la question :
The perimeter of a rectangle is 72 inches. The length of the rectangle is three more than 2 times the width of the rectangle. What is the length of the rectangle? Write and solve an equation to determine the dimension of the rectangle.
Penny Nom lui répond.
Limits and composition 2011-12-30
Rahul pose la question :
I want to know about limit proofs of composite functions. Like limit of log of a function equals log of limit of the function
Penny Nom lui répond.
Three sides of a triangle 2011-12-24
saba pose la question :
the three sides of a triangular lot have lengths 10,11and 13cm,respectively. find the measure of its largest angle and the area of the lot?
Penny Nom lui répond.
The weight of 36 inch steel pipe 2011-12-22
Keith pose la question :
What is the weight of 36 inch steel pipe 3/4 wall per foot in lbs.
Penny Nom lui répond.
i+i^2+i^3+i^4...+i^102 2011-12-13
megan pose la question :
how do you solve i+i^2+i^3+i^4...+i^102
Robert Dawson lui répond.
Simple interest 2011-12-11
sandeep pose la question :
Use the formula I = Prt to solve.

Damon deposits $500 into a savings account that pays simple interest at a rate of 0.65% per year. How long will it take Damon to earn $130 in interest?

Penny Nom lui répond.
Squares and triangles 2011-12-06
Liaqath pose la question :
You have squares and triangles.
Altogether there are 33 sides.
How many squares do you have?
How many triangles do you have?

Penny Nom lui répond.
A suspension bridge 2011-11-30
jennifer pose la question :
suspension bridges like the golden gate bridge, are used to span large distances. when the main curved cables are attached to the deck by vertical cables they will end up in the shape of parabola. assume that we need to build a bridge that spans 2,400 feet. the two towers 165feet tall each where placed at 400feet from either side. the lowest point of the center of the bridge at 10feet. vertical suspension cables where placed at 25foot interval. how many feet of cable are needed to connect the deck to the main cables between the two towers? show all working.
Penny Nom lui répond.
The 3rd term of an A.P is 10 more than the first term 2011-11-29
Olaniyan pose la question :
the 3rd term of an A.P is 10 more than the first term while the fifth term is 15 more than the second term. Find the sum of the 8th and 15th terms of the A.P if the if the 7th term is 7 times the first term.
Penny Nom lui répond.
Converting from base 4 to base 10 2011-11-29
anjg pose la question :
How to convert base 4 number 2^11 to base 10 number?
Penny Nom lui répond.
An arithmetic expression 2011-11-28
Muhmmad pose la question :
2/5*-3/7-1/6*3/2+1/14*2/5
Penny Nom lui répond.
The LCM of 6,15 and x is 90 2011-10-30
Richie pose la question :
Hi there,
There are 2 parts to the question.
#1. Factorise 90. This is easy, 90=2x3x3x5

#2
LCM of 6,15 and x is 90. What are possible values of x if x is odd?

From #1, since 90=6x15, how can this be used to work out possible values of x?

Thanks in advance, Richie

Penny Nom lui répond.
A mythical soccer ball 2011-10-27
Joel pose la question :
We've been working on this problem diligently and can't seem to come up with the answer book's answer. We think it may be wrong, yet want to check it with an expert. Here goes. The school's new soccer balls are covered with 64 regular hexagonal panels. Each hexagon measures 2 inches between opposite corners and 1.5 inches between opposite sides. What is the total surface area of the soccer ball?
Robert Dawson and Lorraine Dame lui répond.
1 divided by 0 and infinity 2011-10-24
ritika pose la question :
we say that one divided by zero gives us infinity, then why zero multiplied by infinity does not gives us one?????????????
Robert Dawson lui répond.
A 6% commission 2011-10-15
Tamara pose la question :
if you earned a gross wage of $810, which includes a salary of $90 and a 6% commission how much is the net sales?
Penny Nom lui répond.
The sides of a regular octagon of area 800 sq. ft. 2011-09-21
Susan pose la question :
Help please. I am building an octagon tree house to live in. I would like the total square footage to equal 800 to 1,000 sq ft. How long should each side of the octagon be.
tx, susan

Penny Nom lui répond.
A four digit number 2011-09-16
gina pose la question :
i am having a hard time figuring this out.. i believe the answer is 3105 but the 0 is throwing me off... i am a 4 digit number between 3100 and 3200, none of my digits are even, the sum of my digits is 9, the largest digit is in the ones place, what number am i ??
Penny Nom lui répond.
Composition of functions 2011-09-05
Jenna pose la question :
Let f(x)=x^2-1 and g(x)=1-2x. Find the indicated values.
1. f(g(1)) and g(f(1))

Thanks,
Jenna

Penny Nom lui répond.
The dimension of the box in centimetres 2011-08-27
Eliza pose la question :
Find the dimension of the box in centimetres. Then find its volume in cubic centimeters. The box is 0.7m (l) 0.4 (h) 0.2 (w)
Penny Nom lui répond.
58 choose 4 2011-08-26
Jean pose la question :
Using only the numbers 1-59, how many times would the number 23 appear in combinations of 5 numbers?
... Can a list be provided as well?
Thank you very much,
Jean

Penny Nom lui répond.
A trapezoid 2011-08-02
Nazrul pose la question :
How can I draw a trapezoid whose parallel sides and other two sides are given.
Chris Fisher lui répond.
The dimensions of a rectangle 2011-05-08
yolanda pose la question :
If the length of a rectangle is 3ft less than twice its width and the area of the rectangle is 54ft^2,what are the dimensions of the rectangle?
Penny Nom lui répond.
The linear thermal expansion of steel 2011-05-03
Scot pose la question :
Several questions on your site deal with the linear thermal expansion of steel. Such as how much will a piece of steel grow in length if it is heated. My question is similar but I would like to know if there is a different calculation to determine how much the diameter of a round bar will grow when heated. Can you tell me how I can calculate how the diameter of .500" round steel will increase for every degree of temperature change? If a bar is raised from 60 degrees F to 120 degrees F how much will the diameter change?
Robert Dawson lui répond.
An exclusion zone around a triangle II 2011-05-03
Aishwarya pose la question :
A long time ago Mr gibson found an island shaped as a triangle with three straight shores of length 3km, 4km and 5km. He declared an exclusion zone around his island and forbade anyone to come within 1km of his shore. What was the area of his exclusion zone? This question was answered but did not understand the explanation.
Robert Dawson lui répond.
(27^r^-1)^-2/3 2011-04-24
Yung-Ju pose la question :
(27^r^-1)^-2/3
Penny Nom lui répond.
Decreasing numbers 2011-04-13
Hadi pose la question :
A number is called a "decreasing number" if each digit in the number is less than the digit to its left. For example, 87420 is a deceasing number. How many five-digit decreasing numbers are there?
Claude Tardif lui répond.
Eliminate y 2011-04-07
Lynn pose la question :
2x + y = 8
y + 3z =5
z + 2w =1
5w + 3x = 9

Form three equations with y eliminated

Penny Nom lui répond.
The rate of change of the area of a parallelogram 2011-04-05
Gevork pose la question :
Let a parallelogram have sides of 8 and 12 and let vertex angle A be decreasing at a rate of 2degrees per minute. Find the rate of change of the area of the parallelogram when angle A equals 30 degrees.
Penny Nom lui répond.
Converting millimeters to centimeters 2011-04-04
Pat pose la question :
I need to convert 67 mm to centimeters how do I do this?
Penny Nom lui répond.
3% commission 2011-04-01
bertha pose la question :
A real estate broker’s base annual salary is $18,000. She earns 3% commission on total sales. How much must she sell in real estate value during the year to earn $65,000? Set up an equation and solve. Show all work to receive full credit. Round final answer to the nearest dollar.
Penny Nom lui répond.
The rectangle is reduced to 90% of its original size 2011-03-31
stephon pose la question :
A rectangle has a length of 4cm and a width of 8cm.

If this rectangle is reduced to 90% of its original size what will be the new length

Penny Nom lui répond.
[(90+36-4) ÷ 2] x 15 = 2011-03-30
ken pose la question :
[(90+36-4) ÷ 2] x 15 =
Penny Nom lui répond.
sin x = -0.25 2011-03-29
Wayne pose la question :
How do you solve for x in the equation sin x = -0.25

the answer is 3.394 and 6.030 but I don't know the steps they used to calculate this

Penny Nom lui répond.
Write 3 1/5 in decimal form 2011-03-24
Stephenie pose la question :
converting fractions????

3 1/5 into decimal???

Penny Nom lui répond.
6(M-1/9)=55/12 2011-03-15
Colleen pose la question :
6(M-1/9)=55/12
Penny Nom lui répond.
The mass of a metal box 2011-03-11
Pamela pose la question :
A metal block has the dimensions of 3.16 inches wide, 2.15 inches high, 4.98 inches long. What is the volume of the block in cm^3? What is the block's mass if the metal has a density of 5.89g/cm^3.
Robert Dawson lui répond.
Vertices and sides of a polygon 2011-03-04
RINA pose la question :
My questions is : would a vertices and sides of a polygon be the same number.  For example, a octagon it has 8 points and 8 sides. Am i correct?
Robert Dawson lui répond.
Find the dimension of the original rectangle 2011-02-28
sandra pose la question :
the perimeter of a rectangle is 40 cm. if the length were doubled and the width halved, the perimeter would be increased by 16cm. Find the dimension of the original rectangle
Robert Dawson lui répond.
A camera's line of sight 2011-02-26
MJ pose la question :
A rocket that is rising vertically is being tracked by a ground level camera located 3 mi from the point of blast off when the rocket is 2 mi high its speed is 400mph At what rate is the (acute) angle between the horizontal and the camera's line of sight changing
Penny Nom lui répond.
Slicing a rectangular parallelepiped 2011-02-23
tom pose la question :
a) Pass a plane containing a vertex of a rectangular parallelepiped and a diagonal of a face not containing that vertex to cut a pyramid from the parallelepiped. What fraction of the volume of the parallelepiped is the volume of the pyramid thus cut off?

b)Pass a plane through a cube of edge 8 in so that the section formed will be a regular hexagon. Through each side of the hexagon pass two planes, one plane containing one of the two vertices of the cube which are farthest away from the plane of the hexagon, the other plane containing the diagonally opposite vertex of the cube. Find the volume of the solid bounded by these planes.

c)three of the edges of a rectangular parallelepiped that meet in a point are also the lateral edges of a pyramid. What fraction of the parallelepiped is this pyramid...?

you know the my only problem is how to illustrate this one...if only i could ...can you help me....all I need is the drawing and I can do the rest ..it's fine if you'll only answer any of these but I'll be thankful if you will do the three :)....

Penny Nom lui répond.
Triangles with perimeter 16 cm 2011-02-22
Chong pose la question :
How many triangles (up yo congruence) with perimeter 16 cm and whose lengths of its side are integers?
Chris Fisher lui répond.
Reversing the digits 2011-02-08
rejie pose la question :
if the digits are reverse , the number is 9 less than the original number.what is the equation?
Penny Nom lui répond.
Calibrating a conical tank 2011-02-05
Bill pose la question :
Hi, I have a round tank with tapered sides where I know the diameter at the top and bottom. Is there a formula I can use to calculate the volume by measuring from the bottom up the side (at the angle of the side) to any given point? Thanks, Bill
Stephen La Rocque and Penny Nom lui répond.
An even multiple of 27 2011-02-01
parth pose la question :
the 6 digit # 63x904 is an even multiple of 27 what is X
Penny Nom lui répond.
The sides of an equilateral triangle 2011-01-27
Cristal pose la question :
Hello :) How can i find the sides of an equilateral triangle when only given the height 10m?
Penny Nom lui répond.
Mathematics and a musical dilemma 2011-01-19
rahul pose la question :
how is mathematics applied in entertainment?
Harley Weston lui répond.
2x = 2+2x 2011-01-15
james pose la question :
2x=2+2x can you help me find what x epauls?
Penny Nom lui répond.
The height of a lamp 2011-01-13
Dorothy pose la question :
I need to find the lamp height with casting shadow (base line of triangle where a boy 1.6m tall stands 3m from base of street lamp and has a 2m shadow. In other words, think of a right angle triangle with zero height starting at left, then 2m to right stands boy (1.6m high). Angle (hypotenuse) increases up to top of street lamp with 'x' height and 3m base.
Penny Nom lui répond.
The weight of a tank 2011-01-11
tom pose la question :
A tank, open at the top is made up of thin sheet iron 1in. thick. The internal dimensions of the tank are 4 ft. 8in. in long ;3 ft. 6 in.in wide ;4ft 4 in. in deep Find the weight of the tank when empty, and find the weight when full of salt water. (Salt water weighs 64 lbs. per cu. ft., and iron is 7.2 times as heavy as salt water)
Harley Weston lui répond.
Set notation 2011-01-10
Ron pose la question :
The question asked in a handout:

8k - 5 < 35, keI

I believe the answer to k is 5. But what does the k e(E) I mean in this?

Harley Weston lui répond.
The third side of a triangle 2010-12-28
andrea pose la question :
in triangle abc, a-b=5 and the area is 50cm2.If angle c- 90degrees, find the length of c.
Penny Nom lui répond.
The thermal expansion of steel 2010-12-20
roger pose la question :
Knowing that the coefficient of thermal expansion of steel is 6.5E-06 in/in/deg F. How do you calculate the loads applied as a result of the expansion?
Robert Dawson lui répond.
A geometric progression 2010-12-15
Abeth pose la question :
find the value of x so that 2(x-1), x+3, x will be a geometric progression.
Penny Nom lui répond.
The value after 30 years 2010-12-15
Abeth pose la question :
At the end of every year, the owners of a building which costs 2, 500, 000 pesos deducts 15% from its carrying value as estimated at the beginning of the year. find the estimated value at the end of 30 years.
Penny Nom lui répond.
A rectangular solid 2010-12-08
ryan pose la question :
Good day! Have a question on rectangular solids. We were asked to find the dimensions of a rectangular solid, we were only given the volume of the rectangular solid, the total area, and the altitude. I tried using the volume of the rectangular solid and was able to get the area of the base, but I don't know how to get its length and its width. Hope you could help me again. Thanks!
Penny Nom lui répond.
Sales as a function of advertising 2010-12-08
Adori pose la question :
The sales S(in thousands if units) of a product after x hundred dollars is spent on advertising is given by S=10(1-e^kx). Find S as a function of x if 2500 units are sold when $500 is spent on advertising.
Penny Nom lui répond.
Simultaneous equations 2010-12-05
ryan pose la question :

Question from ryan, a student:

3         4
--   -    --      =     1      (1)
x         y

7       2             11
--   -  --        =   --       (2)
x       y              12


Chris Fisher and Stephen La Rocque lui répond.
Simplify the logarithmic expression 2010-12-02
Adori pose la question :
Use the properties of logarithms to simplify the logarithmic expression. Log(1/250) base 5
Penny Nom lui répond.
How many gallons of water will it take to fill a classroom? 2010-12-01
deena pose la question :
How many gallons of water will it take to fill a classroom that is 26 feet long by 19 feet wide and 9 feet high? How many tons of water will that be?
Stephen La Rocque lui répond.
Sides and diagonals of a polygon 2010-11-25
nicky pose la question :
The sum of sides of two polygons is 12 and the sum of their diagonals is 19. What kind of polygon are they?
Penny Nom lui répond.
A remainder of 3 2010-11-24
khodr pose la question :
find the smallest number (>3) that , when divided by 6 , 8 , 15 , and 18 , gives a remainder of 3 .
Robert Dawson lui répond.
Determine if a point is inside a cube 2010-11-24
Ali pose la question :
hi every one i have a problem with cube they told me to write a program that determine if a point is inside a cube so i need the equation of the cube to do the comparison. in sphere it is easy sqrt((x-xp)+(y-yp)+(z-zp))<=radios if u please could help me
Robert Dawson lui répond.
A 20" octagon 2010-11-19
CHARLES pose la question :
I have a 20" octagon and it has 8 parts. In inches how big is each part. I was told each part was 5.86".The top of the octagon breaks into 3 equal parts don't equal 20".When i did my math i thought it should be 6 5/8" which is closer to 20"
I am trying to cut a octagon out of a 20"circle

Stephen La Rocque lui répond.
Simple interest 2010-11-17
Abeth pose la question :
At what simple interest rate will a sum of money triple itself in 5 years time?
Penny Nom lui répond.
A six digit number containing no zeros 2010-11-15
John pose la question :
Find a Six digit number containing no zeros in which the first digit is three less than the third, the third digit is three less than the fifth,and the second digit equals the sum of the last three digits.
Penny Nom lui répond.
How far must the pitcher travel to get to the ball? 2010-11-04
ken pose la question :
A baseball player bunts a ball down the first base line. It rolls 35ft at an angle of 26 degrees with the first base path. The pitchers mound is 60.5 ft from the plate. How far must he travel to get to the ball.
Penny Nom lui répond.
The sides of a trapezoid 2010-11-03
Bobbi pose la question :
Isosceles Trapezoid base=60”; two 45⁰angles at base, two 135⁰ angles at the top, vertical distance between base & top=16”. What is the length of the top line and the two equal side lines?
Penny Nom lui répond.
The weight of some dirt 2010-11-03
Maggie pose la question :
I am wanting to know how many tons of dirt we r going to need to fill a basement. The measurements we r going with r 15ftx15ftx8ft.
Penny Nom lui répond.
I have a sign size regulation I have to meet. 2010-10-26
Scott pose la question :
I have a sign size regulation I have to meet. The size is .6 meters squared. at first look this would be 2 ft x 2 ft. I believe it would be larger then that. Can you confirm what the size would be in inches please.
Penny Nom lui répond.
a^(2^n) 2010-10-22
Tim pose la question :
I am trying to understand a^(2^n). The hint they give is a^(2^(n+1)) = (a^(2^n))^2 I am writing a program that will solve a^(2^n) recursively but need to understand the power before I begin. I am currently pursuing writing (a) x (a^(2^(n-1))) where the (a^(2^(n-1))) would be the recursive function call a n approaches 0. Once n is 0, the result would be multiplied by a two more times. Anyway, explaining these powers would be appreciated. I will most likely complete the program before the answer but I want to understand the logic of these powers. Thank you, Tim
Stephen La Rocque lui répond.
Powers 2010-10-20
dylan pose la question :
how do you write 20736 in exponential form .same for 1728 and 50625.

is there a formula to figure out how to express large know numbers in exponential form.

Penny Nom lui répond.
An exponential equation 2010-10-19
Sandi pose la question :

Question from sandi, a student:

I have several questions similar to this one and was wondering if you could walk me through this one. I'm totally lost on how to do it.
Paramecia reproduce by splitting in two. In a laboratory flask, a colony of paramecia had an initial population of 500. Each day, the population of the paramecia was counted. The results are as listed.
Time (in days)------Population
0-----------------------500
1-----------------------600
2-----------------------720
3-----------------------864
4----------------------1037
5---------------------1244
6---------------------1493
7----------------------1792
8---------------------2150
1.)Using graphing calculator make a scatter plot of the data in table.
I think I did this part right I set my window at Xmin=0 Xmax=10 Xscl=1 Ymin=0 Ymax=2500 Yscl=100 Xres=1
2.) Determine an exponential equation to represent the population as a function of time without using a graphing calculator.I have no clue how to do this.
3.)Suppose the flask and food supply is large enough to support the trend of the population growth. Estimate the population of the colony when the time is 10 days.


Penny Nom lui répond.
Simplifying fractions 2010-10-13
Alice pose la question :
14times (9divied3) + 12
______________________
18 divied (26-24)

don't get this.......

Penny Nom lui répond.
Tiles on a bedroom floor 2010-10-07
Rochelle pose la question :
John's bedroom floor is square in shape. He used 625 tiles, with a side length of 200 mm, to tile the whole floor. Calculate the area and dimensions of the bedroom
Penny Nom lui répond.
A division sentence for an array 2010-10-05
Laura pose la question :
On a math test Grace needs to look at an array and write a division sentence for the array. Grace writes 18/3=6 on her answer sheet. Describe what the array on Graces test looks like.
Penny Nom lui répond.
4√3 + 2√1/3 2010-09-25
Michelle pose la question :
How do you solve 4√3 + 2√1/3? Please show step by step.
Penny Nom lui répond.
Six nines 2010-09-16
Steph pose la question :
It's sort of one question. We have to use six nines to get the numbers 1-30. I got all but 22, 23, 24, and 30. Like 15 is 9+9-(9+9+9)/9.
Penny Nom lui répond.
A building and a flag pole 2010-09-09
paul pose la question :
A flag pole and a building stand on the same horizontal level. From the point p at the bottom of the building,the angle of elevation of the top t of the flag pole is 65 degrees. From the top q of the building the angle of elevation of the point t is 25 degrees.If the building is20 meters high. Calculate the distance pt
Penny Nom lui répond.
Disposing of some concrete 2010-08-12
Kathy pose la question :
We are needing to dispose of concrete that we are tearing out of our backyard and I need to figure the dimensions and weight. I figured we have approx. 419 sq ft of concrete at 4" thick. Could you tell me the how much that comes to in cubic ft, cubic yards and weight. So I can get some estimates on pricing to haul off and dispose of. thank you
Harley Weston and Tyler Wood lui répond.
A shrunken car 2010-07-31
Diana pose la question :
Car manufacturers have outdone themselves. They have discovered how to shrink a car to make parking easier. At the touch of a button, a car shrinks by 2 feet in the width and 4 feet in the length. The original car base is 24 square feet longer than that of the shrunken car. If the original cars length is twice the width, find the dimensions of both cars. Identify the unknowns carefully.
Penny Nom lui répond.
70 cubic meters of mulch 2010-07-30
zsuzsi pose la question :
i have 70 cubic meters of mulch to move and an 8 tonne truck to use how much tonnage is to 1 square meter so that i can work out how many trips i need to make
Penny Nom lui répond.
The suspension cables of a bridge 2010-07-29
Mike pose la question :
what is the formula for the suspension cables of a bridge. The towers are 200 ft above the roadway The towers are 3400 ft apart The cable if at 8ft in the middle of the span
Robert Dawson lui répond.
The tonnage of some gravel 2010-07-22
Gregory pose la question :
i have a road that is 8 miles long 20 feet wide and 4 inches deep what is the tonnage for gravel i would need
Penny Nom lui répond.
Simplify (2x)3 2010-07-16
emily pose la question :
how to Simplify (2x)3
Melanie Tyrer and Penny Nom lui répond.
Converting kilograms to cubic metres 2010-07-16
Ilai pose la question :
I want to convert kg to cubic metre
Penny Nom lui répond.
The area of a 4 sided region 2010-07-14
Cliff pose la question :
If I wanted to know the square footage of an area that has four different sides and only had the length of one side and the angles at the ends of that length; could the other lengths be found if I wanted to have a total of 130,680 square feet?
Robert Dawson and Tyler Wood lui répond.
Thermal expansion of a steel beam 2010-06-25
chris pose la question :
If a 50 ft steel beam can expand up to 4inches when heated to 1000f How much will a 162 ft and six inches steel beam expand under the same conditions?
Robert Dawson lui répond.
(x^3 + 11x) is divisible by 6 2010-06-24
PT pose la question :
Given that x is a non-zero integer, how do you show that for all values of x, (x3 + 11x) is divisible by 6?

I know it works but how do I answer the "all values of x" part?

Thanks in advance!

Robert Dawson lui répond.
Expand and simplify 2010-06-15
Alaa pose la question :
Expand and simplify
(x-9)(x+2)

Penny Nom lui répond.
11 trillion divided by 309,418,000 2010-06-05
Dion pose la question :
I am struggling to calculate what 11 trillion divided by 309,418,000 is.
Penny Nom lui répond.
The capilano suspension bridge 2010-06-03
nida pose la question :
the capilano suspension bridge in north vancouver is the world's highest footbridge of its kind. the bridge is 140m long . from the ends of the bridge the angles of depression of a point on the river under the bridge are 41 degrees and 48 degrees. how high is the bridge above the river to the nearest metre
Penny Nom lui répond.
Math in the workplace: nursing 2010-05-24
Taylor pose la question :
How is math used in the workplace - Nurse Anesthetist?
Penny Nom lui répond.
Divisibility by 3 2010-05-23
Cathleen pose la question :
To math central. I have to do a maths extension question that I don't understand. At first I thought I did. It is about the dividing by three. In one part of the question, it asks me to show that the rule of division by three does not work for 23142 with a little 5 down the bottom. What doe base 5 mean? We first thought that the little 5 down the bottom meant multiplying y the power of five. Can you please tell me what it means so I can finish this question?
Penny Nom lui répond.
converting y=mx+b into ax+by+c=0 and vice versa 2010-05-22
Paulo pose la question :
converting y=mx+b into ax+by+c=0 and vice versa
Tyler Wood lui répond.
(x+1)(x+2)(x+3)/(x+1)(x+2) 2010-05-19
Nazrul pose la question :
Simplify : (x+1)(x+2)(x+3)/(x+1)(x+2)
Which answer is correct:
(i) x+3
(ii) (x+2)^2(x+3)
Please help me.

Harley Weston lui répond.
A 22 litre bag of topsoil 2010-05-06
Blanche pose la question :
I do a fair amount of gardening when the weather permits. Just wondered if anyone call tell me what a 22 litre bag of topsoil would weigh and how to convert that. My husband says 20 lbs. I say noway I think it's more. Thanks to whomever can help me. :)
Penny Nom lui répond.
Line of sight 2010-05-06
David pose la question :
I live in St. Joseph, Michigan and there is an ongoing argument regarding line-of-sight over the horizon.

Standing on a 200 foot high bluff here, people swear they can see the top of the Willis (nee Sears) Tower in Chicago, which is about 1653 feet high.

It is my contention that this is actually a "refracted reflection" and not direct-line-of-sight.

So, to settle the argument, I'd sure like some simple explanation for this, even if-and I hope not-I am incorrect.

David

Harley Weston lui répond.
Interest 2010-05-04
RW pose la question :
If you earned 55.00 for a year in your savings acct. The account pays 0.5 % interest. How much money did you initially have in the savings account.
Penny Nom lui répond.
The rejection region 2010-05-01
Mong pose la question :
In Tests of Hypothesis, what is the decision when the test statistic we compute from the sample information is exactly equal to the critical value? that is, we reject null hypothesis or do not reject it? Thanks!
Chris Fisher lui répond.
A geometric progression 2010-04-30
Kalyani pose la question :
sum of infinite geometric progression is 9 and common ratio is 1/10 then sum up to 8 terms is?
Chris Fisher lui répond.
Commission 2010-04-24
TAHIR pose la question :
I want to pre-determine the amount of commission on sale of my product which will be the amount that I shall have to pay .
For example, the price is $ 600and commission 5% .
1) I calculate commission on 600 @ 5% = $ 30
When added $ 600 the retail price = $ 630
2) But on $ 630, 5% commission = $ 31.50
So we make a loss of $ 1.50 .
3) Again if we add this $ 1.50 to $ 630 the price = 631.50
But the commission when calculated does not tally
and we make a loss of $ 0.075.
Please let me know how to determine the commission beforehand so that it matches our accounts.

Penny Nom lui répond.
4 + 10 + · · · + (6n − 2) 2010-04-21
Lan pose la question :
Find the sum 4 + 10 + · · · + (6n − 2). The answer is 3(n^2) + n. How?
Penny Nom lui répond.
Four less than three times a number is 14 2010-04-16
David pose la question :
My daughter has two questions that we could use some help with.

First ?
Four less than three times a number is 14

Secound?
The quotient of -15 and w

Penny Nom lui répond.
Polar coordinates 2010-04-14
Lan pose la question :
Given the rectangular equation (x^2)+2x+(y^2)+y=0, find the polar equation.
Harley Weston lui répond.
Counting by sevens 2010-04-13
Larry pose la question :
Lee counted by 7's beginning with one of the whole numbers from 1 through 7, until Lee passed 1000. If Lee counted three of the following numbers, which number did Lee NOT count?

a. 107
b. 184
c. 534
d. 641

Robert Dawson and Penny Nom lui répond.
6 items are taken 3 at a time 2010-04-12
Kristen pose la question :
Explain the three different scenarios that could occur and would result in the following number of outcomes when 6 items are taken 3 at a time. Give real-life examples.

a. 63 = 6 x 6 x 6 = 216 possibilities

b. 6! / (6 - 3)! = 6 x 5 x 4 = 120 possibilities

c. 6! / (6 - 3)! 3! = 20 possibilities

Tyler Wood lui répond.
A cube with twice the volume 2010-04-11
Woojin pose la question :
From a given cube create another cube with twice the volume. the cube: 5cm each.
Tyler Wood lui répond.
Sample size 2010-03-29
Rae pose la question :
What sample size was needed to obtain an error range of 2% if the following statement was made? "75% of the workers support the proposed benefit package. These results are considered accurate to within + or - 2%, 18 out of 20 times. This seems like a straight forward question but I'm getting it wrong. Could you please help me out even just the set up would be appreciated so I can see if that's where I'm going wrong. Thanks
Harley Weston lui répond.
A radio tower 2010-03-26
Alex pose la question :
The height of a radio tower is 450 feet, and the ground on one side of the tower slopes upward at an angle of 10 degrees. How long should a guy wire be if it is to connect to the top of the tower and be secured at a point on the sloped side 110 feet from the base of the tower?
Harley Weston lui répond.
What is 8.6597 divided by two thirds? 2010-03-22
patsy pose la question :
what is 8.6597 divided by two thirds
Penny Nom lui répond.
A quadrilateral with 4 known sides and 1 known angle 2010-03-19
samuel pose la question :
Name: Samuel
Status: Student

I have a quadrilateral with 4 known sides and 1 known angle, and I'm trying to evaluate the other angles of my quadrilateral.

By the law of cosines, I can easily find my opposite angle (using the diagonal as a basis for the equation).

However, to find the two remaining angles, I have found no other way so far than to use the other diagonal, which can be found with the equation attached (from geometry atlas).

Is there any simpler way?

Robert Dawson and Harley Weston lui répond.
How many zeros? 2010-03-18
jeff pose la question :
1 light yr is 6,500 billion miles, the galaxy "Andromeda" is 2,500,000 million light yrs, how many zeros are in this equation ?
Robert Dawson lui répond.
Repeating Decimal 2010-03-14
Gerald pose la question :
Find the 1987th digit in the decimal equivalent to 1785/9999 starting from decimal point. Can you give us a short but powerful technique in solving this problem? thanks so much..
Chris Fisher lui répond.
A 14 side well house cover 2010-03-12
Kenneth pose la question :
I am 35 yr I am wanting to build a well house cover. I'm trying to figure out how long the pieces need to be and what angle they need to be for a 4 ft dia with 14 side well house. I would love an answer but would also like to know how to figure it in the future. Thanks Kd
Harley Weston lui répond.
The nth derivative of x^(n-1) log x 2010-03-10
shambodeb pose la question :
This is a successive differentiation problem by Leibnitz theorem

If y = xn-1 log x ; Proof nth derivative y(n) = (n-1)!/x

Harley Weston lui répond.
The side length of a square 2010-03-08
tara pose la question :
am trying to help my brother's daughter in maths, tomorrow she has maths exam 1. Area of sq. picture is 441 sq.cm what is the length of its side.
Penny Nom lui répond.
0.999 ^ (500) 2010-03-07
debra pose la question :
I just need to know how to solve the following problem without using a calculator: .999 ^ (500). I know the answer is .606, I just want to do it by hand since I can't use a calculator on my test.
Penny Nom and Claude Tardif lui répond.
The dimensions of a rectangle 2010-03-03
Kirsten pose la question :
A rectangle is twice as long as it is wide. Its area is 128 square meters. What are the dimensions of the rectangle?
Tyler Wood lui répond.
The test for some disease is 99% accurate 2010-02-24
baaba pose la question :
Assume that the test for some disease is 99% accurate. If somebody tests positive for that disease, is there a 99% chance that they have the disease?
Chris Fisher lui répond.
Fahrenheit and celcius 2010-02-19
Carol pose la question :
Zack is packing for a trip to Scotland. He read that the average temperature in the Summer is 18degrees C during the day, and 7 degrees during the night. What is the difference between the high and low temperatures in degrees Fahrenheit? (F=9/5C=32)
Lorraine Dame lui répond.
Square poles 2010-02-16
Steve pose la question :
If 1 pole=16.5', and you have an area that is 146 sq. poles, how many sqaure feet would you have? I calculate that to be 146(16.5)X146(16.5)=5,803,281 sq. feet Is that correct? I am told I need to divide by 146, which makes the answer 39,748. I do not understand why I need to divide by 146....
Penny Nom lui répond.
4-digit positive numbers 2010-02-15
marjon pose la question :
Find the sum of all the 4-digit positive numbers with no zero digit.
Penny Nom lui répond.
The dimensions of a flag 2010-02-15
dawn pose la question :
a state flag was twice as long as it was wide and had an area of 288 sq inches, what were its, dimensions
Thanks

Penny Nom lui répond.
The difference of the two numbers 2010-02-15
Steve pose la question :
The difference of the two numbers 'abcdef ' and ' fdebca ' is divisible by 271. prove that b = d and c = e.
Claude Tardif lui répond.
Can a line segment curve over two planes? 2010-02-14
Graham pose la question :
I am working on a math fair project. Can a line segment curve over two planes? Such as, if I had a three dimensional L bracket and I drew a line segment on it with a marker starting on the bottom of the L and had it curve around the corner and up the top, would it still be considered one line segment? Or is that two line segments? Is there a rule that a line segment can only occupy one plane? Thank you. Graham
Chris Fisher lui répond.
A sequence 2010-02-07
Shalev pose la question :
hi,

i had a job interview yesterday. it had mathematical questions. couldn't solve 1. i m obsessed with it. please find out what the answer is..

it goes like this: 2,4,5,5,8,6,_,_,14,8

thank u very much

Claude Tardif lui répond.
I want to convert my glaze percents into grams 2010-02-05
linda pose la question :
I am a potter. I want to convert my glaze percents into grams. ex. 20% of 20 lbs would equal how many grams? is there a formula to figure this?
Penny Nom lui répond.
An impossible isosceles triangle 2010-01-31
Hailey pose la question :
An isosceles triangle has one angle that measures 50 degrees and another that measures 70 degrees. Why can't this triangle be drawn?
Penny Nom lui répond.
Solving a triangle 2010-01-25
Paige pose la question :
how do i solve a triangle with one angle of 73 degrees, one angle of 32 degrees, and one side of 23cm?
Harley Weston lui répond.
A sequence 2010-01-22
brahmaji pose la question :
0 7 26 63 _ 215 342 fill the blank? find the missing number
Robert Dawson lui répond.
The volume of a silo 2010-01-21
heather pose la question :
The height of the silo is 30ft and the face that rests against a barn is 10 ft wide. If the barn if 5 ft from the center of the silo what is the capacity of the silo?
Penny Nom lui répond.
Area in square meters 2010-01-20
Carla pose la question :
A football field is 120 yd long and 50 yd wide. What is the area of the football field, in square meters?
Penny Nom lui répond.
How fast am I walking? 2010-01-10
KEVIN pose la question :
IF I WALK 3 MILES IN 28 MINUTES, HOW FAST AM I WALKING?
Penny Nom lui répond.
The intervals where the function is positive and negative 2010-01-10
Ron pose la question :
Hello

I'm trying to find out the intervals where the function is positive and negative. It's for a polynomial function y= -(x+2)^2 (x-2) and y= (x+1)(x+4)(x-3)

I have tried the right and left side of each x-intercepts, but I still don't understand the results

thank you for your help

Penny Nom lui répond.
A pair of simultaneous equations 2010-01-09
Yumiko pose la question :
Solve the following pair of simultaneous equations.

x^2 -4x = y^2-4
3y=2x - 3

Penny Nom lui répond.
Linear programming using the Simplex Method 2009-12-28
William pose la question :
A gold processor has two sources of gold ore, source A and source B. In order to keep his plant running, at least three tons of ore must be processed each day. Ore from source A costs $20 per ton to process, and ore from source B costs $10 per ton to process. Costs must be kept to less than $80 per day. Moreover, Federal Regulations require that the amount of ore from source B cannot exceed twice the amount of ore from source A. If ore from source A yields 2 oz. of gold per ton, and ore from source B yields 3 oz. of gold per ton, how many tons of ore from both sources must be processed each day to maximize the amount of gold extracted subject to the above constraints? I need a linear programming solution or algorithm of the simplex method solution. Not a graphical solution. Thanks.
Janice Cotcher lui répond.
Stefan-Boltzmann Law 2009-12-28
florence pose la question :
Hi- I have a college tutor and we are stumped with this question. Assuming a filament in a 100 W light bulb acts like a perfect blackbody, what is the temperature of the hottest portion of the filament if it has a surface area of 6.3 X 10^-5 m^2? The Stefan-Boltzmann constant is 5.67 X 10-4 W/(m^2 X K^2.\ Thank you for your help. If you can only answer one question per day please answer this one and guide me through a solution.
Janice Cotcher lui répond.
Finding Density Given Volumetric Thermal Expansion Coefficient 2009-12-26
florence pose la question :
Hi- Please help me to apply the formula for this problem. The coefficient of volumetric for gold is 4.20 X 10^-5 C degrees. The density of gold is 19,300 kg/m^3 at 0.9 C degrees. What is the density of gold at 1050 degrees C. Could you please explain how to get the solution of 18,500 kg/m^3 Thank you for your help Florence
Janice Cotcher lui répond.
Triangles on a base of 2.4 meters 2009-12-26
Allan pose la question :
Please,How do I calculate the height of a triangle when I only know the width of the base line,It is 2.4 mtrs.
Thankyou very much.

Penny Nom lui répond.
Finding Specific Heat of a Substance 2009-12-26
erin pose la question :
Hi- 2 kg metal requires 1.00 X 10^4 J of heat to raise its temperature from 20 degrees C to 40 degrees C. What is the specific heat capacity of the metal?
Janice Cotcher lui répond.
A trig question 2009-12-15
A trig question pose la question :
Hey, my name is Candle
I'm in academic math10 and am stuck on my trig... one question I thought I had right because i used the cosine law I got wrong and can't figure out why... here's a copy of the question. (i guessed it was D... but my teacher said it's B)
Thanks
Candle

Robert Dawson lui répond.
Energy in calories 2009-12-15
Josephine pose la question :
A soft drink manufacturer claims that a new diet soft drink is now "low Joule". The label indicates that the available energy per serving is 6300 J. What is the equivalent of this energy in calories? (1 Calorie=1000 cal)
Robert Dawson lui répond.
A telephone pole on a slope 2009-12-14
Marissa pose la question :
A 10 meter telephone pole casts a 17 meter shadow directly down a slope when the angle of elevation of the sun is 42 degrees. Find the angle of elevation of the ground. Its a law of sines problem.
Penny Nom lui répond.
A number base that's not a positive integer 2009-12-11
Nick pose la question :
Is it possible for a number to have a base that's not a positive integer? Base 1 gives a result that's meaningless but possible. I have no concept of a base 0, a negative base, or a fractional base, never mind any other base. I think there isn't any base that's not a positive integer, but, knowing that math keeps jumping ahead and sometimes has inventions before anyone knows how to exploit them, I think I'd better ask.

Thank you.

Nick

Robert Dawson and Claude Tardif lui répond.
How fast is the distance between the two cars decreasing? 2009-12-08
Jenny pose la question :
Two cares are on a collision course toward point P. The paths of the two cars make a 30 degree angle with each other. The first car is 40 km from P, and traveling toward P at 16 km/hour. The second car is 50 km from P, traveling at 20 km/hour. How fast is the (straight line) distance between the two cars decreasing. (Hint: Law of Cosines)
Harley Weston lui répond.
Simplifying a quadratic expression 2009-12-07
Sabbie pose la question :
Hi, I need help solving this equation for my physics homework,so I can solve the quadratic equations for x and y. I've derived the following equations from the information provided in the question.

2a+3b = 4 -- 1
2a^2 + 3b^2 = 62 -- 2

a=2-(3/2)b is substituted into equation 2.

so, i get
2 (2-(3/2)b)^2 + 3b^2 = 62

this is where the problem begins. i cannot work through this to get to the correct quadratic equation

5b^2-8b-36=0

I can't seem to be able to figure out where I keep going wrong. I would really appreciate it if you could give me a step-by-step breakdown of the workout.

thanks!

Penny Nom lui répond.
(9 - x^2)/(x - 3) 2009-12-04
Sandy pose la question :
9-x^2/x-3
I need to know how to solve this.
Thanks

Penny Nom lui répond.
Milliliter conversion 2009-11-29
Jan pose la question :
I am trying out a new bath salt recipe for one of my clients that has little children. Here then is the question, the recipe for color changing bubble bath calls for 0.15ml dry FD&C color. Since the recipe came from Australia, I have not a clue of how to change this into USA measurments
Penny Nom lui répond.
Six-letter words 2009-11-24
christine pose la question :
How many six-letter words (not necessarily an English words) are there in which exactly three of the letters are z's?
Claude Tardif lui répond.
Solving two equations, one with a square root 2009-11-23
kacie pose la question :
y = square root of x+3
x-4y = -7

im having trouble with this problem...i have to find where they intersect.

Harley Weston lui répond.
A simplification 2009-11-21
Lou pose la question :
In the following problem, [(7)/(x+2)]-[(x+8)/(4-x^2)]+[(3x-2)/4-4x+x^2)] what steps do you use to convert the middle portion to become +[(x+8)/(-4+x^2)]? The answer to the problem is supposed to be (11x^2-18x+8)/(x+2)(x-2)^2
Penny Nom lui répond.
Three angles and one side of a triangle 2009-11-16
Esther pose la question :
How do i find the sides of an acute triangle if i know the angels are 60,45,75 and i only know one side which is 10? Thanks!
Penny Nom lui répond.
Two similar pentagons 2009-11-16
louis pose la question :
The lengths of five sides of a pentagon are 1,3,5,7,and 12 units. If the length of the longest side of a similar polygon is 18 units, find the perimeter of the larger pentagon. I think I figured it out Not sure though.
Penny Nom lui répond.
The line through D(-4, 0) and E(2, 6) 2009-11-16
Rogerson pose la question :
The point F is on the line through D(-4, 0) and E(2, 6) so that DF=4DE. Find the coordinates of F.
Penny Nom lui répond.
A drawing of a baseball diamond 2009-11-09
Beth pose la question :
My husband has a drawn diagram on a piece of paper of a baseball diamond. He knows that on the paper 1 1/16" (1.6875") = 90 actual feet. How do we calculate how many feet 5 7/8" on the paper would be?
Penny Nom lui répond.
3x^3-3x-3 and 3x+6 2009-11-04
spencer pose la question :
My question is 3x^3-3x-3 devided by 3x+6
Penny Nom lui répond.
Density of dirt and gravel 2009-10-26
ken pose la question :
if digging a load of dirt and gravel in mining how many yards of material to the ton thanks
Penny Nom lui répond.
Grams per square meter 2009-09-30
MANISH pose la question :
how to calculate gsm given kg of 144 sheets and size in inches example 28" x 22" & 16.3 kgs = ?gsm (of 144 sheets)
Penny Nom lui répond.
Sawdust 2009-09-29
joel pose la question :
What is the density of saw dust
Harley Weston lui répond.
Grams to percent 2009-09-20
brandy pose la question :
how do you convert 1.5 grams to a percent
Stephen La Rocque lui répond.
A sequence 2009-09-19
Oliver pose la question :
I am struggling to work out the missing terms in the following sequence:

1, 3, _, 7, 11, 18, _

Chris Fisher lui répond.
Repeating decimal to fraction 2009-09-18
joan pose la question :
how can i answer it easily to convert terminating decimal to fraction? example of this is that, convert ...143143143... to fractional form
Robert Dawson lui répond.
Quotient 2009-09-14
Jala pose la question :
What is a quotient and what are the instructions for one?
Penny Nom lui répond.
Simplify 2009-09-04
Sarah pose la question :
How do you simplify: (x-4)^3?
Robert Dawson lui répond.
Simultaneous equations 2009-08-28
onias pose la question :
solve 3/a - 2/b = 1/2 , 5/a + 3/b = 29/12
Robert Dawson lui répond.
How do you convert cents/mile to dollars / hour? 2009-08-26
seanna pose la question :
how do you convert cents/mile to dollars / hour
Penny Nom lui répond.
A paper towel roll 2009-08-19
Jeff pose la question :
I am making a spiral tube with paper that is 2" in dia. and 102" long I will be using paper that is slit 3" wide how many lineal feet of paper will I need to to cover the 102" I will be using 3 rolls of paper that will over lap the other by half to make a hard tube (paper core) in a roll of paper towels Thanks Jeff
Penny Nom lui répond.
How do i convert 6 feet into yards? 2009-08-14
taylor pose la question :
how do i convert 6 feet into yards?????????????????
Robert Dawson lui répond.
Fitting the curve y=a*exp(b*x)+c 2009-08-12
aika pose la question :
Could one show me the complete algorithm and formula for finding the coefficients (a,b, and c) in exponential regression model y=a*exp(b*x)+c
Robert Dawson lui répond.
Gravel in an aquarium 2009-08-09
Bev pose la question :
Hi...I worked this part out, but want to know how many kilograms of gravel I will need...thanks Bev

Cylinder shape.

A cylindrical shape that has a radius of 82 centimeters and a depth of 7 centimeters has a volume of: Volume

= 0.14787 cubic meters
= 147870 cubic centimeters
= 0.1934 cubic yards
= 5.2219 cubic feet
= 9023.5 cubic inches
= 39.063 U.S. gallons
= 147.87 liters
* calculations accurate to 5 decimal places of precision

Harley Weston lui répond.
Eye Height Level Found from Visual Angle 2009-08-07
Jolie pose la question :
Hello, I am trying to figure out what height from the ground a person's eyes are if they have a 12 degree visual angle to a screen that is 58cm away from their eyes? Thank you.
Janice Cotcher lui répond.
Dimensions 2009-07-29
Deborah pose la question :
The blueprint for landscaping a yard has a scale of 1/2" to 1 foot. If the blueprint is a rectangle 18 inches by 22 inches, what are the dimensions of the yard?
Robert Dawson lui répond.
x^3+1/x^3=18*sqrt(3) 2009-07-08
Nazrul pose la question :
If x^3+1/x^3=18*sqrt(3) then how can I evaluate the value of x+1/x? Thank you for your help.
Robert Dawson lui répond.
The sides of a triangle 2009-07-08
Susan pose la question :
The second side of a triangle is 5ft more than the length of the first side. The third side of the triangle is 10ft less than the length of the first side. The perimeter of the triangle is 61ft. Find the lengths of each side of the triangle.
Thank you so much!

Penny Nom lui répond.
Simultaneous Equations 2009-07-06
Mukulu pose la question :
Solve the equation simultaneously X/5=(Y+2)/2= (Z-1)/4 ……………….eqt 1 3X+4Y+2Z-25=0 ………………eqt 2
Janice Cotcher lui répond.
Coefficient thermal expansion of steel 2009-06-29
roshni pose la question :
Coefficient thermal expansion of steel is 0.00000645/in/in/deg F if F was C(celcius) then what is the answer
Robert Dawson lui répond.
The dimensions of a cuboid 2009-06-24
laura pose la question :
a cuboid has the surface area of 842 cm2, can you work out the dimensions?
Robert Dawson and Harley Weston lui répond.
Cubic meters of gravel in a 7 ton lorry 2009-06-21
Jackie pose la question :
I have to transport gravel in a 7 ton lorry and I know how many cubic meters of gravel I need, but I need to know how many cubic meters of gravel a 7 ton lorry can hold.
Thanks, Jackie

Penny Nom lui répond.
Two questions from math class 2009-06-18
Con pose la question :
Hello,

My name is Con and my son is required to answer the following questions for his maths class.

He has attempted Q1 through trial and error and has found the answer to 72453. Is this correct?

He has attempted to draw the triangles described in Q2 in a number of ways and has found that BE can not equal ED and is dependent of angle BAC. Therefore, he claims that the triangle can not be drawn/practical. Is this correct or is there a slolution?

Q1.
Digits 2, 3, 4, 5 and 7 are each used once to compose a 5-digit number abcde such that 4 divides a 3-digit number abc, 5 divides a 3-digit number bcd and 3 divides a 3-digit number cde. Find the 5-digit number abcde.

Q2.
Let ABC be a triangle with AB=AC. D is a point on AC such that BC=BD. E is a point on AB such that BE = ED = AD. Find the size of the angle EAD. Con

Chris Fisher lui répond.
Successive differences 2009-06-18
Jonathan pose la question :
I'm trying to find the next number sequence for this equation: 1 11 35 79 149 251, my problem is that I worked it out and ended up with a single number 17. What am I doing wrong. Thank you for any help.
Robert Dawson and Penny Nom lui répond.
Thermal Expansion of Steel 2009-06-17
Ken pose la question :
Hi there, We are rollforming steel roofsheeting in 65M lengths and the = question of linear expansion has cropped up.I would like to know what = the expansion rate of this sheet would be over a temperature rise of say = 40degree F.in mm per Meter or whatever the norm is. The sheet is 0.53mm = thick and is 700mm in width,I hope this is sufficient info to enable you = to do your calculation.Many thanks, in anticipation. Ken
Janice Cotcher lui répond.
Divisibility 2009-06-17
Sophia pose la question :
Hello
Please help my son with the solutions to the following:

a) Determine the remainder when 2^2009 + 1 is divided by 17;
b) Prove that 30^99 + 61^100 is divisible by 31;
c) It is known that numbers p and 8p^2+1 are primes. Find p.

Again, your assistance is greatly appreciated.
Thanks
Sophia

Robert Dawson lui répond.
Vectors and the Law of Cosine 2009-06-08
lauren pose la question :
once force of 20 pounds and one force of 15 pounds act on a body at the same point so that the resultant force is 19 pounds. Find, to the nearest degree, the angle between the two original forces
Janice Cotcher lui répond.
Initial Velocity of a Car Plunging Off a Cliff 2009-06-07
Mimi pose la question :
A car fails to take a sharp turn on a flat road and plunges off a cliff. The car lands 65m horizontally and 43m vertically from where it left the edge of the cliff. How fast was the car travelling?
Stephen La Rocque lui répond.
The dimensions of a rectangle 2009-05-30
Linda pose la question :
A rectangle has a perimeter of 38 feet & an area of 48 square feet. What are the dimensions of the rectangle?
Stephen La Rocque lui répond.
A sequence 2009-05-26
Jay pose la question :
what is the equation that would give me the next 3 numbers in this progession: 0,1,5,14,20
Stephen La Rocque lui répond.
The quotient of 5/8 divided by7/4 2009-05-25
tammy pose la question :
find the quotient of 5/8 divided by7/4
Stephen La Rocque lui répond.
The Smythe family lot 2009-05-24
Shrima pose la question :
We must determine the size of the lot. The Smythe family lot is 235ft across the front and 212ft down the side and 254ft down the other side. The sides of the lot are parallel to each other and perpendicular to the front. The size of the lot is two dimensional measure therefore you need to find the areaenclosed by the lot line.
Question:

What is the size of the Smythe lot including the unit?

Penny Nom lui répond.
The position of the fulcrum 2009-05-23
jim pose la question :
I think I need a formula. I need to know how far an object will be lifted. A beam is 246 inches long on one side of the fulcrum, and 41 inches on the other side, if I push down 36 inches on the long side of the beam, how much will the short side move up?
Stephen La Rocque lui répond.
A geometric progression 2009-05-16
sweta pose la question :
find the ratio of GP if the first term is 1 and the sum of third and fifth term is 90.
Penny Nom lui répond.
Unit Conversion for Force and Mass 2009-05-08
Ray pose la question :
Good Day! I was confused about lbm and lbf and slug. I knew that lbm is a unit for mass and lbf is a unit for weight. my problem is some books follow this relationship where lbf=(lbm times the gravitational pull) which is 32.2 ft/(s^2) while other books treat lbm=lbf. other books also treat lbm=(lbf times 32.2)... which is correct? Is 1kg=2.205 lbm or 1kg=2.205lbf? Is 1BTU=778.16 lbf-ft or 1BTU=778.16 lbm-ft? what is the relationship of slug on these two, lbm and lbf?
Janice Cotcher lui répond.
Cubic feet and cubic yards 2009-05-08
TJ pose la question :
21 bags at 2 cubic feet per bag. How many yards would that be?
Penny Nom lui répond.
The dimensions of a toy chest 2009-05-07
charlotta pose la question :
My son needs to find the 3 dimensions of a toy chest that has to have a volume of 24 cubic feet can you show how to get the answer
Penny Nom lui répond.
8.55 acre of land 2009-05-06
Mary pose la question :
I have a deed with 8.55 acre of land, how much land is that .55 ?
Robert Dawson lui répond.
-5^2= -25 2009-05-06
tracy pose la question :
show how to perform this calculation and why -5^2= -25
Robert Dawson lui répond.
How do you convert 1248 to base 6? 2009-05-02
Tamara pose la question :
How do you convert 1248 to base 6?
Penny Nom lui répond.
Decimeters and centimeters 2009-04-30
Jeannette pose la question :
I cannot convert because of a question that throws me off. For example, A mother African elephant avg's 250 dm in height. A newborn baby African elephant avg's 89cm in height. How many cm shorter is the baby African elephant than its mother? Which one do I convert first? in order to subtract the number from the baby?
Penny Nom lui répond.
The volume of 3-D figures 2009-04-29
Serena pose la question :
What is the formula for finding the volume of 3-D figures
Robert Dawson lui répond.
The integral of a to power x squared 2009-04-28
JIM pose la question :
WHEN I ATTENDED U.OF T. (TORONTO ) MANY YEARS AGO WE WERE TOLD THE FOLLOWING INTEGRAL COULD NOT BE SOLVED : a to power x squared . is this still true ?

CURIOUS , JIM

Robert Dawson lui répond.
An odd shaped lot with a curve to it 2009-04-25
Chris pose la question :
Hi - Im trying out to figure out how to calculate the size of an odd shaped lot with a curve to it.

Chris

Harley Weston lui répond.
2+6+12+20+30+42 2009-04-24
fredy pose la question :
what is the sigma notation for the series 2+6+12+20+30+42?
Stephen La Rocque lui répond.
Miles per hour and feet per second 2009-04-22
mary pose la question :
A car traveling at 60 miles per hour, how many feet per second has it traveled?
Robert Dawson lui répond.
Percent increase from a negative number to a positive number 2009-04-21
Brian pose la question :
I have no problem calculating year over year net profits but am having trouble when it comes to a negative.
2007 Net Profit = -110,333.00
2008 Net Profit = 66,054.00

Brian

Harley Weston lui répond.
Two regular hexagons 2009-04-21
niko pose la question :
Two regular hexagons are ____________ similar.
Stephen La Rocque lui répond.
Two similar rectangles 2009-04-19
Alyssa pose la question :
The ratio of the lengths of corresponding sides of two similar rectangles is 3:5. the small rectangle has an area of 36 square centimeters. What is the are of the large rectangle?
Penny Nom lui répond.
A four-sided lot 2009-04-12
Robert pose la question :
back of property is 137' across,with an angle of 122deg.on the left side and an angle of 140 deg. on the right side,the left side is 123' and the right side is 93' long,the left front is 130 deg. and the right front side is 150 deg. and the front of the property measures 78'
Harley Weston lui répond.
A fraction in its simplest form 2009-04-02
Michael pose la question :
I'm in 4th grade and need to express decimals as a fraction in its simplest form. Is there a step by step method to figure out?

ex 0.64 = 64/100 = ?

Robert Dawson lui répond.
Thirty-two divided by 3 2009-04-02
Shelly pose la question :
x = 32/3

x = 10 2/3 Divide 32 by 3: 32 / 3 = 10 R2.

What I don't get is why is it that 10 with a remainder of 2 ( 10 R2 ) equals 10 2/3? shouldn't it be 10 2/10 ?????

Robert Dawson lui répond.
A spherical Tootsie Roll Pop 2009-04-01
Tracy pose la question :
A spherical Tootsie Roll Pop you are sucking on is giving up volume at a steady rate of .8 ml/min. How fast will the radius be decreasing when the Tootsie Roll Pop is 20 mm across?
Harley Weston lui répond.
Four identical lots 2009-03-30
Marina pose la question :
I really want to know the answer to this problem for my 6th grade son. I've already sent this question with the drawing but I couldn't send it correctly. I hope this one will pass through. Q: Divide evenly and identical the figure representing a lot, into four for the 4 siblings. I've sent a figure drawing as attachment. I will describe this in case it will not reach you: its a square divide into 4 triangle and 1 triangle is taken out living a letter M figure and this letter M figure is the one that will be divided.into 4 even and identical parts.

Marina

Claude Tardif lui répond.
Adding in base six 2009-03-29
Lucy pose la question :
If you are working in base 6, what do you have to add to 4(base 6) to get 10(base 6)????
Penny Nom lui répond.
Subdividing a four-sided lot 2009-03-27
kannan pose la question :
i have a 1.5 acre land having four sides
A-B=64.8 meters
B-C=94.2 meters
C-D=54.4 meters
D-A=127.2 meters
angle at D is 90
the side AB (frontage)is road facing i want to split the plot in to two halves having same almost area and almost equal frontage, kindly help me, if possible explain with drawing.

Regards
Kannan

Harley Weston lui répond.
Dividing by fractions 2009-03-25
Mitch pose la question :
-2 divided by -2/3 = ??
Penny Nom lui répond.
Comparing positive and negative fractions 2009-03-24
Christyrose pose la question :
Hello. I am a sixth grade math student and i need help on how to compare negative and positive fractions.

Here is is:
3/4 -2/3 7/10 -5/6

I'm not sure how to do the negative parts because i was absent for a couple days. Thank you!

Christyrose

Penny Nom lui répond.
Conversion factor 2009-03-23
kab pose la question :
Would like to photocopy a Landscape Design. What is the Conversion Ratio or magnification required to convert 1" = 10 feet to 1/4" = 1 foot?
Harley Weston lui répond.
A rectangular open box 2009-03-21
tina pose la question :
An open box is to be made from a rectangular piece of tin by cutting two inches squares out of the corners and folding up the sides. The volume of the box will be 100 cubic inches. Find the dimensions of the rectangular piece of tin.
Stephen La Rocque lui répond.
A 20 foot piece of pipe 2009-03-19
chris pose la question :
How many 8 inch pieces can you get from a 20 ft. piece of pipe?
Penny Nom lui répond.
0.0007 as a percent 2009-03-18
Shelly pose la question :
I need to know how to divide 0007 by 100 and soon! and I have no idea how I can get 100 to go into a number like that! here's the question this problem originated from:

change the decimal into a percent:
0.0007 _________

How do I change THAT number into a percent?

How do I change 12.455 and 92.348 and 29.005 into percents as well? I know how to change numbers like 0.6 and 0.70 into percents but not the numbers I told you I'm having problems with. Please someone explain this to me and also please focus mainly on the first number I asked about but don't forget the others please. Please reply ASAP I need to know this in about a week or less!

Penny Nom lui répond.
The sides of a parallelogram 2009-03-17
Sami pose la question :
If ABCD is a parallelogram, prove that line AB is congruent to line CD. Clearly state your reasons and conjectures.
Penny Nom lui répond.
An impossible trig problem 2009-03-14
Alisha pose la question :
If csc theta = 3 and sec theta = square root of 3, what are the values of tan theta and cos^2 theta?
Harley Weston lui répond.
Related rates 2009-03-14
Jeevitha pose la question :
The side of an equilateral triangle decreases at the rate of 2 cm/s. At what rate is the area decreasing when the area is 100cm^2?
Stephen La Rocque lui répond.
A polyhedron 2009-03-10
Mollie pose la question :
Hi, my name is Mollie and I'm in 5th grade. Here's the math problem I have for homework tonight:

"Larissa made a model of a polyhedron using 8 pieces of clay for the vertices and 18 straws for the edges. What type of polyhedron did Larissa make?" Thanks.

Penny Nom lui répond.
Related rates 2009-03-09
Megan pose la question :
A plane flying with a constant speed of 330 km/h passes over a ground radar station at an altitude of 3 km and climbs at an angle of 30°. At what rate is the distance from the plane to the radar station increasing a minute later?
Harley Weston lui répond.
What percent commission does Aaron earn? 2009-03-09
Jerry pose la question :
Aaron works part time as a salesperson for an electronics store. He earns $4.75 per hour plus a percent commission on all of his sales. Last week Aaron worked 20 hours and earned a gross income of $143.75. If his total sales for the week were $1,500, what percent commission does Aaron earn?
Penny Nom lui répond.
The sides of a triangle 2009-03-07
felicia pose la question :
ona map, tannersville, chadwick, and barkersvile for a triangle. Chadwick is 70 miles from Tannersville and Barkersville is 90 miles from Tannersville. Which is a possible distance between Chadwick and Barkersville?
a. 5miles
b. 10 miles
c. 150miles
d. 200 miles

Harley Weston lui répond.
The amount of material remaining on a reel 2009-03-04
James pose la question :
Question from james:

I am after a standard calculation so that after each usage of the Reel I can get the Remaining Quantity in kilos left on the roll

below is an example of roll

THICKNESS: 30 MICRON
REEL WIDTH: 7.5 CM
REEL DIAMETER: 76 CM
REEL WEIGHT: 7.13 KILOS

The core centre has a 9cm diameter, the weight of the roll is excluding the core , and after each use the diameter of the role is measured.

I am a factory supervisor working on project and need this calculation info for template.. Thanks James

Harley Weston lui répond.
A shape with 10 sides 2009-03-03
Sandra pose la question :
One of my son's math questions is as follows: Suppose I have a shape with 10 sides. I choose a vertex then draw lines to the other vertices that dont share sides with the first vertex. How many vertices will that be and why?
Penny Nom lui répond.
The area of a 5-sided lot 2009-03-02
Linda pose la question :
I have a problem I'm hoping you can provide some help with. When I check the property information for our home on our District of North Vancouver website, it shows that our property is supposed to be 1146.99 Square Metres. Yet another property which has identical measurements is listed as having 1173.7 Square Metres. I would like to figure out who is correct.
Harley Weston lui répond.
An array with 2 more rows than columns 2009-02-28
Mario pose la question :
Write a division sentence modeled by an array that has 2 more rows than the number in each row.
Penny Nom lui répond.
Simplify the square root of 125 x^2 2009-02-27
Ashley pose la question :
√125x²

How do you simplify this equation assuming that variables can represent any real number?

Robert Dawson lui répond.
Triangles within triangles 2009-02-24
Mari pose la question :
a large shaded triangle changes each day with a white triangle appearing in the center of each shaded one. If this pattern continues, how many white triangles will be there on the 6th day? On the 6th day, what fraction of the large outer triangle will be white?THANKS!
Robert Dawson lui répond.
Augmented matrix: independent, dependent, or inconsistent? 2009-02-23
Anna pose la question :
Perform row operations on the augmented matrix as far as necessary to determine whether the system is independent, dependent, or inconsistent.

x + y + z = 11
x - y + 3z = 5
2x + 2y + 2z = 15

Harley Weston lui répond.
Pressure at Given Depth 2009-02-22
Tamara pose la question :
A sea is 3km deep. The average density of sea water there is 1020 kg/m^3. What is the water pressure at the bottom?
Janice Cotcher lui répond.
Find the resultant of this displacement pair 2009-02-22
katydidit pose la question :
Find the resultant of this displacement pair:
500 miles at 75 degrees east of north and 1500 miles at 20 degrees west of south.
How do I graph this and how do I solve this problem?

Penny Nom lui répond.
What deminsions should my box be? 2009-02-19
Mary pose la question :
My item is 57cm x 36cm x 6cm and I want to put 20 items is 1 box. What deminsions should my box be?
Stephen La Rocque lui répond.
Angle of depression 2009-02-18
Meeka pose la question :
An aircraft flying at an altitude of 2000m is approaching an airport. If the angle of depression of the airport is 5 degrees, what is the distance from the plane to the airport measured along the ground? Round your answer to the nearest tenth of a kilometer.
Robert Dawson lui répond.
Miles per hour to kilometers per second 2009-02-17
Tamara pose la question :
If a car goes 60 miles in an hour how many kilometres will it go in a second?
Penny Nom lui répond.
Rent and a commission 2009-02-17
cliff pose la question :
a landlord receives $95.00 rent 5% commission was paid to get to $95.00 what was the original number. The answer is obvious but what is the formula. Thanks. Cliff
Penny Nom lui répond.
The sides of a polygonal building 2009-02-13
mark pose la question :
length of sides of an 18 ft.diameter bldg

i need to find out if i should build an octagon or decagon to keep the sides of the bldg at 8ft or less. how do i figure the length of the sides of each?

Penny Nom lui répond.
Can you convert numbers with units to percents? 2009-02-12
Kenneth pose la question :
To change a number to a percent, move the decimal two places to the right and add a percent sign. For example, 0.35875 = 35.875%.
If the number has a dollar sign or some other kind of unit, for example, pounds, feet, etc. how is the number converted to a percentage.

For example, change $0.35875 and 0.75 lbs. to a percentage. How is this done. I have never seen $35.875% or 75 lbs.% before.

Robert Dawson and Harley Weston lui répond.
Cubic feet gas to grams of gas 2009-02-11
tim pose la question :
I was trying to convert cubic feet gas to grams of gas. Is there a formula to complete this task?
Robert Dawson lui répond.
Cubic centimeters and ounces 2009-02-06
Dawn pose la question :
1-- syringe contains 5.5cc of medicine & cost $13.50
1 --2 oz bottle of medicine cost $17.50

How many cc's in 2 oz, & which is the better deal?

Stephen La Rocque lui répond.
A 30-60-90 triangle 2009-02-03
Inez pose la question :
If you have a 30-60-90 triangle and the only side you get is 73 and a 90 degree box, how do you find the area?
Penny Nom lui répond.
Calculating markup 2009-02-03
Tonya pose la question :
I'm trying to figure out the formula for the following, I have a product that I want to receive a certain profit, but with this product I also have to pay a percentage of commission to someone. I need to know how to calculate my new selling price taking into account the markup percentage, but I don't want my cut to be lowered. I have calculated the markup percentage to get my new selling price with the commission, but it lowers my cut once I pay the commission and I don't want it to do that. Thanks
Penny Nom lui répond.
Simultaneous equations with an xy term 2009-02-01
angelee pose la question :
xy+5x-2y-10=0 2x+y=1
Penny Nom lui répond.
limit sinx/x 2009-01-30
Jackie pose la question :
how to evaluate limit sinx/x as x tends to zero if x is in degrees
Stephen La Rocque and Harley Weston lui répond.
25,000 pounds of sheet metal 2009-01-27
JESSICA pose la question :
I need to convert 25,000 lbs. of 32x48 sheet metal into total sq. feet. What would be my formula?
Robert Dawson lui répond.
The dimensions of a pool 2009-01-18
denise pose la question :
a rectangular swimming pool is three times as long as it is wide. if the perimeter of the pool is 320 feet, what are its dimensions
Penny Nom lui répond.
The whole number that precedes a number w+3 2009-01-17
Morgan pose la question :
write a variable expression for "The whole number that precedes a number w+3"
Penny Nom lui répond.
Fuel in a tank 2009-01-16
Steve pose la question :
I am not a math expert and want help seeing how much fuel is in a tank at one given time the tank that i have is 27 inches round. It is 69 inches long. laying length ways. it holds 140 gallons of fuel at fill up. I do know that it would hold less at the bottom of the tank an more in the center. Is there anybody that could just give me the figures by the inch without a formula. thanks for your time
Stephen La Rocque lui répond.
0.0708 lbs per linear yard 2009-01-16
Kevin pose la question :
If I know that my product is .0708lbs per linear yard how do I calculate how many Linear yards are in a lb?
Penny Nom lui répond.
An expression for q quarters and n nickles 2009-01-16
Morgan pose la question :
a variable expression for:

"The value in cents of q quarters and n nickels"

Penny Nom lui répond.
Does probability apply here? 2009-01-15
Paul pose la question :
Suppose I have a dice in my hand that I am about to roll. The probability that I roll a six is, all things being equal, 1/6. I accept that.

Suppose now the I roll the dice and immediately cup my hand over the result. What is the probability that I have rolled a six? People seem to want to say it is still 1/6. But it can't be can it!? It is surely either 1 or 0, depending on whether I have in fact rolled a six?

Robert Dawson lui répond.
A one cubic mile lake 2009-01-09
dye pose la question :
how many liters are in a one cubic mile lake
Robert Dawson lui répond.
660 yards = ?? miles 2009-01-08
Ashley pose la question :
How do I convert yards to miles, specifically, 660 yards = x miles. Please show work so I can figure other problems out.
Penny Nom lui répond.
(a x b) intersect (b x a) 2009-01-08
sean pose la question :
is it possible to have two sets such that n((a X b) intersect (b X a) =3
Harley Weston lui répond.
Numbers or Percentage or probability or what? 2009-01-07
Chew pose la question :
Teacher A teaches 50 students and 45 of them obtained straight As. Teacher B teaches 5 students and 5 of them obtained straight As. Which teacher would you send you child to and why?
Robert Dawson and Harley Weston lui répond.
Converting grams to milliliters 2009-01-04
Faiza pose la question :
I was looking for how to convert grams into mL and I read on this site to convert one to the other you need to know what substance you are measuring. so if I am measuring sugar or any of the baking ingredient like flour how do I convert them from grams to mL is there a simple method I can use to do that?
Penny Nom lui répond.
The square root of 164 2008-12-31
Melissa pose la question :
How do you simplify the square root of 164?
Stephen La Rocque lui répond.
The volume of a feed hopper 2008-12-18
John pose la question :
I need to calculate the volume of a feed hopper, and I'm not sure how to break it down. The top of the hopper is 36" x 36", it is 30" deep, and ends at a 6" x 6" plate. One side of the hopper is straight top to bottom, of course tapering on two sides to meet at the plate. The other three sides angle down at about 75 degrees. I need to determine the cubic foot volume of this hopper (it is used for ground coffee) so I can configure a vibrator to knock down residual grounds. Thanks.
Robert Dawson lui répond.
The angle between two lines 2008-12-17
abhi pose la question :
how to calculate the angle between two lines, given the length of the lines.. angle should vary from 0 - 360 in the counterclockwise direction
Robert Dawson and Harley Weston lui répond.
650g+2kg+195g=how many kg 2008-12-11
christian pose la question :
650g+2kg+195g=how many kg
Penny lui répond.
Wall covering 2008-12-10
Jeanie pose la question :
I need to convert 14 LY of wallcovering (54" wide) to square feet. Can you please help me?
Penny Nom lui répond.
The volume of a pipe 2008-12-10
Walter pose la question :
What is the volume of a pipe 7.92 inches inside diameter and 22 km. long in cubic feet of water
Robert Dawson and Harley Weston lui répond.
A wine decanter 2008-12-10
Suzanne pose la question :
I am trying to buy a wine decanter for my dad for Christmas. One big problem I am having shopping online is finding the right size. Wine is sold by metric ml, with a standard bottle holding 750ml of wine. Decanters are measured by oz, and the sizes are all over the place, with one site alone having sizes 25oz, 26 1/2oz, 50oz, 59 1/8oz, and 68oz.

Can you help me with metric conversions so I can figure out how much wine these decanters hold? Like everybody else, I need this as soon as possible so I can get it shipped in time for Christmas. (I'm disabled & don't drive, so online shopping is my only way to get gifts.)

Thanks for your help!

Suzanne

Chris Fisher and Robert Dawson lui répond.
What is one trillion divided by 10? 2008-12-09
mark pose la question :
can you please tell me what one trillion divided by 10 is
Robert Dawson and Penny Nom lui répond.
The volume of a yogurt pot 2008-12-04
Robyn pose la question :
Okay, I know you have some answers on converting this already, but I can not convert the yoghurt pot I need yet into ml. Is there some way to explain this using the yoghurt as an example? The pot's 150g of lowfat strawberry yoghurt... would the 'low-fat' have an effect on this? I'm sorry if this is a bother for you to answer, I just don't seem to be able to get it... Have a nice day. - Robyn
Janice Cotcher and Penny Nom lui répond.
Division in different bases 2008-12-02
MICHELLE pose la question :
DIVIDE 538 BY 14 IN BASE 2, 3, 4 & 5
Penny lui répond.
3 equidistant points 2008-12-01
Damien pose la question :
How do you find 3 equidistant points (C,D,E) on a line between point A(Xa, Ya) and point B(Xb, Yb) so that AC, CD, DE and EB are all equal?
Chris Fisher lui répond.
What is so important about quadratics? 2008-11-29
zoe pose la question :
what is so important about quadratics?
Harley Weston lui répond.
Dividing Large Numbers 2008-11-26
Mark pose la question :
what is 7.9 trillion divided by 301 million?
Janice Cotcher lui répond.
The path of a small sailboat 2008-11-19
jane pose la question :
a sailor in a small sailboat encounters shifting winds. she sails 2.00 km East then 3.40 km North East, then an additional distance in an unknown direction. Her final position is 6.68 km directly east of the starting point. find the magnitude & direction of the third leg of the voyage.
Harley Weston lui répond.
An algebraic exercise with fractions and radicals 2008-11-18
Rubén pose la question :
Question from Rubén, a teacher:

I have the ecuation:

U = [yb / (ab+a^2)]^1/2 + [ya / (ab+b^2)]^1/2

I know for sure this reduces to

U = [y (1/a + 1/b)]^1/2

but I cannot find a way to get into that result!

Thanks

Rubén Osuna lui répond.
The midpoint o a line segment 2008-11-15
Jane pose la question :
The vertices of a triangle are at (1,7), (6,-1) and (0,3). Find the coordinates of the midpoints of the sides.
Penny Nom lui répond.
A ratio to a decimal 2008-11-14
manny pose la question :
Express 22 : 5 as a decimal. Round to the nearest hundredth
Penny Nom lui répond.
How far are the boats apart? 2008-11-14
dom pose la question :
Two boats leave port at the same time. They leave at 150 degree angle. One boat travels at 10mph and the other at 20mph. After two hours how far are the boats apart?
Penny Nom lui répond.
The angles and sides of a triangle 2008-11-13
JAMIE pose la question :
a triangle with a side(b)37m an angle(C)70degrees and (a)79m find values of angles A and B and length of side c
Stephen La Rocque lui répond.
An odd shaped lot 2008-11-13
Janice pose la question :
Hi I am attaching a survey of an odd shaped real estate lot. I am hoping you can help me determine the acreage.

Janice

Harley Weston lui répond.
How do you work out 2/17 as a decimal? 2008-11-13
p pose la question :
how do you work out 2/17 as a decimal?
Penny Nom lui répond.
A barrel on its side 2008-11-13
Dave pose la question :
Question from Dave:

How many gallons are left in a 36x60 in. barrel (laying on its side) and has 16 in. of gasoline left. I have attached a diagram.

Harley Weston lui répond.
Math and nursing 2008-11-10
alina pose la question :
how many math do you net for nurse
Stephen La Rocque lui répond.
A flagpole and a yardstick 2008-11-07
Wanda pose la question :
One boy holds a yardstick vertically at a point 40 feet from the base of the flagpole. The other boy backs away from the pole to a point where he sights the top of the pole over the top of the yardstick. If his position is 1 ft 9 in from the yardstick and his eye level is 2 ft above the ground, find the height of the flagpole.
Penny Nom lui répond.
A bay window 2008-10-30
Scott pose la question :
Given the length of an arc, the rise of an arc, and the number of segments that I need to divide the arc into - how do I determine the length of each segment? Imagine a bay window. It could have 5 side or 7 sides, just as an example. How do I determine the width of each window given that the unit will be mounted into a frame with a 96 inch opening. The rise of the unit will extend out 18 inches. Lets say that the number of single windows unit within the unit is 5. How wide should each window be? Do you understand?
Harley Weston lui répond.
The length of a rectangle is 6 inches less than 3 times its width. 2008-10-26
Angela pose la question :
The length of a rectangle is 6 inches less than 3 times its width. Find the dimensions of the rectangle if its area is 45 square inches.
Penny Nom lui répond.
Put in lowest terms 6a^2c/8ab 2008-10-24
hana pose la question :
put in lowest terms 6a^2c/8ab
Stephen La Rocque lui répond.
A falling block 2008-10-18
KOBINA pose la question :
A 50 kg block being held at rest 20m above the ground is released. the block falls (no friction). how fast is the block traveling (in m/sec) when it has lost 40% of its original potential energy.
Stephen La Rocque lui répond.
Two equations in two unknowns 2008-10-17
Dushayne pose la question :
Please help me in solving this problem:
a. 3x-4y=32
5x+2y=10

b. 2x+3y=11
4x+3y=10

Penny Nom lui répond.
The dimensions of a rectangle 2008-10-16
cristine pose la question :
the area of a rectangle is 675sq.cm. if the width is 1/3 of the length. find the dimensions of the rectangle....
Penny Nom lui répond.
Millimeters to inches 2008-10-15
diane pose la question :
can you convert milliliters to inches?
Penny Nom lui répond.
The sides of an octagon 2008-10-12
side lengthsGarry pose la question :
I need the length of the sides and the degrees of the angles for a 30 inch diameter octagon
Janice Cotcher lui répond.
The dimensions of a pool 2008-10-08
Justine pose la question :
This may be a really silly question but I am trying to work out what the possible dimension a pool may be if we have 20m length of wall of an above ground pool (laid out flat on ground)

We have been given a second hand above ground pool and we know it was in an oval configuration and we are just trying to get a guesstimate of the potential size it may be as the people couldn't tell us the size

Penny Nom lui répond.
Algebraic fractions 2008-10-06
Kayla pose la question :
(x^2-9)/x times (x^3-4x)/(x^2+5x+6)
Harley Weston lui répond.
A product of positive and negative numbers 2008-10-03
kaylou pose la question :
Suppose you were given 13 numbers and asked to find their product. Seven of the numbers were positive, and the rest were negative. Would your product be positive or negative? Why?
Penny Nom lui répond.
The unusable space in a container 2008-10-02
Billy pose la question :
an object is 42 inches long, 29 inches wide, and 69 inches high. The usable capacity of this container is 36.4 cubic feet. How much space in percentage is left over from the container?
Penny Nom lui répond.
Does an oval have sides? 2008-10-02
reid pose la question :
My 6 yo neice came home with her math homework and she was supposed to identify which objects had sides.One of the objects was an oval.I don't believe it has sides because it is curved and I don't think that would make it an object with sides.What would be the correct answer?Thanks,Reid
Janice Cotcher lui répond.
The length of a tank 2008-10-01
alex pose la question :
I have a tank which I can only partly see. It is 70cms wide, 45 cm deep and hold 500litres. How long is it?
Harley Weston lui répond.
Conversion to cubic feet 2008-10-01
Dorothy pose la question :
What is the cubic feet of an item that is 7"x16 7/8"x19"
Harley Weston lui répond.
z(z+1)-x(x+1) / z-x 2008-09-30
sylvia pose la question :
z(z+1)-x(x+1) / z-x

HOW DO I SIMPLIFY THIS

Penny Nom lui répond.
3,6,10,15,and 21 2008-09-28
jarred pose la question :
i am currently stumped on a math project that requires me to find out the recursive formula for a sequence of numbers. the numbers in the sequence are 3,6,10,15,and 21. Thank you for your time.
Walter Whiteley lui répond.
144 square inches 2008-09-27
mike pose la question :
how much cm is in 144 square inches?
Penny Nom lui répond.
Simplify 6(a+2b)+8a-16b 2008-09-27
madison pose la question :
6(a+2b)+8a-16b
Penny Nom lui répond.
Three equal ratios 2008-09-26
Jodi pose la question :
For the ratio given, find three equal ratios: 2 miles/8 minutes
Penny Nom lui répond.
Sample variance: inches to centimeters 2008-09-22
Anita pose la question :
The average height of a sample of basketball players is 6 feet, 2 inches or 74 inches. The standard deviation of this sample of players is 4 inches. If each person's height were to be multiplied by 2.54, what would be the value of the resulting sample variance?
Harley Weston lui répond.
The sides of an octagon 2008-09-21
mark pose la question :
I need to know the measurements of an octagon with a inside diameter of 34.5 inches from side to side
Penny Nom lui répond.
Simplify [[1/(x+3)]-1/3]/x 2008-09-19
diana pose la question :
How does [[1/(x+3)]-1/3]/x simplify
Harley Weston lui répond.
Oils and fats 2008-09-18
Barry pose la question :
I'm doing a nutrition assignment and I'm adding up my Oils and Fats category. I have 10ml of butter to add to 31g of fat so I'm trying to figure out what to do or I should say how to figure out the answer. Barry
Penny Nom lui répond.
The weight of a concrete cylinder 2008-09-18
Curtis pose la question :
I am trying to calculate the weight of a concrete cylinder. The diameter is 56" and the thickness or depth is 24". Can anyone help me? If possible I would like to see the formula as to how the answer was derived. Thank you
Harley Weston lui répond.
Simplifying equations 2008-09-18
diana pose la question :
I do not know how to simplify equations. How does 5x^2-7X+2 become (x-1) (5x-2)?
Penny Nom lui répond.
Cubic yards and quarts 2008-09-16
Mary pose la question :
I need 2 yards of soil, how many quarts is this?
Penny Nom lui répond.
Three addends that sum to ten 2008-09-13
Alfred pose la question :
How many probabilities are there to have 3 addends to get a sum of 10? What is the formula?
Harley Weston lui répond.
A number that divides by six but not by three 2008-09-12
Ken pose la question :
A number that divides by six but not by three
Stephen La Rocque and Victoria West lui répond.
How would put .12 with 2 repeating into a fraction? 2008-09-09
Savanna pose la question :
How would put .12 with 2 repeating in fraction?

Savanna!

Penny Nom lui répond.
How many ml are in 40 grams? 2008-09-09
Nancy pose la question :
I need to know how many ml are in 40 grams. So what is the base 1ml= how may grams
Harley Weston lui répond.
An exclusion zone around a triangle 2008-09-07
Awrongo pose la question :
A long time ago Mr Gibson found an island shaped as a triangle with three straight shores of length 3 km,4 km and 5 km. He declared an 'exclusion zone' around his island and forbade anyone to come within 1 km of his shore. What was the area of his exclusion zone?
Stephen La Rocque and Penny Nom lui répond.
A security camera 2008-09-07
Rita pose la question :
A security camera in a neighborhhod carnival is mounted on a wall 9 feet above the floor inside a video gallery. What angle of depression should be used if the camera is to be directed to a spot 6 feet above the floor and 12 feet from the wall?
Stephen La Rocque and Harley Weston lui répond.
Simplify ((5/7)/(5/14)) + (3/4) 2008-09-06
Emal pose la question :
How do you simplify completely: ((5/7)/(5/14)) + (3/4)?
Penny Nom lui répond.
3 miles in 6 seconds 2008-09-05
Grant pose la question :
if a rocket sled is traveling 3 miles in 6 seconds, how fast is it going in miles per hour?
Harley Weston lui répond.
The selling price 2008-09-04
Robert pose la question :
Client wants to sell his property providing he is left with 100000.00$ net. How do I calculate selling price if commission is 6% and taxes on the commission 6% Fed and 7.5%prov. I'm taking the real estate class and this one really got me.
Penny Nom lui répond.
I need an equation that best fits these numbers. 2008-09-03
Vallatini, pose la question :
Attached, please find a plotted curve (pdf file). I have pulled values from this curve (see below). I need an equation that best fits these numbers. Can you help?
Harley Weston lui répond.
An algebraic expression 2008-08-29
Antonio pose la question :
write a variable expression for 9 less than k
Penny Nom lui répond.
Long Division with Decimals 2008-08-28
Ghita pose la question :
I need help with these 2 questions: Find the quotients: 52.576 divided by 21 71.331 divided by 93 Ralph spent 5/9 of an hour mixing paints and 7/9 of an hour painting.How much time in all did Ralph spend on his project? Thank you,Please answer soon
Janice Cotcher lui répond.
557 mL of benzaldehyde 2008-08-28
Kara pose la question :
Calculate the mass of 557 mL of benzaldehyde. The density of benzaldehyde is 1.04 g/mL.
Penny Nom lui répond.
The square root of a fraction 2008-08-24
Lauren pose la question :
How do you solve square roots of fractions? Does the format change if it is either a proper or an improper fraction?

Ex. the square root of 1/4 or the square roots of 80/25

Penny Nom lui répond.
Radii and Chords Create a Non-Right Triangle 2008-08-22
Beary pose la question :
AOC is a diameter of circle O. Line AB is 12, and lines OA and OC (the radii) are 10. Find the length of line BO and chord BC.
Janice Cotcher lui répond.
Simplifying Algebraic Expressions 2008-08-22
Jacky pose la question :
x^2-y^2+4x+4y
Penny Nom lui répond.
Converting centimetres to metres 2008-08-21
walter pose la question :
how do you convert the smaller unit to a decimal of the larger unit and then solve 17 m - 130 cm
Penny Nom lui répond.
Angular & Linear Speed from a Sine Graph 2008-08-19
Kim pose la question :
Kim, a student: I am given a graph with a wave. The amplitude is 5cm and the period is 4cm. I am suppose to find the angular speed. What I need to know is the formula for angular speed and how do I use these numbers to get the correct answer.
Janice Cotcher lui répond.
Metres and miles 2008-08-18
Bill pose la question :
I enter a race that is 10,000 meters long,how many miles do i have to run?
Victoria West lui répond.
Solving for Shared Height of Two Right Triangles 2008-08-17
Heidi pose la question :
find the height of a triangle, which can be split into two right triangles, but the base (50m) is not split equally in half. one end of the base is 40 degrees, while the other is 30 degrees.
Janice Cotcher lui répond.
Similar Triangles Given a Median 2008-08-17
RAM pose la question :
Sides AB , AC and median AD of a triangle ABC are respectively proportional to PQ PR and median PM of another triangle PQR. Show that ABC is similar to PQR
Janice Cotcher lui répond.
Converting to cubic yards 2008-08-15
Lisa pose la question :
I need to convert 32,000 square feet, 5 inches deep to cubic yards. Can you help me? Thank you
Harley Weston lui répond.
Similar triangles 2008-08-12
ramarao pose la question :
D is a point on side BC of a triangle ABC such that BD/CD=AB/AC. prove that AD is the bisector AD is the bisector of BAC
Chris Fisher lui répond.
Arc-length and sector-angle 2008-08-06
Benson pose la question :
If chord length, radius are given, How to find the sector angle and arc-length
Janice Cotcher lui répond.
24 in by 14 in by 14 in in cubic feet 2008-08-05
Tom pose la question :
I have a box that has internal dimensions of: 24in. H x 14in. W x 14in. D. How many cubic feet is this internal space?
Penny Nom and Victoria West lui répond.
Why can't you divide by zero? 2008-08-04
Donna pose la question :
Why can't you divide by zero?
Chris Fisher lui répond.
Lot size of a four sided lot 2008-07-30
JAMES pose la question :
I'm trying to find out this lot size in acres. I looked at a bunch of your suggestions, but I guess I'm not smart enough to figure it out.. I have attached an image of the lot, hopefully with enough info. for you..

Thanks,
Jim

Penny Nom lui répond.
Right Sided Limit of an Exponential Function 2008-07-29
joseph pose la question :
I am trying to find the limit as X approaches 0 from the positive side of x to the sin of x which look like this lim x^sinx x->0+
Harley Weston lui répond.
Trigonometric 2008-07-28
kiran pose la question :
In triangle , Sin@ = ?
Penny Nom lui répond.
What is the domain of (f/g)x? 2008-07-28
Warren pose la question :
If f(x)=3x-5 and g(x) = square root of x-5, what is the domain of (f/g)x?
Penny Nom lui répond.
Alpha level 2008-07-23
anonymous pose la question :
What is the advantage of using an alpha level of .01 versus a level of .05, What is the disadvantage of using a smaller alpha level?
Janice Cotcher lui répond.
Simultaneous equations 2008-07-23
Franco pose la question :
Solve

3 D + E - F = -10
-2 D - F = -4
-3 D - 4 E - F = -25

Franco

Penny Nom lui répond.
Choosing 4 numbers from 70 numbers 2008-07-21
Jeannine pose la question :
When using numbers from 1 to 70 in sets of 4, how many combinations are there without having the same combination twice? Thanks
Penny Nom lui répond.
Three consecutive positive integers 2008-07-20
AC pose la question :
find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 4 times the third
Penny Nom lui répond.
A bijection from (0,1)x(0,1) to (0,1) 2008-07-20
Adam pose la question :
I'm trying to prove that the function that takes the open square (0,1)x(0,1) to (0,1) is a bijection (and hence a continuum).

If we take an element (x,y) of (0,1)x(0,1) and represent (x,y) as (0.x1 x2 x3 x4..., 0.y1 y2 y3 y4...) aka x1 represents the tenths digit of x, x2 represents the hundredths, etc. Then we can define a function f((x,y)) = 0.x1 y1 x2 y2 x3 y3... However, this is not a bijection. I hypothesize this is because you'd be unable to create the number 0.1 as x=0.1 and would have to be y=0, which contradicts the open interval (0,1) defined for y. We have been told though, if we create the same function, except that we "group" 9's with their next digit into a "block" we can create a bijection. For example, if x=0.786923 and y=0.699213, then we define x1 to x3 as normal, but x4= 92, and x5=3. For y, we define y1 as normal, but y2=992, and y3 to y4 as normal. hence f((x,y)) = 0.7 6 8 992 6 1 92 3 3.

My questions are a) is my hypothesis on why the original function is not a bijection correct? b) why does the special blocking in the new function make a bijection?

Victoria West lui répond.
A silo with a flat side 2008-07-14
Amy pose la question :
Without using the Pythagorean Theorem, determine the capacity of a silo in cubic feet of grain if: the cylinder-shaped silo has one flat, rectangular face that rests against the side of the barn; the height of the silo is 30 feet and the face resting against the barn is 10 feet wide; the barn is approximately 5 feet from the center of the silo.
Harley Weston lui répond.
A four sided lot 2008-07-09
michelle pose la question :
the front is 65.29
left side 162.26
the back 155.00
right side 101.01

right angle=50.00
left angle= 153.30

Harley Weston lui répond.
Neither prime nor composite 2008-07-08
saloni pose la question :
Give the counting number which is neither prime nor composite ?
Penny Nom lui répond.
Divisibility by 11 2008-07-04
Peter pose la question :
For what single digit value of n is the number n53nn672 divisible by 11?
Leeanne Boehm lui répond.
Composition of two functions 2008-07-04
Kristian pose la question :
f(x)= the square of x add to 1 and g(x)=1/x

find: (f o g)x

Penny Nom lui répond.
Polynomial division and remainders 2008-07-02
RAM pose la question :
If the polynomial x4-6x3+16x2-25x+10 is divided by another polynomial x2-2x+k, the remainder comes out to be x+a. Find k and a.
Janet Cotcher and Harley Weston lui répond.
Kilometers per liters to miles per gallon 2008-06-26
margaret pose la question :
we travelled 130 kilometers on 10 liters of gas. How many miles to the gallon did I get
Penny Nom lui répond.
The smallest number divisible by 1 to 9 2008-06-26
Peggy pose la question :
What is the smallest number divisible by each of the first nine counting numbers?
Penny Nom lui répond.
A six sided lot 2008-06-25
Zack pose la question :
Please help me find the area of my lot. I am sending a fax of the drawing and dimensions. Zack
Harley Weston lui répond.
How many pounds in 300 grams? 2008-06-24
Renelda pose la question :
How many pounds in 300 grams? Can you send the formula? Thanks
Penny Nom lui répond.
The sum of the digits of a number 2008-06-23
Ben pose la question :
Question: Using mathematical induction, prove that if the sum of the digits of a number is divisible by three, then the number itself is also divisible by 3.
Penny Nom lui répond.
9(d+5)=3(d-3)+6d 2008-06-19
davontay pose la question :
9(d+5)=3(d-3)+6d
Harley Weston lui répond.
Concrete blocks 2008-06-18
marvin pose la question :
How many cement blocks do i need to build a 8 ft. tall wall x 1,300 ft. long?
Harley Weston lui répond.
How do you change bases? 2008-06-17
Peter pose la question :
How do you change bases eg. 121 from base 3 to base 5?
Penny Nom lui répond.
-2(x - 1)^2 + 8 2008-06-12
kasondra pose la question :
y=-2(x-1)2[thats a square] +8 that need to be put in standard form
the answer is y= -2x2 -4x + 6
i got y= -2x2 -4x -4
i just don't get how my teacher got that answer

Penny Nom lui répond.
The weight of concrete 2008-06-11
Daniel pose la question :
I need to calculate the weight of Concrete in a slab that measures 2' x 4' x 4" thick. I am pricing out a job and have two different size stones to work with, the second stone measures 2' x 2' x 4".
Harley Weston lui répond.
What are the dimensions of the rectangle? 2008-06-11
Denise pose la question :
A rectangle has a diagonal that is 3.6 feet longer than the length and 7.1 feet longer than the width. What are the dimensions of the rectangle?
Claude Tardif and Victoria West lui répond.
A recursive formula for 9, -18, 36, -27, ... 2008-06-05
Rita pose la question :
I am having trouble understanding how to write formulas (I should say create formulas) from a given sequence. It does not matter what sort of sequence it is. The confusion remains. I have not found a textbook or easy math book that explains this process for the average Joe to grasp. Here are the two questions:

(1) Write a recursive formula for the sequence
9, -18, 36, -72, ...

(2) Write a recursive formula for the sequence
3, 3(sqrt{3}), 9, 9(sqrt{3})

Penny Nom lui répond.
A 4 sided lot 2008-06-03
Pat pose la question :
If a lot of property is: front 127.87, back 156.17, one side is 129.73, the other side is 125.00, then how much total acreage is this.
Harley Weston lui répond.
The area of a regular pentagon 2008-06-02
Jenna pose la question :
I would like to know if there is a formula to find the area of a regular Pentagon that is not inscribed in a circle only apothem and side length are given.
Penny Nom lui répond.
4x^3 - 6x + 2 = 0 2008-05-28
paul pose la question :
4x^3 - 6x + 2 = 0
Janice Cotcher lui répond.
Convert cubic inches to gallons 2008-05-26
Rosemarie pose la question :
How do you convert cubic inches to gallons? Thanks for your help.
Penny Nom lui répond.
.5 cu ft of sand to lbs. 2008-05-25
rogersimmons pose la question :
needtocovert .5 cu ft. of sand into lbs.
Penny Nom lui répond.
3 radical 48 +11 radical 75 2008-05-24
Maria pose la question :
Add 3 radical 48 +11 radical 75. Write answer in simpliest form.
Penny Nom lui répond.
Double the the dimensions of a rectangle 2008-05-22
Destiny pose la question :
Double the the dimensions of a rectangle that is 3 by 4 in. What is the area?
Penny Nom lui répond.
Volume/weight of a salt shedweight 2008-05-21
James pose la question :
How do I find the volume/weight of a salt shed. I have a 3000 ton barn, I need a better way of finding how much salt to order as it gets used. I know how to calculate volume, how do i get tonnage from there??
Harley Weston lui répond.
Nine digit numbers 2008-05-21
Alex pose la question :
List of Nine digit numbers, that can be divided by nine?
Janice Cotcher lui répond.
1+1/1+1/x 2008-05-21
nadean pose la question :
1+1/1+1/x
Penny Nom lui répond.
A weird shaped lot 2008-05-21
James pose la question :
Need to find square foot of a residential lot on a cul-de-sac. Weird triangular shape. Measurements : 126.18 170.08 138.2 48.4
Harley Weston lui répond.
Converting a decimal to a fraction 2008-05-19
judy pose la question :
please explain how to get from the decimal number .3437 to the fraction 11/32
Leeanne Boehm lui répond.
Guy wires for a tower 2008-05-19
larissa pose la question :
a radio tower 500 feet high is located on the side of a hill ( the hill has an inclination to the horizontal of 5 degrees.) How long should two guy wires be if they are connected to the top of the tower and are secured at two points 100 feet directly above ( up the hill ) and directly below the base of the tower?
Penny Nom lui répond.
Fencing around a playground 2008-05-15
Vanessa pose la question :
If the playground is a rectangle with it's width 10ft shorter than it's length, and it can be enclosed by exactly 140ft of fence, what is the length and width of the playground?
Penny Nom lui répond.
The fourth side of a property 2008-05-14
Penny pose la question :
Property has 3 measurements and 2 angles and I want the altitude at a particular point. Corners are sw, nw, ne and se. 1 want the 4th saide measurement confirmed (we think 146.07') and the altitude measurement at 25' from sw (on the sw-se side) The angles provided are interior at nw 67.38 degrees and the opposing corner se interior appears to be 68.58 degrees. the 3 sides with measurements are: sw to nw=54.07'. sw to se 146.07' and se to ne 53.57'. If you would help, we would really appreciate it. Thanks! Penny
Harley Weston lui répond.
How much seed do I need per plot? 2008-05-13
Jaye pose la question :
The plot size is 5 m X 2 m. The seeding rate is 12Kg/ha. How much seed do I need per plot? I have failed to get a proper answer. Thank you.
Penny Nom lui répond.
The weight of a concrete column 2008-05-11
russell pose la question :
a cylindrical form is filled with a slow curing concrete. The base of the form is 10 ft in radius, and height is 25 ft. while the concrete hardens, gravity causes the density to vary from a density of 90 lbs/ft^3 at the bottom to a density of 50 lb/ft^3 at the top. Assume that the density varies linearly from the top to the bottom, and compute the total weight of the resulting concrete column
Harley Weston lui répond.
Selling price 2008-05-10
Roxane pose la question :
I'm trying to figure out the formula for the following, I have a product that I want to receive a certain profit margin, but with this product I also have to pay a percentage of commission to someone. I need to know how to calculate my new selling price taking into account the markup percentage, but I don't want my gross margin to be lowered. I have calculated the markup percentage to get my new selling price with the commission, but it lowers my profit margin once I pay the commission and I don't want it to do that.
Penny Nom lui répond.
The sides of an octagon 2008-05-07
Frank pose la question :
Question from Frank, a parent: Hi, Need to lay out a 10 ft. diameter octagon on the ground. What is the length of the sides ? And the angles ?
Harley Weston lui répond.
Four cookies 2008-05-03
tashera pose la question :
if a serving is 5 cookies. how many servings can i make from 4 cookies?
Stephen La Rocque lui répond.
How many gallons are in 1,500 liters? 2008-05-01
bambi pose la question :
[How many gallons are in 1,500 liters?
Penny Nom lui répond.
Division by zero 2008-05-01
Bill pose la question :
Why does multiplication have a favored status so as to make division by zero undefined?
Harley Weston lui répond.
1/3-5/6=1/x, solve for x 2008-05-01
Lavada pose la question :
1/3-5/6=1/x How do I solve this problem.
Penny Nom lui répond.
(9x^2-4)/(3x^2-5x+2) * (9x^4 - 6x^3 +4x^2)/(27x^4+8x) 2008-04-29
Jonathon pose la question :
I don't remember how to solve an equation in the form of the following:

(9x^2-4)/(3x^2-5x+2) * (9x^4 - 6x^3 +4x^2)/(27x^4+8x) =

Stephen La Rocque lui répond.
Converting metric density 2008-04-28
Hilary pose la question :
10g/100ml=?g/?l
52g/100ml=?g/?l
65g/100ml=?g/?l
100g/100ml=?g/?l
137g/100ml=?g/?l
0.15g/100ml=?g/?l

Penny Nom lui répond.
WHY 144 where does this figure come from 2008-04-19
Sean pose la question :
Why do you use the number 144 to divide

EG. length of timber 2 inches x 8 inches x 14 foot = 1.5 cubic feet

Calculation is 2x8x14 =224 divide by 144 = 1.5 WHY 144 where does this figure come from

Leeanne Boehm lui répond.
Simplify 5x^5/8 / 15x^2/12 2008-04-18
Kyler pose la question :
5x^5/8 / 15x^2/12 Divide the rational expressions. Simplify the results.
Penny Nom lui répond.
The three sides of a triangle 2008-04-16
Bridgett pose la question :
The sum of the lengths of any 2 sides of a triangle must be greater than the third side. If the triangle has one side that is 11 CM, and the second side of the triangle is 4 cm less than twice the third side, what lengths do the 2nd and 3rd side have to be?

between 0000-00-00 and 9999-99-99


Stephen La Rocque lui répond.
What is 300% as a fraction? 2008-04-14
Carli pose la question :
what is 300% as a fraction
Stephen La Rocque lui répond.
A 13 cubic foot cylinder filled with sand 2008-04-12
Thomas pose la question :
I have a 100 pound bag of sand. I need to know how much sand I will need to fill a 13 cubic foot cylinder
Harley Weston lui répond.
The capacity of a silo 2008-04-12
Candonn pose la question :
I have a cement silo that is 30 ft. high and has a diameter of 12 ft. I was wondering what the capacity of the silo is in tons of dry material. The silo is flat on the bottom also.
Penny Nom lui répond.
Some 4 sided polygons 2008-04-11
kathy pose la question :
I am a 4th grade student and need to complete this question:

I need to draw 2 polygons with 4 sides and 2 right angles. Please help. Thanks

Penny Nom lui répond.
Side lengths and angles in a regular octagon 2008-04-09
Lori pose la question :
I am a builder and need to find the length of the sides of an octagon. I know the length between the parallel sides (26 feet). What is the length of each side? What is the angle measurement?
Harley Weston lui répond.
The weight of 1 litre of milk 2008-04-07
IMRAN pose la question :
WHAT WEIGHT IN KILOGRAMS DOES 1 LITRE OF MILK HAVE?
Penny Nom lui répond.
Composition of functions: feet, inches and yards 2008-04-05
Coya pose la question :
write a function f(x) that converts feet to inches.Now write a function g(x) that converts yards to feet. Explain what the composite function f(g(x)) means. Then evaluate f(g(x)) for x = 3,6, and 9.
Stephen La Rocque lui répond.
Compatible numbers 2008-04-04
dawn pose la question :
Need help. Estimate the quotient. Tell what compatible numbers you used.

817divided by 4 =

Penny Nom lui répond.
100 yards of cloth 2008-04-04
Leroy pose la question :
(100 yards of cloth 48 inches = how many square yards)
Penny Nom lui répond.
Ounces and grams 2008-04-02
Rakesh pose la question :
7.2 oz per sq. yard equals ? __ grams per sq. meter

How I can measure the weight of a Jeans fabric (in oz)? And what is the rellation between grams and oz?

Penny Nom lui répond.
Common fraction to decimal fraction 2008-04-01
chadwick pose la question :
how do I turn 3/32 into a decimal
Penny Nom lui répond.
-2 ^ 2 + (6 - 9) / (-3) + 4 * (-2) 2008-04-01
Jeth pose la question :
How do I simplify: -2 ^ 2 + (6 - 9) / (-3) + 4 * (-2)
Penny Nom lui répond.
Square feet and square yards 2008-04-01
Victor pose la question :
6200 sq. ft.into yards
Penny Nom lui répond.
A car tire full of concrete 2008-03-27
robert pose la question :
I want to build a volleyball net support. I am using a car tire 24"odx16"id filled with concrete. how much will this weigh? thanks
Penny Nom lui répond.
Similar triangles 2008-03-26
Nisha pose la question :
In triangle ABC, LM is parallel to AB. If AL=x-3,AC=2x,BM=x-2,BC=2x=3. Find x
Penny Nom lui répond.
Light years to miles 2008-03-24
Robert pose la question :
HOW MANY MILES ARE THERE IN 7.5 BILLION LIGHT YEARS.
Penny Nom lui répond.
Converting ounces to milliliters 2008-03-21
kelly pose la question :
As I have to drink 12 - 8 ounce glasses of water a day and my water bottle holds 591 ml, how many bottles of water must I drink?
Penny Nom lui répond.
How would I graph: x - 2 divided by x^2 - 4? 2008-03-19
Sean pose la question :
How would I graph: x - 2 divided by x^2 - 4 using a method in extreme values of functions or completing the square

x - 2/ x^2-4

Stephen La Rocque lui répond.
Determine the capacity of Farmer John's silo 2008-03-16
paula pose la question :
Farmer John stores grain in a large silo located at the edge of his farm. The cylinder-shaped silo has one flat, rectangular face that rests against the side of his barn. The height of the silo is 30 feet and the face resting against the barn is 10 feet wide. If the barn is approximately 5 feet from the center of the silo, determine the capacity of Farmer John’s silo in cubic feet of grain.
Penny Nom lui répond.
The limit of (sin4x)/(tan9x) as x approaches zero 2008-03-14
stev pose la question :
as x->0. How do you find the limit of f(x)=(sin4x)/(tan9X)
Harley Weston lui répond.
The length of a side of a square 2008-03-12
laura pose la question :
if i had a square of 2.3 square meters what would its radius be?(in centimeters please)
Penny Nom lui répond.
Moving grain across the river 2008-03-12
Janice pose la question :
Wesley needs to move 820 kg of grain across the river in a canoe that can carry no more than 120 kg. Wesley has a mass of 70 kg. What is the fewest number of trips he will have to make? A. 17 trips; B. 18 trips; C. 32 trips; D. 33 trips.
Penny Nom lui répond.
A ton of carbon dioxide 2008-03-11
claire pose la question :
I want to know the size of a box if it contained a ton of Co2?
Stephen La Rocque lui répond.
Repeating decimals 2008-03-10
Blaine pose la question :
Is it possible to put a repeating decimal number into a calculator to solve a problem?

EX: Write 39.3939... as a fraction.

Penny Nom lui répond.
Side lengths and area of a triangle 2008-03-08
angela pose la question :
In the diagram of ABC the angle A is 65 the angle B is 70 and the side opposite vertex B is 7. Find the length of the side opposite vertex A and find the area of ABC
Penny Nom lui répond.
Composition of functions 2008-03-07
sharon pose la question :
Find FoG(x)
F(x)= the square root of x-9
G(x)= x^2
and also find GoF and their domains

Penny Nom lui répond.
Cubic feet to liters 2008-03-06
chase pose la question :
if 1cu.ft=6.229 imp. gal and1 imp.gal=4.546 liters how many liters does of 128cuft. hold
Penny Nom lui répond.
The dimensions of a rectangle 2008-03-06
Julie pose la question :
Find the dimensions of a rectangle with an area of 400. Width x ft. Length (2x-7)ft.
Stephen La Rocque and Penny Nom lui répond.
An arithmetic expression 2008-03-05
Kasani pose la question :
evaluate the expression: -2^-1[-14 - 4(-6)] - (7 - 3)
Penny Nom lui répond.
How large is a container that will hold 3.5 cu meters? 2008-03-05
Robert pose la question :
If a company allows you to ship personal belongings while on an over seas assignment and the figure is 3.5 cubic meters. Just how much is the total area in square feet?? 10X10X10 or??? I just wanted to understand the size of a container that would hold 3.5 cubic meters!!
Harley Weston lui répond.
What was the ostrich's speed in miles per hour? 2008-03-03
jacob pose la question :
If it took an ostrich 2.5 seconds to travel 110 feet and the average speed is 44 feet/ seconds, what was the ostrich's speed in miles per hour?
Penny Nom lui répond.
Convert from base 6 to base 12 2008-03-02
Jade pose la question :
I am trying to convert 13405 base 6 to a base 12 number. I am not allowed to go into a base 10 number. How will can I base 12 without doing anything with base 10? Thank you kindly.
Stephen La Rocque and Penny Nom lui répond.
Simultaneous equations 2008-02-29
CONOR pose la question :
I was wondering if you could help me with this problem

7x - 5y = -1
3y = 4x

Penny Nom lui répond.
150 decimeters is how many centimeters 2008-02-29
gayle pose la question :
150 decimeters is how many centimeters
Penny Nom lui répond.
A new carpet 2008-02-28
Rhiannon pose la question :
The Gatlins are buying a new carpet for their house. They need about 1,175 square feet of carpet. The carpet they buy is sold by the square yard. Estimate the number of square yards of carpet they need. Do I use the formula to find the volume or are?
Penny Nom lui répond.
Actural cost, selling price and commission 2008-02-21
LiSa pose la question :
I have a question about a few things if anyone can answer... ex. actual cost (AC) = $1000 selling price (SP) = $ amount earned for company (C) = 15% of... selling price? commission 1 (C1) = 2.5% commission 2 (C2) = 2.5% How would you calculate how much the company's commission amount would be as well as the amounts for the other 2 that get 2.5%? And what would the selling price be? (the 15% $ + 2.5% $ + 2.5% $ ?) Is the 2.5% taken from the original amount? I am soooo confused! If anyone could help, that would be great!
Harley Weston lui répond.
Algebraic fractions 2008-02-21
sergio pose la question :
how to simplify
(x^2 +5x+6)/(x^2 - 4) x (x^2 -5x+6)/(x^2-9)

Stephen La Rocque lui répond.
8% simple interest for 6 years 2008-02-20
Tiffany pose la question :
cindy puts 5,025 in a bank account that earns a simple interest rate of 8%. How much money will be in the account at the end of 6 years?
Stephen La Rocque and Penny Nom lui répond.
The length of the third side of a triangle 2008-02-16
mary pose la question :
I have an angle of 72 degrees and each of the sides are 5' long. What is the distance from each of the ends of the 5 feet to form a triangle.
Stephen La Rocque lui répond.
I am a 4-digit number 2008-02-12
Nickie pose la question :
I am a 4-digit number with no repeating digits. I am divisible by 5, my first two digits (left to right) make a number divisible by 3, and my first three digits make a number divisible by 4. Also, my digits have a sum of 19 and I have the digit 7 in the thousands place. Who am I?
Penny Nom lui répond.
Drawing blocks from a box 2008-02-11
Inez pose la question :
A box contains 3 red blocks and 1 green block. A block is chosen without looking and not put back. Then another block is chosen. What are the possible outcomes?
Penny Nom lui répond.
A flagpole and a statue 2008-02-09
Krista pose la question :
A flagpole casts a ten meter (m) shadow at the same time as a six metre (m) statute beside it casts a two metre shadow. What is the height of the flagpole??
Steve La Rocque and Penny Nom lui répond.
A three sided shape 2008-02-09
Tim pose la question :
Question from Tim:

How would I calculate the area in square feet of a "triangle" with sides:

Base is 36 feet; height is 70 feet; and the thirs side is an arch (curve) of 77 feet.

Harley Weston lui répond.
Why is the number 1 neither prime nor composite? 2008-02-07
ronni pose la question :
why is the number 1 neither prime nor composite?
Harley Weston lui répond.
Cost per square yard 2008-02-05
Terry pose la question :
MY cost for seed is $325.00 per acre...i want to bring that down to $ per sqyard. Whats the formula?
Penny Nom lui répond.
The size of a lot 2008-02-02
linda pose la question :
Hi, could you please tell me how close to an acre of land my lot is. The lot size is 140 ft by 200ft. I am trying to see how close to an acre it is.
Penny Nom lui répond.
The dimensions of a rectangle 2008-02-01
Evan pose la question :
you are given that the area of a rectangle is 21.6in sq. find the base and the height of the rectangle.
Penny Nom lui répond.
The sign of the quotient of two integers 2008-02-01
michelle pose la question :
without actually dividing, how can you decide whether the quotient of two integers is A. positive B. negative C. 0?
Penny Nom lui répond.
Bubbles trapped in the volumetric pipet 2008-01-31
Nursing pose la question :
In determining the density of a liquid, a student left air bubbles trapped in the volumetric pipet. Did this give a density less than expected or greater than expected? Why?
Penny Nom lui répond.
The volume of a tank 2008-01-27
Fred pose la question :
A cubic tank holds 1,000 kilograms of water what are the dimensions of the tank in meters?
Harley Weston lui répond.
Linear feet to metres 2008-01-25
Jillian pose la question :
i have a measurement of something in linear feet. i dont know what a linear foot is so i want to convert it to meters to have an idea. how do i convert.
Penny Nom lui répond.
Converting cubic inches to ounces 2008-01-22
kim pose la question :
I am trying to find the formula to figure capacity in ounces for the following:

a rectangle 18" long, .75" wide, .75" deep ....

This is for an art project and the cost estimate. Thanks, Kim

Penny Nom lui répond.
How many combinations of 8614 are divisible by 7? 2008-01-22
Rebecca pose la question :
How many combinations of 8614 are divisible by 7 equally (with no remainder)?
Penny Nom lui répond.
The cosine of an angle 2008-01-21
Kristine pose la question :
Find measure of unknown side cosA=0.5
Harley Weston lui répond.
The angles of a triangle given the three sides 2008-01-17
Lucy pose la question :
Is there a way to find the angles of a triangle just by knowing the lengths of it's sides? It seems like the would be a relationship between the two, but I'm not sure.
Stephen La Rocque and Harley Weston lui répond.
Converting mg's to cc's 2008-01-17
sandy pose la question :
i need to find out how to convert mg's to cc's i need to give 10 mg of liquid and 5 mg of liquid and i only have a dropper that measures cc's please help
Stephen La Rocque and Harley Weston lui répond.
Fact families with multiplication and division 2008-01-16
Donna pose la question :
I am trying to help my granddaughter with some math homework. I looked at what you have on fact families. Am I correct to assume that the same process applies to multiplication and division as well? Her question asks for fact families for 2, 8, & 16.
Penny Nom lui répond.
Explaining the factoring for the difference of cubes 2008-01-16
Bill pose la question :
A student asked me where did the "difference of cubes" and "sum of cubes" come from. I did not have an answer for her. She is very bright and understands how they work but wanted to know where they derived from. Any help you can offer would be great. Thanks
Stephen La Rocque lui répond.
A 16 sided lot 2008-01-16
R pose la question :
I am having a land of 16 irregular sides i know all the length of the sides how to calculate the area of the land
Harley Weston lui répond.
Balancing on a fulcrum (net torque and equilbrium) 2008-01-15
Eric pose la question :
If I have a 4" bar that has no weight value with a 275lb. weight on one side and a 125lb. weight on the other side what would be the folcrum point? Please keep the answer very simple. Also is there a fixed equation to figure folcrum points? Is there an equation for if the 4" bar had a weight value?
Stephen La Rocque lui répond.
Two solutions using the law of sines 2008-01-14
Kate pose la question :
I am working on the Law of Sines and I have a problem that says: Find a value for b so that the triangle has 2 solutions.

I am given that A = 36 degrees and a = 5. Now, I learned that for a triangle to have 2 solutions, h < a < b. BUT...my answer key says the answer is: 5 < b < 5/sin 36. I can't figure out how to make this fit with h < a < b.

Harley Weston lui répond.
(303,000,000,000,303x3,300,000,033)/1,000,100,010,001 2008-01-13
Adrian pose la question :
Give the result of the following computation as an integer.

(303,000,000,000,303x3,300,000,033)/1,000,100,010,001

N.B. No calculators allowed

Penny Nom lui répond.
Forces on an inclined plane 2008-01-10
Ron pose la question :
A body that weighs 540lbs is caused to slide up an inclined plane with a uniform velocity by a force that acts parallel to the plane. For each foot of horizontal distance, there is a vertical rise of 2in. If the coefficient of sliding friction is 0.16, what force is required to move the body?
Stephen La Rocque lui répond.
Base salary plus commission 2008-01-10
mike pose la question :
i need some help with this word problem. in november 2001, hall kinion advertised an account executive position in savannah georgia for a salesperson with experience selling internet services. the job advertised a 3500 dollar base salary and 24000 dollar to 48000 dollar in commissions in the first year. Assuming a 20 percent commission rate, how many dollars in sales would u have to generate to earn 64000 dollars annually.
Penny Nom lui répond.
Sqrt(x^2 + y^2) 2008-01-10
Darcie pose la question :
Can you simplify this problem?: square root of (x squared plus y squared). Note: x squared plus y squared is under the radical.
Penny Nom lui répond.
Conversion 2008-01-08
Dom pose la question :
Hi , Is it possible to convert 175 grams per metered squared to cm ? tks Dom
Stephen La Rocque lui répond.
How far is the jet from the lighthouse? 2008-01-07
Natalie pose la question :
Question: A ship spots a lighthouse that is 53m high, at an angle of elevation of 7 degrees that is directly north of the ship. The same ship spots a jet travelling N62E at an altitude of 1500m with an angle of elevation of 15 degrees. How far is the jet from the lighthouse?

Natalie

Harley Weston lui répond.
Sigma notation 2008-01-06
jamelia pose la question :
what is this word problem in sigma style i am so lost at this point my first time ever attempting this subject 1+2+3+4+5
Penny Nom lui répond.
Lining up coins visually using geometry and trigonometry 2007-12-31
Jessica pose la question :
a) In what order would you arrange a penny, a nickel, a dime, a quarter, and a half-dollar so that they all have the same apparent size? The diameters of the coins, in thousandths of inches, are as follows: penny, 750; nickel, 835; dime, 705; quarter, 955; half-dollar, 1205.
b) How should the coins be placed, if the distance between the dime and the half-dollar is 100 units? How far from thw dime should your eye be to see that all the coins have the same apparent size?
c) What angle do the coins subtend when they have the same apparent size?

Stephen La Rocque lui répond.
Smallest cone containing a 4cm radius inscribed sphere 2007-12-19
Eva pose la question :
A sphere with a radius of 4cm is inscribed into a cone. Find the minimum volume of the cone.
Stephen La Rocque lui répond.
Simplifying square roots 2007-12-19
Ciara pose la question :
How would you calculate 2 to the square root of 8 plus 4 to the square root of 2 minus 5 to the square root of 2?
Stephen La Rocque lui répond.
What size room would I need for 220 cubic feet? 2007-12-18
Andy pose la question :
What size room would I need for 220 cubic feet? What is the calculation I would use to find the answer to this problem?
Penny Nom lui répond.
System of equations 2007-12-06
Jenn pose la question :
change the equation,x-y=4 to form y=mx+b the solution to the system of equations y=2x and y=-x+3 is
Stephen La Rocque lui répond.
Chicken and goat feet 2007-12-05
Kim pose la question :
Old McDonald raises goats and chickens. The animals have a total of 100 heads adn 360 feet. How many goats and how many chickens does Mr. McDonald have?
Stephen La Rocque and Penny Nom lui répond.
Third side of a triangle 2007-12-05
Sudhir pose la question :
How can we find the all positive integral values for the third side of a triangle, whose other two sides measure 15 and 20 respectively. (No other information viz. the type of triangle, area, perimeter or angles etc. is given.)
Stephen La Rocque lui répond.
A decision based on data 2007-12-04
manny pose la question :
You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items. The higher the manual dexterity of a worker the less likelihood that worker will break significant inventory. Because of a unique contract you must hire all 10 employees from one of the two groups and none of the employees from the other.

You must decide which group to choose. Choose at least two measures of central tendency and at least one measure of dispersion for each group and use those to make your choice. Be sure to justify your choice with at least one page of discussion and analysis.

Penny Nom lui répond.
Ramp height 2007-12-03
Steve pose la question :
I need to find the height of a angle. 23 degree angle at 12 feet of length is how high from the ground?
Stephen La Rocque lui répond.
Converting grams of hair spray into milliliters 2007-12-02
komal pose la question :
I am confused that i am converting 75grams of hair spray ( liquid) into ML? but i couldnt get the answer what is perfect answer for that please help me for this thing.
Penny Nom lui répond.
The dimensions of a box 2007-11-30
nephi pose la question :
if i wanted to make a box that was 0.35 ~ 0.7 Cubic Feet on the inside how would i go about making the measurements for the outside?
Penny Nom lui répond.
Transformations and compositions 2007-11-29
mary pose la question :
Is there any possible relationship between composite functions and the concept of function transformations?
Harley Weston lui répond.
Density 2007-11-29
jessuca pose la question :
what is the density for 40g / 2 mL
Penny Nom lui répond.
The width of a property 2007-11-29
Angie pose la question :
I need to know what the footage is to find 8.1 acres knowing that the North boundary is 1309'
Penny Nom lui répond.
The perimeter of Wisconsin 2007-11-26
Kyle pose la question :
I am doing a project and I need to figure out the total perimeter of wisconsin in miles and only know the square miles of Wisconsin which is 65,503 and I need to get that to miles I have no clue how to do this. I've looked all of the computer for answers but got none. Thanks
Leeanne Boehm and Penny Nom lui répond.
A curve sketch 2007-11-22
Ahson pose la question :
Find critical points, determine the monotonicity and concavity and sketch a graph of f(x) with any local maximum, local minimum and inflection points labeled:

1. f(x) = x^4 - x^3 - 3x^2 + 1

Harley Weston lui répond.
The definition of the sine function 2007-11-22
Indrajit pose la question :
I need a explanation in this theory.......if sinθ = p/h...then
sin 90 deg. = p/h
or 1 = p/h
or p=h .....how can a perpendicular be equal to a hypotenuse.???

Harley Weston lui répond.
Area of a 17-sided lot 2007-11-21
Lynda pose la question :
My uncle is wanting to buy this piece of land [a 17-sided polygon] but we are questioning the acerage total. the measurements are [on the attached diagram].
Stephen La Rocque lui répond.
I know it's heavy, but how heavy, per linear foot? 2007-11-19
Gary pose la question :
I am trying to find out the weight of a linear foot of a steel bar with the following measurements.
Thickness - 1.125"
Length - 120"
Height - 18"

Density of carbon steel - .2837
I know it's heavy, but how heavy, per linear foot?

Stephen La Rocque lui répond.
Cubic feet and gallons 2007-11-19
Leonard pose la question :
Every conversion I find to convert a cubic foot to a gallon is in liquid. Question, how would 1 cubic foot convert to gallons in dry measurement? Example say you have 1 Gallon of packing peanuts how many cubic feet would that be? I can do this and have done it for the heck of it, I took a box 12x12x12 inches, which is a cubic foot, filled it with packing peanuts the tried to fill a 1 Gallon container, that amount almost fills a 1 gallon bucket twice. I even ask a math teacher and was told that 1 cubic foot equaled 7.481 gallons, then I said that is liquid, teacher ansered yes, then i ask what about dry and got a response of I do not know.
Harley Weston lui répond.
Sides and vertices 2007-11-17
derek pose la question :
What is the correct name for a 2D geometric shape that would look like one slice from a round pizza and how may sides and vertices would it have? I believe you would say it has one vertex and two sides with the curved boundary not resulting in vertices or a side. Your help is much appreciated.
Chris Fisher and Walter Whitelty lui répond.
How many centimeters equal one meter? 2007-11-15
Sherrie pose la question :
How many centimeters equal one meter?
Penny Nom lui répond.
The third side of a triange 2007-11-12
Christine pose la question :
I need the inequality to describe the third side of a triange if two sides are known. First side is 23 and second side is 15. What is the third side?
Stephen La Rocque and Victoria West lui répond.
A mole of hydrogen peroxide 2007-11-11
John pose la question :
i need to get a mole of hydrogen peroxide, which i know is 34g, but i don't have a way to measure grams, so do you know how many mililiters i need to have 34g of hydrogen peroxide. Thanks for all the help
Stephen La Rocque lui répond.
How do i convert milliliters to grams for water and also for copper sulfate (CuSO4)? 2007-11-11
jenn pose la question :
how do i convert milliliters to grams for water and also for copper sulfate (CuSO4)?
Harley Weston lui répond.
KWH and MWH 2007-11-10
Julie pose la question :
Please provide the conversion of MWH to KWH or vice-versa. thanks
Penny Nom lui répond.
Cubic centimeters to cubic yards 2007-11-10
Logan pose la question :
if i have 188.4cm^3 of concrete how do i change it into cubic yards?
Penny Nom lui répond.
Related Rates (streetlamp and shadow) 2007-11-09
Casey pose la question :
A street light is mounted at the top of a 15ft pole. A man 6ft tall walks away from the pole at a rate of 5ft per second. How fast is the tip of his shadow moving when he is 40ft from the pole?
Stephen La Rocque and Penny Nom lui répond.
Increasing and decreasing for functions 2007-11-09
David pose la question :
Direction: Identify the open intervals on which the function is increasing or decreasing.

f(x)=1/(x^2)
f'(x)= -2/(x^3)

i understand how to get up until there, and the undf. is x=0, but now i'm having problem setting up the number table chart. i cant remember how, and where to place the increase and decrease + - the chart, for example <---------0----------> where would the increase and the decrease be place?

Harley Weston lui répond.
Meters per second to miles per hour 2007-11-08
Niecey pose la question :
If Greg was timed at 0.91 seconds for 10 meters running the 100 meter dash, at that speed, could he pass a car traveling 15 miles per hour in a school zone?
Penny Nom lui répond.
Why is the number 1 neither prime nor composite? 2007-11-08
amarilis pose la question :
why is the number 1 neither prime nor composite?
Penny Nom lui répond.
Changing units and sizes of things 2007-11-08
Carol pose la question :
volume of cube = 216 cubic inches how do I calculate cubic feet and calculate its surface area in square feet. a rectangular box has dimensions of 3 x 6 x 15 how do I calculate surface area in square yards and calculate volume in cubic inches. if I double the dimensions how does it affect the volume
Stephen La Rocque lui répond.
Simple interest 2007-11-08
Lee pose la question :
If a bank pays 3% simple interest anually on savings, and you did not take any money out of your account, how much money would you have deposited to earn $45 in interest
Stephen La Rocque lui répond.
Two triangles 2007-11-08
Barbara pose la question :
If the base of a larger triangle is 34 inches long, what is the length of side A of the smaller triangle?

(the small triangle has on top the letter a on the right side of the triangle it has the letter b, and at the bottom of the small triangle it has the number 17)

Penny Nom lui répond.
I have a piece of material 44 inches by 78 inches 2007-11-02
Marianne pose la question :
I have a piece of material 44 inches by 78 inches. How many linear yards can I get from it?
Penny Nom lui répond.
A decimal to a fraction 2007-11-01
Lisa pose la question :
i am trying to turn a decimal into a fraction. my example is to turn 10.5 into a fraction at its lowest form
Penny Nom lui répond.
A wiffleball field 2007-10-31
Svitlana pose la question :
The Adam's family has set up a wiffleball field in their backyard. The bases are arranged like a typical baseball diamond, where the distance between consecutive bases is the same. First base is opposite of third base, and second base is opposite of home plate. The distance between consecutive bases is 50 feet. Now, the pitcher stands 25 feet from home plate and lies on the line between home plate and second base. How far is the pitcher from first base? Round your answer down to the nearest inch.
Penny Nom lui répond.
Density 2007-10-30
Ali pose la question :
Would an object sink or float in pure water if it has a mass of 10g and a volume of 5 cubic centimeters? 314
Stephen La Rocque lui répond.
Constantly accelerated motion 2007-10-29
Priyanka pose la question :
A, B and C are three points lying in that order on a straight line. A body is projected from B towards A with speed 3 m/s. The body experiences an acceleration of 1 m/s^2 towards C. If BC =20 m, find the time taken to reach C and the distance travelled by the body from the moment of projection until it reaches C.
Stephen La Rocque lui répond.
Converting millimeteres to inches 2007-10-27
Alison pose la question :
I am hoping to buy a cabinet, the measurements are 1120mm x 560mm, what is that in feet & inches.
Penny Nom lui répond.
The length of a rectangle is twice the width 2007-10-26
Tami pose la question :
The length of a rectangle is twice the width. The number of square units in it's arear is four times the number of units in it's perimeter. What are the dimensions of the rectangle?
Penny Nom lui répond.
A sixfold increase 2007-10-24
Fred pose la question :
If I have $500 and it grew to $3,000, what is the correct description of the increase? Is it a sixfold increase (sextupled), or a fivefold increase (quintupled)? When I divide $3,000 by $500, the result is six, therefore, a sixfold increase?
Stephen La Rocque lui répond.
Converting bases 2007-10-24
Johanna pose la question :
Is there an easy way to convert from base to base. For example, base 5 to base 9 or base 2 to base 4 etc
Stephen La Rocque and Penny Nom lui répond.
The nth term 2007-10-18
shannon pose la question :
Ok , what i am having problems with is the nth term. I get how the numbers come together, but i am having trouble with finding the nth term.
Penny Nom lui répond.
Convert 13.5 oz per sq yard of fabric into grams per meter square 2007-10-17
marcy pose la question :
I need to convert 13.5 oz per sq yard of fabric into grams per meter square.
Penny Nom lui répond.
Paying with silver - Part 2 2007-10-17
Shanna pose la question :
The paying with silver problem. I understand how to do the problem, but could you please explain how you would use base 2 arithmetic to solve it.
Penny Nom lui répond.
Calculate the dimensions of the rectangle 2007-10-16
Sara pose la question :
The perimeter of a rectangle is 62cm. The length of the diagonal is 25 cm. Calculate the dimensions of the rectangle.
Stephen La Rocque lui répond.
Surface area of an open-ended cone 2007-10-16
Lorne pose la question :
What is the surface area of an open ended cone? Measured at 10' high, 16' diameter on the bottom and 2' diameter at the top.
Stephen La Rocque lui répond.
How many tons of asphalt are in 12 cubic yards? 2007-10-15
Matthew pose la question :
I want to know how many tons of asphalt are in 12 cubic yards?
Penny Nom lui répond.
Four triangles in a square 2007-10-15
Kristina pose la question :
A square with side lengths of 6 cm is divided into 3 right triangles and a larger isosceles triangle. If the three right triangles have equal area, find the exact area of the isosceles triangle.
Stephen La Rocque lui répond.
The dimensions of a rectangle 2007-10-14
Elizabeth pose la question :
The perimeter of a rectangle is 20m. The area is 20sqm. Calculate the dimensions of the rectangle. Give your answers correct to two decimal places.
Penny Nom lui répond.
Substitution method 2007-10-11
Kevin pose la question :
3xx+2y=-36-y=11
Stephen La Rocque lui répond.
Area of a quadrilateral 2007-10-10
Courtney pose la question :
how would i find the area of a quadrilateral..
the sides are a (/) is 6cm, b (—) is 9 cm, and c (\) is 7 cm..
the angle between a and b is 140 degrees and b and c is 115 degrees..

Stephen La Rocque lui répond.
Parabolic suspension bridge 2007-10-09
Jessica pose la question :
A suspesion bridge with weight uniformly distributed along its length has twin towers that extend 75 meters abouve the road surfce and are 400 meters apart.The cables are parabolic in shape and are suspended from the tops of the towers. The cables touch the road surface at the center of the bridge. Find the height of the cables at a point 100 meters from the center. (Assume that the road is level.)
Stephen La Rocque lui répond.
Simplifying algebraic expressions 2007-10-09
Sakeena pose la question :
(2^2*3)^x+1/2^2x*3x
Stephen La Rocque lui répond.
Simplifying rational expressions 2007-10-09
Bama pose la question :
x(x-2)+1 divided by x^2-3x+2
Stephen La Rocque lui répond.
Subtracting rational expressions 2007-10-09
Pamela pose la question :
Subtract:
6p – w     __     4c + p
 w – 4             w – 4

Stephen La Rocque lui répond.
Area and side length of a hexagonal tent 2007-10-09
Mark pose la question :
Trying to buy a tent with 6 sides, in the catalog they give me sq. ft., what is the distance from side to side of a hexagonal tent with an area of 90 sq. ft.
Stephen La Rocque lui répond.
Coin jar 2007-10-07
a student pose la question :
Sally empties his jar of coins. It contains $3.75 in nickels, dimes, and quarters. The number of dimes is twice the number of nickels and the number of quarters is three less than the number of nickels. Determine how many nickels, dimes, and quarters were in the in the jar.
Stephen La Rocque lui répond.
Solving four simultaneous equations (system of four linear equations) 2007-10-07
Johan pose la question :
I need some help in solving this question
x + 2y - 3z + 4w = 12
2x + 2y - 2z + 3w = 10
0 + y + z + 0 = -1
x - y + z - 2w = -4

Stephen La Rocque lui répond.
Motion along a line 2007-10-02
Claudette pose la question :
If the position function of a particle is x(t) = sin^2(2t), find the distance that the particle travels from t = 0 to t = 2
Harley Weston lui répond.
3 times x to the power -2 2007-10-01
Jennifer pose la question :
The problem is 3 times x to the power -2.

I was just supposed to simplify, and I have no idea how.

Penny Nom lui répond.
I have a 6 digits 2007-09-28
Kim pose la question :
I have a 6 digits. My hundred-thousands digit is 1 less that my ones digit, 8 more than my thousands digit, twice my tens digit, and 4 times my hundreds digit. My ten-thousands digit is 0. What number am I?
Stephen La Rocque lui répond.
Nine dots 2007-09-25
al pose la question :
Connect the dots.
There is nine dots, three across and three down.
Connect the nine dot with the pencil only using four line and never lifting the pencil off of the paper.

Stephen La Rocque and Harley Weston lui répond.
Exponential regression 2007-09-24
Anonymous pose la question :
I need help in finding this. Find a formula for exponential regression. Determine how to calculate a and b in the formula. Y = ba^x where y is as a function of x.
Penny Nom lui répond.
A 3 ounce piece of gold 2007-09-24
Helen pose la question :
What would the volume (in mL) of a 3 ounce piece of gold be?
16oz= 1lb
1lb= 454oz.
first i converted 3oz to lbs and then to grams to get the mass. i got 85.125 g. now i don't know how to get the density to get to the volume.

Stephen La Rocque lui répond.
Finding equations, intersection point of two lines at right angles 2007-09-22
Yaz pose la question :
Find the equation of the line joining A(-1,-9) to B(6,120). Another line passes through C(7,-5) and meets AB at rigth angle of D. Find the euation of CD and calculate the co-ordinates of D.
Stephen La Rocque lui répond.
Metres per minute to miles per hour 2007-09-20
Angela pose la question :
If a person is traveling 150 meters per minute, what is their speed in miles per hour?
Stephen La Rocque and Harley Weston lui répond.
(5C squared + 14C + 11) divided by (5C + 4) 2007-09-20
John pose la question :
(5C squared + 14C + 11) divided by (5C + 4)
Harley Weston lui répond.
Area of an irregular lot 2007-09-20
Joanne pose la question :
I found your web site through ask.com & it's great. Really hoping you can help me. We are looking at purchasing an existing home with a lot size that is advertised at 2.04 acres, however, even with my limited math skills I know this is not correct.

Their calculation takes the deepest part of the lost (179 feet) multiplied by the widest part of the lost (497.26 feet) as if it was a perfect rectangle. As you can see from the faxed diagram it is far from rectangular in shape.

Can you advise as to the true lot size? As I mentioned we are looking at this property as a purchase so time is of the essence. I have also faxed this information (with the diagram) to the number listed on your web site. Thank you so much for your help.

Harley Weston lui répond.
how do you simplify 3a + 13b = 37 2007-09-16
brandon pose la question :
how do you simplify 3a + 13b = 37
Penny Nom lui répond.
Volume, mass and density 2007-09-14
Nathan pose la question :
I have a sample of material that is 10cmx10cmx5cm and has a mass of 29 grams. How many grams would a sample of the same material that was 96cmx188cmx5cm be?
Penny Nom lui répond.
How much stone will be needed to fill the trench? 2007-09-14
Debbie pose la question :
A trench 100metres long 1ft wide*18inches deep with a 4inch pipe laid. How much stone will be needed to fill the trench.
How much weight in stone would I need to fill it?

Penny Nom and Victoria West lui répond.
Is it platinum or silver? 2007-09-14
Jordan pose la question :
In Chemistry we are doing a lot of problems that are much more math related than anything. One of my questions reads: A certain medallion has a mass of 55.64 g. When placed in 75.2 mL of water in a graduated cylinder, the water level rises and then reads 77.8 mL. Is the medallion made of platinum (D=21.4 g/mL) or silver (D= 10.5 g/mL)?
Penny Nom lui répond.
The contents of a silo 2007-09-14
Steven pose la question :
I need to know how to find the weight of the contents of a silo that is 4 feet across and is funnel shaped at 60 degrees
Penny Nom lui répond.
Composite angles 2007-09-13
Gilbert pose la question :
what is a composite angle? please help
Stephen La Rocque lui répond.
What was the water level in the cylinder? 2007-09-11
glen pose la question :
After a 5.63-g sample of Wood's metal has been added to the water in a 10-mL graduated cylinder, the new water level is 8.7mL. What was the water level in the cylinder before the sample was added?
Stephen la Rocque lui répond.
Markup to include 6% commission 2007-09-07
Steve pose la question :
I estimate the cost to build a house for $250,000.00. I mark it up by 20%: $250,000 x 1.20 = $300,000 base price (BP) without sales commission. I want to set the sale price (SP) to include a 6% commission to pay the real estate fee. After the 6 % fee is paid I want to net the $300,000 base price. The formula is basically: $300,000 + 6% of SP = SP. But I can't figure out how to solve for SP.
Penny Nom lui répond.
2x+1+x-4+4x+1 2007-09-06
laurie pose la question :
2x+1+x-4+4x+1
Penny Nom lui répond.
How many two digit numbers contain at least one 7? 2007-09-06
Janet pose la question :
How many two digit numbers contain at least one number seven?
Penny Nom lui répond.
Variable expressions - part 2 2007-09-04
lisa pose la question :
how do I write a variable expression for word phrase example x less than = 2 or 2 less than p 4 fewer than job please help
Penny Nom lui répond.
Variable expressions 2007-09-04
Eric pose la question :
how so i write a numerical or variable expression for each quantity. example two dozen eggs or d dozen eggs number of quarts ub a 3 gallons
Penny Nom lui répond.
16x^2+4xy^2+8x divided by 4xy 2007-09-02
Ricardo pose la question :
how can i solve that problem of polynomial division?

16x^2+4xy^2+8x divided by 4xy

Penny Nom lui répond.
The quotient of thirty and ten times a number. 2007-09-02
Jenna pose la question :
I need help on How to translate a phrase into an algebraic expression: The quotient of thirty and ten times a number.
Penny Nom lui répond.
george, thomas, abe, alexander... 2007-09-01
lori pose la question :
george, thomas, abe, alexander... come up with the next few im confused and need help!!
Stephen la Rocque and Harley Weston lui répond.
Similar triangles 2007-08-29
James pose la question :
Question: In the triangle ABC, X is a point on AC. AX = 15 m and XC = 5 m. The angle AXB is 60 degrees and the angle ABC is 120 degrees. Find the length of BC.

I am sure to an extent that this has to do with similar triangles, but I am not certain.

Harley Weston lui répond.
Converting a repeating decimal to a common fraction 2007-08-22
isabelle pose la question :
how do you turn 6.333... into a fraction in simplest form?
Stephen La Rocque and Penny Nom lui répond.
More on the sixth degree equation 2007-08-21
Farzan pose la question :
Equation 1 :
(R + (6.67*5.98*10^13/((R^2)*2)))^2 - (R^2) = (7.27*(10^-5)*R)^2
Equation 2 :
(6.67*5.98*10^13/(R^2*2))^2 + 6.67*5.98*10^13/R = (7.27*10^-5*R)^2
As you see if we expand the left part of the first equation and simplify, the equations become same, but these two equations have different answers in my math software.The first one has 3 amounts for R, but the second one has 6 amounts. Why are the answers different ?

Stephen La Rocque lui répond.
A sixth degree equation 2007-08-20
Farzan pose la question :
Dear friends I need to solve this equation with an understandable method for high-school students : (6.67*5.98*10^13/(R^2*2))^2 + 6.67*5.98*10^13/R = (7.27*10^-5*R)^2 please solve this problem if you have time.
Harley Weston lui répond.
The area of a five sided lot 2007-08-19
Karyn pose la question :
I have been looking at your site, but I am still confused as to how to figure out the exact square footage of my irregular lot (since it is a gradual fan lot from the front, and triangles out in the back).
Harley Weston lui répond.
What is 240mL of water in cups? 2007-08-16
Gareth pose la question :
What is 240mL of water in cups?
Penny Nom lui répond.
Angle of depression to a football 2007-08-15
Tosin pose la question :
The angle of depression to a football from the top of building 10m high is 17 degrees. Find the distance of the ball from the foot of the building.
Stephen La Rocque lui répond.
Division by decimals 2007-08-15
Brooklyn pose la question :
I am studying for an exam, and I will not be able to use a calculator. I can not figure out how to do division is the number on the outside of the box is a decimal. Ex: 2/6.3=X Can you please help me figure this out?
Penny Nom lui répond.
The length of the third side of a triangle 2007-08-15
Brooklyn pose la question :
What is the equation to find the length of the third side of a triangle if you have the length of A, B, and the angles(s)?
Stephen La Rocque lui répond.
The tension in a single strand of wire 2007-08-13
Gene pose la question :
Seeking an equation that calculates the tension in a single strand of wire or rope. Conditions: the wire is fixed at both ends, A known weight is suspended from the center of the span. The weight will dipslace the strand downward some distance Y. Let the distance between the fixed ends be X= 500mm. Weight W=0.5kg. Original tension in the strand is T= 10 newtons.Your help sincerely appreciated.
Gabriel Potter and Stephen La Rocque lui répond.
Water bill woes 2007-08-12
Terry pose la question :
I know that a cubic foot of water=7.48051945 gals., but I keep getting my water bill and they go by thousands of a gal. per cubic foot. Is there a conversion that says that shows this? Water department=.763 x cubic foot used=thousands of gallons water used that month. Exampel: 72cu. ft meter reading x .763+ 58.--- galons of water I use in a month. Total 58=thousand = +gallons. This is wrong. There are only two people in the house.
Stephen La Rocque lui répond.
The swaying of a building in the wind 2007-08-11
San pose la question :
During a strong wind, a tall builing, such as the CN Tower, can sway back and forth as much as 100cm, with a period of 10 seconds. Please help me to determine the equation for this function, in the form y=asinkx
Stephen La Rocque lui répond.
Induction - divisibility 2007-08-04
Jerry pose la question :
How would you prove that for any positive integer n, the value of the expression 3^(2n+2) - 8n -9 is divisible by 64.
Chris Fisher and Penny Nom lui répond.
Rolling a metal plate 2007-07-31
k.a.suresh pose la question :
How to calculate the plate size for rolling (2010mm OD)plate thick is 6mm
Harley Weston lui répond.
Subdividing a property into half acre parcels 2007-07-31
Pamela pose la question :
We need to divide a large property with five sides and strange angles into 1/2 acre parcels from the top down. We want to know where along the eastern and western borders of the large property to make the divisions.
Stephen La Rocque lui répond.
Vehicle collision 2007-07-31
Tania pose la question :
If a driver falls asleep at the wheel of a newer model car and slams into the rear of a parked classic mustang (2860-3280lb) and the parked car is thrown 100 ft across the street, what would be the minimum speed required by the newer car in order to move the mustang?
Penny Nom lui répond.
320 acre lots 2007-07-29
melisa pose la question :
we are splitting a 320 acre parcel into five 35 acre lots with one 145 ace lot. I have the footage of each side there are eight: 5280 x 2640x2640then out1320x1320up x2640back inx1320upx1320this now would meet back to the 5280foot side i know there is a half of a square mile and 320 acres.what would the measurements be in feet for length to make a square or a rectangle to make a 35 acre lot?
Harley Weston lui répond.
Angle of depression 2007-07-23
joyce pose la question :
hello, here is my problem......
As you stand on a bridge w/c is 100 ft. above the water you are looking @ an approaching barge. If the A of top of the front of the bridge is 29.04 degrees and the angle of depression of the rear is 17.36 degrees . Find the length of the barge?

Harley Weston lui répond.
f(x) = (x^4) - 4x^3 2007-07-22
Michael pose la question :
I'm a student who needs your help. I hope you'll be able to answer my question. Here it is: Given the function f(x)=(x^4)-4x^3, determine the intervals over which the function is increasing, decreasing or constant. Find all zeros of f(x) and indicate any relative minimum and maximum values of the function.
Any help would be appreciated. Thank you for your time.

Harley Weston lui répond.
Angle of depression (declination) between sailboat observations 2007-07-18
Joyce pose la question :
From a cliff 150 ft above a lake, we see a boat sailing directly towards us. The angle of depression of the boat is seen to be 5 degrees and 7 inches and 11 degrees and 18 inches. Find the distance sailed between observations.
Stephen La Rocque lui répond.
The area of a property 2007-07-17
Mary pose la question :
I currently have an opportunity to sell my property to a business and they would like me to send a proposal to them with details. I need to know the square footage of my property and have tried using your formula from similar questions. The dimensions of my property are as follows
front line facing street: 19.908 m
right side : 37.338 m
back line : 29.779 m
left side : 43.983m
The front line and the right side are at right angles to each other. Can you formulate and reply? Thank you Mary

Harley Weston lui répond.
Sample size 2007-07-17
Nurse pose la question :
If a population has standard deviation 20, what is = the minimum sample size to be 95% confident that the error should be = accurate to within 4?
Harley Weston lui répond.
Radical 96 plus radical 27 divide by radical 3 2007-07-17
linda pose la question :
radical 96 plus radical 27 divide by radical 3
Penny Nom lui répond.
Trig functions for angles not between 0 and 90 degrees 2007-07-16
Tim pose la question :
My question: Why is the value of a trigonometric function, the same, for an angle over 90 degrees and its reference angle? How are the angle and its reference related? Do they both form a triangle that has equal sides?
Penny Nom lui répond.
The two towers (angles of elevation trigonometry) 2007-07-14
joyce pose la question :
The angle of elevation of tower B from the top of tower A is 28 degrees and the angle of elevation of the top of tower A from the base is 46 degrees Find the height of tower A if tower B is 120 m high?
Stephen La Rocque lui répond.
Any regular polygon inscribed in a circle 2007-07-12
DJ pose la question :
Circle with r=12" is inscribed in a regular octagon. What is the length of each octagon segment? Note: Our answer works for any regular polygon inscribed in any circle.
Stephen La Rocque lui répond.
Converting measurements 2007-07-11
Nicole pose la question :
if you have 8 oz of water how many cc: will there be.
Stephen La Rocque lui répond.
The probability of rolling double sixes twice in a row 2007-07-10
Matt pose la question :
what is the probability of rolling double sixes twice in a row?
Stephen La Rocque lui répond.
Grams of vodka 2007-07-10
Andrew pose la question :
milliliters to grams..vodka 80 proof?
Stephen La Rocque lui répond.
Derivative of a Function 2007-07-09
Bob pose la question :
What is the derivative of the function a sub n = [n/(n+1)]^n ?
Stephen La Rocque lui répond.
Proof that any side of a triangle is less than half the perimeter. 2007-07-07
Omkar pose la question :
Any side of a triangle is smaller than half of its perimeter, prove this in short ?
Stephen La Rocque lui répond.
Finding the radius of an inscribed circle 2007-07-05
Maria pose la question :
I need to find the radius of a circle which is inscribed inside an obtuse triangle ABC. I know all the angles and all the lengths of the triangle.
Stephen La Rocque and Chris Fisher lui répond.
Tons of concrete 2007-07-03
Trey pose la question :
I have 300,000 square feet of concrete and want to know how to convert this to tons?
Harley Weston lui répond.
A statistical difference 2007-07-03
a student pose la question :
I am writing a paper for a grad class in which I am comparing achievement levels of boys and girls. I have data that shows the average marks for girls and boys in each grade 12 subject for the entire province. My prof want me to show there is a statistical difference. What do I have to do to show this? I don't have access to the raw data, so don't know the SD. Is there anything I can do mathematically with the data that I have? (I can determine n for each set of data, it ranges between 2400 and about 13000 for each subject area.)
Chris Fisher and Harley Weston lui répond.
Expansion on a steel boat 2007-06-28
JOHN pose la question :
that is the expansion on a steel boat that is 300' long by 100' wide. if the water temp is 72deg f. and the deck temp is at 150deg f. I think the deck would grow in all dir. and by what dist? do I still use 0.00000645
Stephen La Rocque lui répond.
How do I convert milliliters(powder form) to grams? 2007-06-28
ed pose la question :
How do I convert milliliters(powder form) to grams
Harley Weston lui répond.
How do I convert inches to mm in my head? 2007-06-27
philip pose la question :
Hi, I would like to know how to convert inches to mm in my head, I use socket sets and want to know an easy way to work out what 3/16, 7/32 is in mm. Thanks Phil
Harley Weston lui répond.
sin|x| and cos|x| 2007-06-25
Mac pose la question :
Can anyone tell me whether sin|x| and cos|x| is differentiable at x=0 ? As far as i know, cos(x) and sin(x) is differentiable at all x.
Penny Nom and Stephen La Rocque lui répond.
Volume in a triangular water trough 2007-06-24
David pose la question :
A water trough has sloping sides of length 500mm making it triangular in cross section, with vertical ends. The width at the top is 600mm and the length is 2.0 metres.
(i) Calculate the capacity of the trough, giving your answer accurate to the nearest litre.
(ii) Find out the depth of the water when the trough is half full.

Stephen La Rocque lui répond.
Average speeds 2007-06-22
Dee pose la question :
A guy goes 3.1m a second for 29 seconds in a golf cart. He then walks 1.5 meters a second. How long does he have to walk to get the average speed of 2.1m a second?
Stephen La Rocque lui répond.
Simplify 2007-06-21
A student pose la question :
what is the answer of 3y+5/2(4y+1)+5y/2
Penny Nom lui répond.
Simultaneous equations : the Elimination method 2007-06-21
Patricia pose la question :
I need to find the value of X and Y using the Elimination method.

5/x + 3/y=4
25/x-2/y=3

Stephen La Rocque lui répond.
New wood siding 2007-06-20
Angela pose la question :
I have a trailer that is 14x70 and I took off the wood siding that was about 8 feet tall. They want $8.60 a cubic yard. How many cubic yards do I have and how much will it cost me. Thanks to all!
Stephen La Rocque and Penny Nom lui répond.
Making a box with a particular volume 2007-06-20
Kimberly pose la question :
How do you convert 487 cf into box?
Stephen La Rocque lui répond.
How many tons of sand? 2007-06-19
Richard pose la question :
I need to know how many tons of sand it would take to fill a container 20 feet long, 20 feet wide, and 6 inches deep. I am not sure of the makeup of the sand as far as dry, loose, wet, etc. If you could give me calculations of all the variants it would be appreciated.
Stephen La Rocque and Penny Nom lui répond.
Simultaneous inequalities 2007-06-18
Freddy pose la question :
Watson Electric has production facilities in Valley Mills, Marlin,and Hillsboro. Each one produces radios,stereos,and TV sets. There production capacities are

Valley Mills: 10 radios, 12 stereos, and 6 TV sets per hour Marlin: 7 radios, 10 stereos, and 8 TV sets per hour Hillsboro: 5 Radios, 4 Stereos, amid 13 TV sets per hour

QUESTION

How many hours should each plant be scheduled to fill an order of 1095 radios, 1230 stereos, and 1490 TV sets?

Stephen La Rocque lui répond.
Simplifying a quartic rational expression using long division 2007-06-14
Megan pose la question :
x+2/12x^4+17x^3+0x^2+8x-40=
Stephen La Rocque and Penny Nom lui répond.
The composition of functions 2007-06-14
Gilligan pose la question :
Question from Gilligan, a student:

Let f(x) = x^2, g(x) = 3x and h(x) = (sqrt{x}) + 1. Express each function as a composite of f, g and/or h.

(1) p(x) = 3(sqrt{x}) + 3

(2) Q(x) = (sqrt(sqrt{x}) + 1}) + 1

Penny Nom lui répond.
Angles of depression 2007-06-13
Phonda pose la question :
The pilot of a small private plane can look forward and see the control tower for a small airstrip. Beyond that is a large factory that is 3 milies from the airstrip. The angles of depression are 12.5 degrees and 4.8 degrees respectively. Find the airplane's altitude, to the nearest ten feet.
Stephen La Rocque lui répond.
Standard Deviation 2007-06-13
Adrian pose la question :
If you are told that the mean salary of a certain group of workers is $30,000 with a standard deviation of $4000, what proportion of workers earn over $38,000? What proportion of workers earn less than $18,000? Assume the distribution of wages is normal.
Stephen La Rocque lui répond.
Composition functions 2007-06-12
Gilligan pose la question :
Find functions f and g so that f(g(x)) = H.
(1) H(x) = (1 + x^2)^(3/2)
(2) H(x) = int(x^2 + 1)
I don't know where to start.

Stephen La Rocque lui répond.
Converting dollars to gallons 2007-06-12
Cynthia pose la question :
How do I solve this problem? If a family uses .20 per 100 gallon of water. How many gallons would $10.00 cost, divided amoung 3 people? Thanks, Cynthia
Stephen La Rocque lui répond.
How high does the ladder reach? 2007-06-11
Madi pose la question :
A ladder 8 ft long resting on a house makes a 60 degree angle with the ground. how far up the house does it reach?
Stephen La Rocque lui répond.
The area of a quadrilateral 2007-06-10
Lucy pose la question :
Calculate the area of the quadrilateral ABCD. AB= 4.1cm, BC = 7.6cm, AD= 5.4 cm, CD= ? Angle ABC = 117, Angle ADC = 62. Give your answer correct to 3 significant figures.
Stephen La Rocque and Penny Nom lui répond.
Rational polynomial expressions 2007-06-09
a student pose la question :
I have a question that continues to lead me to the answer x/(x - 1) but according to my math book, the answer should be 1/(x - 1). Who is right? Who is wrong? Here is the question: (x^2 - 6x - 27)/(x^2 - 11x + 18) DIVIDED by (x^3 + 2x^2 - 3x)/(x^2 - 2x)
Stephen La Rocque lui répond.
The law of sines 2007-06-09
Felicia pose la question :
A parallelogram has one side that is 12.0 cm and one angle that is 65°. The shorter diagonal is 25.0 cm. To the nearest tenth of a centimetre, how long is the other side of the parallelogram? Use the sine law.
Penny Nom lui répond.
Finding the area of a lot without knowing the angles 2007-06-05
Cristin pose la question :
I have a land-locked piece of land. I need to know the square footage in order to determine the acreage. My deed only gives the lengths of its five sides.
Stephen La Rocque lui répond.
Cubic inches and square feet 2007-05-31
keith pose la question :
is it possible to convert cubic inches to square feet.thanx
Stephen La Rocque lui répond.
The number of grams of sulfuric acid 2007-05-31
cookie pose la question :
Hi,
Can you please let me know if I've done this correctly?

Calculate the number of grams of sulfuric acid in 0.500L of battery acid if the solution has a density of 1.28 g/mL and is 38.1% sulfuric acid by mass.

Stephen La Rocque lui répond.
I want to divide my land 2007-05-27
alfredo pose la question :
i want to divide my land. It is north is 11.86 ft, the S is 110.00 ft, the W is 644.34 ft the E is 644.58 ft. which =to1.606 acre. how many feet going from N to S would it be to make 1.5 acre
Penny Nom lui répond.
Area of a hexagon (three ways to find it) 2007-05-24
Josh pose la question :
I have to work out the area of a hexagon when I know that the perimeter of it is 1000m. I have tried many different ways but I get different answers.
Stephen La Rocque lui répond.
Simplifying a square root 2007-05-24
Leigh pose la question :
I am trying to help my son. Simplify sq root 81 x to the 2nd power y to the 12th power.
Stephen La Rocque lui répond.
System of equations 2007-05-24
Chris pose la question :
Find all real solutions (x,y,z,w) of the system of equations:
2y= x + x/17, 2z= y + y/17, 2w = z + z/17, 2x= w + w/17

Penny Nom lui répond.
How many tons of dirt is this? 2007-05-23
Deb pose la question :
I need to know how many tons of dirt(6 inches deep)would it take to cover 8 acres?
Stephen La Rocque lui répond.
Converting yogurt 2007-05-21
Annie pose la question :
I'm trying to follow a diet plan. The diet says I should have a 125ml tub of natural low fat bio yogurt. The only problem is, the yogurt pot lists its weight as 150g (with a large 'e' after it). Can you tell me how much of the yogurt pot I'm suppost to have please, or give me a conversion chart to change from g to ml for natural bio yogurt?
Stephen La Rocque lui répond.
Converting mass of sand to volume (a sand ceremony) 2007-05-21
Linda pose la question :
I'm getting married. We are having a sand ceremony. The empty bottle we are using holds 800ml. I have bags of colored sand. Each bag is 30g. There is 7 people participating in this ceremony. What I need to find out is how many grams of sand i need for 7 people to participate to fill this jar.
Penny Nom lui répond.
Set up two simultaneous equations 2007-05-21
Admire pose la question :
The cost of producing windscreen wipers blades at a factory ais partly fixed (due to operating overheads) and partly dependent on the number of blades produced. It costs $300 to produce 1000, and $600 to produce 5000 blades. How much would it cost to produce 24000 blades?
Penny Nom lui répond.
Divisibility 2007-05-18
Ashish pose la question :
A number is divisible by 2^n if the last n digits of the number are divisible by 2^n. Why?
Penny Nom and Claude Tardif lui répond.
Null hypothesis 2007-05-13
Dani pose la question :
A poll of 1068 American voters indicated that 48% supported te Democratic candidate for presidency. At the 0.05 level of significance, test the claim that less than 50% of American voters preferred the Democratic candidate.
Penny Nom lui répond.
Find the sample size needed 2007-05-13
Mini pose la question :
Find the sample size needed to be 98% confident thata marketing survey on the proportion of shoppers who use the internet for holiday shopping is accurate within a margin of error of 0.02. Assume that the conditions for a binomial distribution are met, and that a current estimate for a sample proportion does not exist.
Penny Nom lui répond.
An octagonal sign 2007-05-13
Cathy pose la question :
An octagonal sign is made by cutting four identical triangles made from a rectangle calculate area of one of the discarded triangles. length of square=26cmx22cm. length of octagonal sides are 10cm x 13cm
Penny Nom lui répond.
Finding the hypotenuse without Pythagorus 2007-05-11
Shelbie pose la question :
How do i find the hypotenuse of a right traingle not using the pythagorean thereom if i have the measurements of the legs?
Stephen La Rocque lui répond.
Angle of Elevation 2007-05-10
Micky pose la question :
Two Buildings are on opposite sides of a street 40 feet wide. The taller of the two buildings is 580 feet tall. The angle of depression from the top of the tallest building to the shorter building across the street is 57 degrees. Find the height of the shorter building.
Stephen La Rocque lui répond.
A ton of sawdust 2007-05-10
David pose la question :
I am trying to do a conversion. A tractor trailer is loaded with 165 cubic yards of sawdust (I do not know the actual weight). I knw the wholesale cost as $1,000 for this amount, but would like to convert this to find out what the equivalent cost for a metric ton would be.
Stephen La Rocque lui répond.
Area of irregular surfaces 2007-05-09
Dustan pose la question :
I am working on a way to compute very accurate areas for irregular surfaces by using the idea of a largest possible circle...
Chris Fisher lui répond.
Converting from mm to cm 2007-05-08
Amanda pose la question :
How do you convert mm into centimeters?
Gabriel Potter and Steve La Rocque lui répond.
Probability of H.I.V. tests 2007-05-07
Danielle pose la question :
A medical test detects H.I.V. Among those who have H.I.V., the test will detect the disease with probability 0.95; among those who do NOT have H.I.V., the test will falsely claim that H.I.V. is present with probability 0.0125. Among those who take this test, 4% have H.I.V. The test is given to Lucille, and indicates that she has H.I.V. What is the probability that Lucille actually has H.I.V.?
Stephen La Rocque lui répond.
Evaluating sine and cosine 2007-05-06
Selimovic pose la question :
How can i solve sine or cosine for angle of, lets say 10°....Maybe it's easy but i don't know how...
Penny Nom lui répond.
A speaker box 2007-05-05
darell pose la question :
I am trying to build a speaker box, and i am trying to find out the measurements of a 1.5cubic feet box.
Penny Nom lui répond.
Square footage of a lot 2007-05-03
Linda pose la question :
I have two lots which I am trying to calcuate the square footage of

one lot is 50 x 285.72 x 50 x 270

2nd lot is 50 x 285.72 x 50 x 277.61

Any help would be appreciated. The answers would be GREATLY appreciated.

Penny Nom lui répond.
My commsion is 2.5% 2007-05-02
susan pose la question :
How do you do percentage say i sold a house for 350,000 my commssion is 2.5% how do i figure that out can you show the formula for calculator please thank you very much
Penny Nom lui répond.
Simplify -36x squared over 18x 2007-05-01
Emily pose la question :
Simplify -36x squared over 18x
Penny Nom lui répond.
A tugboat's speed 2007-04-30
Amanda pose la question :
a tugboat must travel 24 miles against a 4 mile per hour current on the Potomac River and return. At what constant speed must the tugboat travel to make the trip in 12 hours. Round answer to the nearest tenth mph.
Stephen La Rocque lui répond.
A couch sliding off a truck 2007-04-30
William pose la question :
A couch with a mass of 1 X 10^2kg is placed on an adjustable ramp connected to a truck. As one end of the ramp is raised, the couch begins to move downward. If the couch slides down the ramp with an acceleration of .70 meters per second when the ramp angle is 25 degrees, what is the coefficient of kinetic friction between the ramp and couch? I drew a force diagram and if I did it correctly I identified the forces involved as "mg" (mass x gravity), "Fn" (normal force) and the "Ff" (frictional force). I know that we have the couch sliding down the ramp a .70 m/s but I don't think this a force and I'm not sure how this info fits into the problem. I know that the formula for calculating the coefficient of friction is Ff/Fn. Based upon the force diagram I drew and calculated Fn to be 1082N. I can't seem to get past this point. How do I determine what the frictional force is?
Stephen La Rocque lui répond.
Simplifying a rational expression 2007-04-29
Tamika pose la question :
X^2 + 10X + 24
______________
X + 6
SIMPLIFY EACH RATIONAL EXPRESSION (IF YOU CAN'T SIMPLIFY IT, WRITE ALREADY SIMPLIFIED)

Stephen La Rocque lui répond.
How many tons of sand is needed 2007-04-25
Jennifer pose la question :
How many tons of sand is needed to cover 350 cubic square feet?
Penny Nom lui répond.
How can I convert milliliters to grams? 2007-04-18
April pose la question :
What if I'm using cow's milk, how can I convert milliliters to grams?
Stephen La Rocque lui répond.
By how many feet was each dimension increased? 2007-04-18
Becca pose la question :
A rectangle is 8 feet long and 6 feet wide. If each dimension is increased by the same number of feet, the area off the new rectangle formed is 32 square feet more than the area of the original rectangle. By how many feet was each dimension increased? I need a diagram and 5 or more sentences for an explanation. Thanks!
Stephen La Rocque lui répond.
Simultaneous equations 2007-04-16
kyrie pose la question :
simultaneous equation 4x + 3y = 21 2x * y = 8
Penny Nom lui répond.
Ounces and liters 2007-04-16
Simone pose la question :
I want to know how much is 80 ounces of water in liters?
Penny Nom lui répond.
Calculating interest 2007-04-15
Gerry pose la question :
Calculate the amount of interest received on £120.00 desposited in an account paying 3% simple interest for three years.
Stephen La Rocque lui répond.
The angle of depression 2007-04-14
Mary-Beth pose la question :
Two towers are 30 m apart. From the 15th floor, 40 m up, find the angle of depression to the base of the taller tower? I think the answer is 53, but the answer book says 37.
Penny Nom lui répond.
A hypothesis test 2007-04-09
Katrina pose la question :
I have already tried to do this problem but im having a very had time with it. Can you please help me.

Glamour Magazine sponsored a survey of 2500 prospective brides and found that 60% of them spent less than $750 on their wedding gown. Use a 0.01 significance level to test the claim that less than 62% of brides spend less than $750 on their wedding gown. How are the results affected if it is learned that the responses were obtained from magazine readers who decided to respond to the survey through an Internet Web site?

Penny Nom lui répond.
Yards of sand in a ton 2007-04-09
Teresa pose la question :
how many yards of sand are in a ton and how many yards of limestone does it take to make a ton
Penny Nom lui répond.
3 divided by 3 to it's fifth root 2007-04-06
Annie pose la question :
How do I transform the equation 3 divided by 3 to it's fifth root to simple radical form (getting the radical out of the denominator)?
Penny Nom lui répond.
Simplify (1/3 + 1/3x) / (1/x + x/3x) 2007-04-04
Farina pose la question :
how do i simplify (1/3 + 1/3x) / (1/x + x/3x)
Penny Nom lui répond.
What is the intensity 5m below the surface? 2007-03-31
david pose la question :
I have this question which I am supposed to set it up and solve as a differential equation. I know how to solve the diffrential equation but I am having hard time understanding this question. Here is the question: The intensity of light in the ocean decreases the deeper you dive. In fact, the rate at which the intensity decreases is proportional to the current intensity. Setup the corresponding differential equation and solve for I(Y), the intensity I as a function of current intensity Y. If the light intensity 2m below the surface is 25% of the intensity at the surface, what is the intensity 5m below the surface. Can you please explain to me what does it mean by current intensity and how do I set this equation up. Thanks for the help.
Penny Nom lui répond.
The size of a lot 2007-03-30
Phyllis pose la question :
Could you please figure out the square footage and acreage of my lot? One side is 480ft One side is 410ft One side is 480ft The last side is 410ft Thank you.
Penny Nom lui répond.
6- team schedule for softball 2007-03-29
Angie pose la question :
I have 6-teams that can only play 3 days a week. Each team must get 18 games in for the season. I have to split them being the home team and the away team sometimes.
Penny Nom lui répond.
Cut a cake into four pieces 2007-03-27
haley pose la question :
A cake measures 10 inches x 10 inches. The cake was cut into 4 pieces that were the same size. What could the size be of each piece?
Penny Nom lui répond.
Factoring a trinomial 2007-03-27
Kim pose la question :
Hi, could you please help me solve this.

3x(squared) +20x - 7

Leeanne Boehm lui répond.
The distance between two fire towers 2007-03-23
tony pose la question :
Two fire towers are 30km apart, tower A is due west of tower B. A fire is spotted from the towers, and the bearing from A and B are N76degreesE and N56degreesW, respectively. Find the distance from the fire to the straight line connecting tower A to tower B.
Stephen La Rocque lui répond.
The law of cosines 2007-03-23
chetna pose la question :
Q 1) In triangle LMN, l=7, m=5 , n=4. find ANGLE N. After applying the rule and substituting values i'm getting Cos n= 58/40. Is there something wrong. The answer at the back of the book is 34 degrees.
Penny Nom lui répond.
Adding and Subtracting Rational Expressions 2007-03-21
Pricilla pose la question :
Pricilla

I do not know how to do this problem. Don't know where to start.

[(5)/(2x-8)]+[(3x^2+15)/(x^3-4x^2+5x-20)]

Stephen La Rocque lui répond.
Angles of depression 2007-03-21
romaine pose la question :
a woman of height 1.4m standing on top of a building of height 34.6m veiws a tree some distance away. she observes that the angle of depression of the bottom of the tree is 35 degrees, and the angle of depression of the top of the tree is 29 degrees. assume that the building and the tree is on level ground.
(a) calculate the distance of the woman from the top of the tree measured along her line of sight.
(b) determine the height of the tree.

Stephen La Rocque lui répond.
Synthetic division 2007-03-21
Edward pose la question :
Hi there, please, explain me synthetic division of polynomial functions. for examp.: 3x3 + 2x2 +4 divide by x-2 (number after variable x is the powre of x ) Thank you. Edward.
Melanie Tyrer lui répond.
n-1/(n+1)! + n+1/n! 2007-03-18
Cody pose la question :
How do you go about simplifying something like this; n-1/(n+1)! + n+1/n!?
Steve La Rocque and Claude Tardif lui répond.
Percentage markup 2007-03-16
Debbie pose la question :
What formula or formulas do I use if I want to ultimately charge a customer $300 for a service, but need to factor in a 15% commission for a sales rep, $20 to cover the cost of our overhead, the cost of a $25 coupon that we will be sending to the customer to apply to future services. In other words, what amount do I initially quote the customer to be able to cover these costs?
Stephen La Rocque lui répond.
Conversion 2007-03-16
Andrew pose la question :
If a lawn is 95.3 square yards, how do I convert that to square meters?
Stephen La Rocque lui répond.
Concrete sand 2007-03-08
david pose la question :
Can you tell me how much 4 cubic yards of concrete sand ways in tons? THANK YOU.
Stephen La Rocque lui répond.
Rotor-ride 2007-03-07
Jessie pose la question :
In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room". The room radius is 4.6m and the rotation frequency is 0.550 revolutions per second when the floor drops out. What is the minimum coefficient of static friction so that people will not slip down? People on this ride say they were "pressed against the wall". Is there really an outward force pressing them against the wall? If so, what is its source? If not, what is the proper description of their situation (besides scary)?
Stephen La Rocque lui répond.
The volume of a trailer 2007-03-04
Ron pose la question :
I just can not seem to work this out, i think it is old age catching up with me, I am buying a trailer that is 25 feet long 7.5 foot wide and with 4 foot sides and i am trying to work out how many m3 it will hold can anyone help. Thank you in advance for any help. Regards Ron
Penny Nom lui répond.
A square 2007-03-02
Jake pose la question :
how many sides does a square have?
Sara Ulmer lui répond.
Grams to millilitres 2007-03-02
anton pose la question :
I am trying to convert 28 grams of weight loss powder into mils
Gabriel Potter lui répond.
Mutually exclusive events 2007-03-01
kalyssa pose la question :
will you me an example of two events that are mutually exclusive and could you explain to me what mutually exclusive means?
Steve La Rocque, Pam Fowler and Penny Nom lui répond.
How many yards of concrete? 2007-02-28
jeremy pose la question :
I need to figure how many yards of concrete to use. I work for an asphalt company, and we are expanding into concrete. Currently we measure everything in sq. ft. So we came up with 6,960 sq ft of concrete to remove and replace. Currently there is 6" of concrete, and 2" of bedding material. We would like to replace only 4.5" of concrete, the rest in bedding. Here is how I figured, am I correct. 6,960 Sq ft (to simplify I made the Sq ft 350 X 20 ) 350 ft X 20 ft X .33 (1/3 ft or 4") = 2,310 cubic feet 2,310 cb ft / 27 = 85.55 cubic yards Is this correct?
Penny Nom lui répond.
Simultaneous equations with fractions 2007-02-28
Alyca pose la question :
Hello Math Central, I am a grade 10 student taking Academic math. Our unit right now is method of substitution and elimination. I'm stuck on this one question that I've been doing forever. Please help =)

*For this equation I have to do method of elimination, but it's so much harder with fractions...could some one please explain to me how to do it step by step?*
x y 2
-- - -- = - --
3 6 3

x y 1
-- - -- = 1---
12 4 2

Steve La Rocque and Ashley Mang lui répond.
Similar triangles 2007-02-21
Vivienne pose la question :
The lengths of the sides of a triangle are 8, 15, & 17. If the longest side of a simlar triangle is 51, what is the length of the shortest side?
Stephen La Rocque and Penny Nom lui répond.
The length of the side of a hexagon 2007-02-19
Nick pose la question :
if the area of a regular hexagon is 259.807 how do i find the length of each side, and the apothem? thanks if you can help
Penny Nom lui répond.
What is the remainder when 3^2007 is divided by seven? 2007-02-18
Chris pose la question :
What is the remainder when 3^2007 is divided by seven??
Leeanne Boehm lui répond.
Optical illusions 2007-02-18
Jami pose la question :
Hi, I'm Jami and I'm in 10th grade.I'm doing a geometry research project on optical illusions and need to know how math is involved.I have an idea already of how our eyes percept 2 dimensional images and construct them into 3D images but, that isn't my question.There are many books that contain optical illusion pictures that have secret messages in them or have objects popping out. Is there a mathematical way in that optical illusion pictures are constructed?
Walter Whiteley and Harley Weston lui répond.
A gymnast is swinging on a high bar. 2007-02-14
William pose la question :
A gymnast is swinging on a high bar. The distance between his waist (center of mass) and the bar is 1.1 m. If his speed at the top of his swing is zero and his gain in speed is due entirely to his change in gravitational potential energy, find his speed at the bottom of his swing.
Stephen La Rocque lui répond.
Centimeters to cubic meters and grams to kilograms 2007-02-14
Colleen pose la question :
A box of balls measures 120cm by 20cm by 20cm and weighs 48 g.
One thousand boxes = x cubic meters and weighs x kilograms.
Also, one million boxes = x cubic metes and weighs x kilograms.
One billion boxes = x cubic meters and weighs x kilograms. Solve for x.

Stephen La Rocque lui répond.
Density 2007-02-09
Judy pose la question :
How do I calculate the mass in grams of 125mL of chloroform when d=1.49g/mL.
Stephen La Rocque lui répond.
Conversions 2007-02-09
Donna pose la question :
Hi! I hope you can help me... What is the cost of 10 grams platinum if one ounce = $1200 (troy weight)? I REALLY appreciate your help. Can you please send me the formula to figure it out too? Thank You! Donna :)
Stephen La Rocque lui répond.
How many grams are in a 12 ounce coconut? 2007-02-08
Tristan pose la question :
I have a problem where I need to know how many grams are in a 12 ounce coconut. Do I use "dry measure" with figuring out how many grams are in a ounce? And is that about 28 grams? Thanks.
Penny Nom lui répond.
Converting sq inches to sq millimeters 2007-02-08
Michael pose la question :
If I have 1/32 sq inches, what does that equal in sq millimeters?
Stephen La Rocque lui répond.
Simultaneous equations with envelopes 2007-02-08
Mick pose la question :
There were 17 envelopes bought, some were brown, some were white. The brown envelopes cost one cent more per envelope than the white ones. The total cost was 80 cents. How much of each type of envelope was bought? --Many thanks!
Stephen La Rocque lui répond.
Find the next 3 terms of the sequence 2007-02-07
rose pose la question :
find the next 3 terms of the sequence 2,3,9,23,48,87
Penny Nom lui répond.
Multiplying and dividing by zero 2007-02-05
colin pose la question :
i would like to if u multiply 1,000,000 by 0 does it equal o or 1.

if you have a number eg 15689 and you divide by o what would the answer be is it 1

Penny Nom lui répond.
Driving on a banked roadway 2007-02-05
William pose la question :
A race track is shaped like an inverted cone. Race cars drive around this track in a horizontal path. If a drivers speed is 34 m/s, at what distance from the tip of the cone should he drive his car if there is no friction?

THANKS IN ADVANCE FOR ANY ASSISTANCE YOU CAN PROVIDE!

Sincerely,
William Bush

Stephen La Rocque lui répond.
The substitution method 2007-01-31
Victoria pose la question :
how do i solve this problem using the substitution method?
2x-5= -14
-7x+14y= -5

Stephen La Rocque lui répond.
The elimination method 2007-01-31
Addrianna pose la question :
x-2y=2
3x-5y=7

Stephen La Rocque lui répond.
The density of an irregular wooden block 2007-01-30
Carlos pose la question :
I'm trying to help my son but I don't really have too much knowledge about this topic. he is been asked to convert 10 milliliter to gram, I think that since 1 g = 1ml the answer will be 10 g also there is another question of how of the density of an irregular wooden block is affected if:
a) the center is hollow:
b) the block is not completely submerged when determining the volume.

Stephen La Rocque and Penny Nom lui répond.
Simplify 18e^2fg/32eg^2 2007-01-30
Morgan pose la question :
how do you simplify 18e^2fg/32eg^2
Penny Nom lui répond.
Height of a right triangle? 2007-01-29
Engelbert pose la question :
The base of the right triangle is 50 ft. At the angle (on the base of the triangle) across from the right angle is labeled portion (a triangle within a triangle), the base of this little triangle is 10 ft. and the height is 6 ft. What equation can i use to solve this?
Steve La Rocque and Haley Ess lui répond.
A curve on a cylinder 2007-01-27
John pose la question :
think of a tube,say 50mm in diameter made out of cardboard, project vertical lines at right angles from the base at say every 2mm right round the tube in pencil.No pretend you can put this cardboard tube in a saw and cut it at 45degrees. Get a pair of scissors and cut it at the lowest end and lay it out flat.It now looks like a graph,how do you work out each of these vertical lengths possibly chord lengths
Stephen La Rocque and Penny Nom lui répond.
The altitude of regular n-side pyramid 2007-01-26
Wendimu pose la question :
The altitude of regular n-side pyramid is half of it's base side.What is the angle between the lateral face and it's base?
Penny Nom lui répond.
Grams and mls 2007-01-26
Larissa pose la question :
Is there a formula to convert grams to mls..?
Stephen La Rocque lui répond.
What is the point of intersection of two sides of a polygon? 2007-01-23
Tyler pose la question :
What is the point of intersection of two sides of a polygon?
Stephen La Rocque lui répond.
Is -2^2 = -4 or 4? 2007-01-23
Joan pose la question :
Is -2 squared, when written without parentheses around the -2, -4 or could this correctly be solved by squaring -2 (-2 x -2) for an answer of 4? Or, to correctly get an answer of 4, would the problem have to read (-2) squared?
Stephen La Rocque lui répond.
Simplify (2x)^4 (1/2x^3)^2 2007-01-21
Sarah pose la question :
Simplify (2x)^4 (1/2x^3)^2
Penny Nom lui répond.
Why zero is neither prime nor composite? 2007-01-17
Brenda pose la question :
Why zero is neither prime nor composite?
Penny Nom lui répond.
In the shadow of a building 2007-01-11
Bill pose la question :
if a building b feet cast a shadow f feet long, then, at the same time of the day, a tree t feet high will cast a shadow, how many feet long?
Stephen La Rocque lui répond.
How do the perimeters of the two pentagons compare? 2007-01-02
Robert pose la question :
If the area of one pentagon is eighty-one times the area of another pentagon, how do the perimeters of the two pentagons compare?
Penny Nom lui répond.
Who invented the division symbol? 2006-12-29
Alex pose la question :
Who invented the division symbol?
Penny Nom lui répond.
6/x-2y - 15/x+y = 0.5 2006-12-21
Emeka pose la question :
6/x-2y - 15/x+y = 0.5
Stephen La Rocque lui répond.
7.2 oz per sq. yard equals ? __ grams per sq. meter 2006-12-20
Carol pose la question :
7.2 oz per sq. yard equals ? __ grams per sq. meter
Penny Nom lui répond.
Splitting A Circle Evenly 2006-12-20
Joe pose la question :
I'm trying to make a game board and instead of having it square, I would like to give it a curve (the game is Parcheesi). The attached diagram is pretty much completed (done in AutoCAD). What I would like to know is how to manually find the points that intersect the red line. In other words, evenly split the semi-circle into 8 pieces.
Penny Nom lui répond.
I want to convert milliliters into grams. 2006-12-14
Kenchotenzin pose la question :
I want to convert milliliters into grams.
Penny Nom lui répond.
Drilling holes in a cube 2006-12-12
Liz pose la question :
What is the volume of the solid remaining if a unit cube has a hole drilled thru one face to the opposite side and the hole that is drilled is a cylinder of unit diameter. Then the cube is rotated and an identical hole is drilled from an untouched face to the opposite side. Then the cube is rotated and an identical hole is drilled between the last two untouched faces. This will result in the cube vertices and the remaining volume of the cube falling into 8 parts. What is the total volume of these 8 parts. How is this volume calculated?
Penny Nom lui répond.
Base 5 2006-12-11
Shelley pose la question :
how do you convert decimal numbers to a given base for example 2,875 to base five?
Stephen La Rocque lui répond.
lim x-->infinity cos x 2006-12-07
Katie pose la question :
I was wondering if it was possible to find: lim x-->infinity cos x
Stephen La Rocque lui répond.
The square footage of an irregular lot 2006-12-07
Lori pose la question :
If I have a rectangular irregular sized lot with the following:

A - 110.53'
B - 159.87'
C - 127.28'
D - 165.86'


How do I determine the square footage?

Penny Nom lui répond.
What is the diameter of the planet? 2006-12-07
Niall pose la question :
In April 2005, scientists claimed to have captured light from an extrasolar planet orbiting a brown dwarf in the constellation Hydra some 230 light-years from Earth. The scientists believe the planet is about five times the mass of Jupiter.

Assume the planet has the same density as Jupiter. What is the diameter of the planet?

Stephen La Rocque lui répond.
Sigma notation 2006-12-05
Marie pose la question :
how do i get this in sigma notation...i only need an explanation 1^2 + (2+3)^2 + (4+5+6)^2 + (7+8+9+10)^2....
Penny Nom lui répond.
solve; 2006-11-28
Monique pose la question :
solve; f(f(x)) = 2x + 4 ; if f(x) = 1
Penny Nom lui répond.
(x - 5)/3 - 3/2 = (4x + 7)/6 2006-11-23
Terri pose la question :
I have never had algebra before and I am finding it difficult.Can you please help me work this problem out?

(x - 5)/3 - 3/2 = (4x + 7)/6

Penny Nom lui répond.
Dimensions of a rectangle 2006-11-22
Terri pose la question :
How can you find the dimensions of a rectangle that has a perimeter of 18 feet?
Stephen La Rocque lui répond.
cos2x=1 2006-11-21
Christina pose la question :
I'm have a hard time solving cos2x=1 for exact values between 0<_x <360
Stephen La Rocque and Penny Nom lui répond.
The height of a building 2006-11-19
Sweetie pose la question :
I have to figure out the measure of the water towers antenna on my schools campus using up to two items created by me and a manual. I don't know far away we are going to have to be. I need to have a fool proof way to figure out the distance to the tower. I have an idea using trigonometry but its really roughly estimated. Do you have any suggestions?
Stephen La Rocque lui répond.
Composition of functions 2006-11-19
RJ pose la question :
Let f0(x) = 2/2-x and fn+1 = f0 o fn for n greater than or equal to 0. Find a formula for fn and prove it by mathematical induction. Recall that o represents function composition. i.e., (f o g)(x) = f(g(x)).
Stephen La Rocque lui répond.
Composition of functions 2006-11-18
Oryan pose la question :
Given f(x)=-2x^3 and g(x)-4x-5, find g(f(-1))
Stephen La Rocque lui répond.
An aircraft and a missile 2006-11-18
Sarah pose la question :
an aircraft is flying at a constant altitude with a constant speed of 600mph. an antiaircraft missile is fired on a straight line perpendicular to the flight path of the aircraft so that it will hit the aircraft at a point P. at that instant the aircraft is 2 miles from the impact point P the missile is 4 miles from P and flying at 1200 mph. at that instant, how rapidly is the distance between missile and aircraft decreasing?
Stephen La Rocque lui répond.
Converting cubic meters to gallons and liters 2006-11-16
Lorne pose la question :
I have a large tank and I would like to know the formula for the conversion. And do you have any other info on web sites that have conversion tools as most of the tools are in u.s and I live in Canada and need the metric conversions.
Stephen La Rocque lui répond.
How to show my work when I simplify this 2 - 2[4 - 9] ÷ (-5)? 2006-11-14
Remada pose la question :
How to show my work when I simplify this 2 - 2[4 - 9] ÷ (-5)
Penny Nom lui répond.
Motorcycle expansion chamber design 2006-11-14
David pose la question :
I'm interested in calculating cone information regarding motorcycle expansion chamber design for example. I guess it's called a truncated cone, from what I've read so far. If I know the center line height, small radius, and large radius of a truncated cone then, how can I calculate the angle (included angle?) the cone forms? I'd like to know the variations of the formula so I can calculate for angle, or length, or one of the diameters if I know the other two measurements.
Stephen La Rocque lui répond.
15g/50g^3 2006-11-12
Nicole pose la question :
How do u simplify the variable expression? 15g/50g^3
Penny Nom lui répond.
Simplifying exprressions 2006-11-06
Jessica pose la question :
-21(a+2b)+14a-9b
Stephen La Rocque lui répond.
Simultaneous equations 2006-11-06
An other pose la question :
e^2y-x+2=0
ln(x+3)-2y-1=0

Penny Nom lui répond.
3x+4y+7x+9+2 2006-11-03
Chavon pose la question :
3x+4y+7x+9+2 I don't get it please help
Stephen La Rocque lui répond.
The dimensions of a rectangle 2006-11-02
Ben pose la question :
A rectangle's length is 8 cm. greater than its width. Its perimeter is 128 cm. Find its dimensions.
Penny Nom lui répond.
3-6+4X3= 2006-10-25
Tom pose la question :
3-6+4X3=
Penny Nom lui répond.
(2/3)^2/(4/2)/1/3 2006-10-25
Jena pose la question :
how do i simplify this problem? (2/3)^2/(4/2)/1/3
Stephen La Rocque lui répond.
how many feet in 200 yards? 2006-10-24
Audrey pose la question :
how many feet in 200 yards?
Karen McIver lui répond.
Simplifying radicals 2006-10-23
Christin pose la question :
i would like for you to solve this problem?? 6 square root 8
Stephen La Rocque lui répond.
Octagonal Stop Sign 2006-10-23
Phil pose la question :
My colleagues and I are in a discussion about how many true "sides" an octagonal stop sign has. I say that it has 10 true sides because of the front back sides of a stop sign (3D octagon). Is this correct terminology or should the front and back "sides" be referred to as faces -- equaling 2?
Paul Betts, Steve La Rocque and Harley Weston lui répond.
how many ounces are in 750 cc's. 2006-10-14
Not a teacher pose la question :
how many ounces are in 750 cc's.
Stephen La Rocque lui répond.
How do you write a variable expression 2006-10-11
Josh pose la question :
How do you write a variable expression for the following:

The amount of money Waldo has if he has $10 more than Joe and

How much weight Kirk can lift if he lifts 30 lbs more than his brother.

Stephen La Rocque lui répond.
Metric conversion 2006-10-08
Eve pose la question :
45.6 microliter to megaliter?
Stephen La Rocque lui répond.
Two problems involving density 2006-10-06
Patricia pose la question :

1. Nick has to ship 650,000 g of substance A to Singapore. The density of substance A is 3.23g/cm^3. If the delivery charge is 0.25 centavo per cm^3,how much does he need to pay?

2.Ann ordered 150 balloons for a birthday. Each balloon has a radius of 20cm. If the density of helium is 0.124g/cm^3,how many grams of helium is needed to meet the order?


Stephen La Rocque lui répond.
Divisibility by 9 and 11 2006-10-04
Prakai pose la question :
can 818991 divisible by 9, or 11?
Penny Nom lui répond.
An expansion and a translation 2006-09-25
meghan pose la question :

Write the equations for f(x) = squareroot(4 - (x - 2)^2) after:

a) a horizontal expansion by a factor of 2
Answer: f(x) = squareroot(4 - (1/2x - 2)^2)
b) a horizontal translation 3 units left
Answer: f(x) = squareroot(4 - (x + 1)^2)
c) the expansion in part a), then the translation in part b)
d) the translation in part b), then the expansion in part a)

I understand how to do a) and b), but I'm not sure what I'm supposed to do for the equations in a specific order (expansion, then translation vs. translation, then expansion).


Penny Nom lui répond.
How do I determine the acreage? 2006-09-20
Charlene pose la question :
I have a survey of property with various points on it; how do I determine the acreage?
Penny Nom lui répond.
How large is the property? 2006-09-20
Jahn pose la question :
a triangular lot has 750 feet on one side of a 90-degree angle and 500 feet on the other side of the angle. how large is the property?
Penny Nom lui répond.
The square footage of my property 2006-09-17
Jack pose la question :
I have been trying to calculate the square footage of my property, without success. The measurements are below. Is there a simple formula that can be used based upon the outside parameters? Or, is there a simple way to calculate the square footage?
Stephen La Rocque and Penny Nom lui répond.
The length of 2 sides of a triangle 2006-09-15
Lonnie pose la question :
I need to know how to figure the length of 2 sides of a triangle, as the following example:

The length of the bottom is 12' and the angles are 45, 45 I need to know how long the other 2 sides must be to get an angle of 90 at the top.
Stephen La Rocque lui répond.

Square roots in a binomial expansion 2006-09-11
Sydney pose la question :
(√x + 5)4 expanded using the binomial theorem
Penny Nom lui répond.
Plotting co-ordinates on a number plane 2006-09-08
Victor pose la question :
I need to plot co-ordinates (0,2), (2,-2), (-2,0), and (0,0) on a number or co-ordinates plane, I am not sure how to do this, and get lost after the first point, can you please help?
Penny Nom lui répond.
Metric Conversions 2006-09-02
Patricia pose la question :
I have a new difficulty, metric conversion when it involves the prefixes. Some problems I need help with are:
Stephen La Rocque lui répond.
Cubic yards of trash 2006-08-23
Chris pose la question :

I am journalist in California trying to convert cubic yards of trash (appliances, furniture, tires and household trash) into the space of a football field.

Is there a formula for this?

For example, how much of an American football field would 45,000 cubic yards of said trash fill up? The typical American football field I am told is 120 yards (110 meters) long by 53 1/2 yards (49 meters) wide

Ideally, I'd like to be about to say this amount of trash would fill up the football field XX-feet deep


Penny Nom lui répond.
Approximately what is the acreage? 2006-08-17
Lisa pose la question :
An ad describing a lot size of 73x150. Approximately what is the acreage?
Stephen La Rocque lui répond.
How fast is the water level rising 2006-08-12
Erin pose la question :
Water runs into a conical tank at the rate of 9ft3/min. The tank stands point down and has a height of 10 ft. and a base radius of 5 ft. How fast is the water level rising when the water is 6 ft. deep? (V=1/3 pi r2 h).
Penny Nom lui répond.
The area of a lot 2006-08-05
Lyn pose la question :
I have no idea how to find the square feet of an uneven polygon. I am in the process of making a land agreement and need to know.
Please tell me how to figure out the footage and acreage of land as follows.
road-front 360'
back 360'
left side 220'
right side 180'

Penny Nom lui répond.
Grams and milliliters 2006-07-27
Poh pose la question :
We would like to know the conversion of 1 gm of cream/powder to ml.
Stephen La Rocque and Penny Nom lui répond.
Converting fractions to decimals 2006-07-25
Diane pose la question :
HOW DO I CONVERT A FRACTION TO A DECIMAL? (E.G,. 8/14 to ? )

And HOW DO I DIVIDE A FRACTION (e.g., 1/14 divided by 3) and then convert that answer to a decimal?

Penny Nom lui répond.
How many miles are there in 30 furlongs? 2006-07-22
Jennifer pose la question :
If there are 8 furlongs in a mile, how many miles are there in 30 furlongs?
Steve La Rocque and Paul Betts lui répond.
The lot is a very odd shape 2006-07-20
Liz pose la question :
I have a square footage question. I'm looking at buying a piece of land and would like to know how to calculate the square footage of it. The lot is a very odd shape and I have attached a drawing of the lot:
Stephen La Rocque lui répond.
The dimensions of a rectangle 2006-07-09
Lori pose la question :
The length of a rectangle is 1 cm more than 3 times its width. If the area of the rectangle is 61 cm2, find the dimensions of the rectangle to the nearest thousandth.
Penny Nom lui répond.
A problem with arc sine 2006-07-07
Scott pose la question :
How to prove arc sin x = arc tan( (x)/√(1-x2))
Penny Nom lui répond.
Two algebra questions 2006-07-02
Majeedah pose la question :

I'm upgrading thru correspondence and haven't been in school for a long while, so I have no class or teacher to explain the basics to me.

I have a couple of questions:

The problem is this:

  1. f(x) = x2 - 2, Find the expression.

    Q f(-x)
    A x2 - 2

    Why is the answer not -x2 - 2?

  2. A relation f, is given by f(x) = x - 2/x. Find the expression.

    Q 2/f(3)
    A 6

    How do you get the answer.


Stephen La Rocque lui répond.
An octagon shape flower bed 2006-06-24
Brandy pose la question :
hello my name is brandy my husband and I would like to build an octagon shape flower bed to put around the tree in the front yard we would hope to have the whole shape about 4 ft-5 ft around the tree. what would be the way to find out how to cut each side to that they fit together equally
Penny Nom lui répond.
A side segment of an octagon 2006-06-24
Ed pose la question :
I would like to know how to find a side segment of an octagon when I know that my octagon is 9 feet from side to side and top to bottom?
Stephen La Rocque lui répond.
A trig problem 2006-06-24
Greg pose la question :
A and B are two towers, B being 4 km due east of A. The true bearings of a flagpole, C, from A and B are α east of north and α west of north respectively. The true bearings of a second flagpole, D, from A and B are (α + β) east of north and (α - β) west of north respectively. Assuming A, B, C, and D are on level ground, and that α = 25, β = 10, find the distance between C and D.
Penny Nom lui répond.
simplify 7x + 4y + 2x - 6y 2006-06-21
Alan pose la question :
simplify 7x + 4y + 2x - 6y
Paul Betts lui répond.
What should the length of the other sides? 2006-06-20
Kevin pose la question :
if a property is basically square for 5 acres and one side is 340 feet what should the length of the other sides?
Stephen La Rocque lui répond.
A 52 cubic foot box 2006-06-14
Konstanze pose la question :
I need to figure out what LXHXW I need to create a 1.5 cubic meter or 52 cubic foot volume--there is an answer in your database that relates to this..but it does not give the formula to go from cubic feet/inches to a measurement for a box.

Empirically I can figure out that 3 x 3 x 3 equals 27 and that 3.5 feet (42") x 3.5 x 3.5 equals 42.87 and 3.75 x 3.75 x 3.75 equals 52.73 which is about 1.5 cubic meters (1cubic meter = 52.971643 cubic feet) i.e a box 45 x 45x 45 "

There must be an easier way.

Penny Nom lui répond.
The chord length of a polygon 2006-06-14
Krishna pose la question :
I have to find out the chord length of a polygon - Tetradecagon ! The Radius of the Circle is 11.5 Cms. The Circle is intersepted by 14 arcs. Then how to find out the chord length?
Stephen La Rocque lui répond.
Fahrenheit and Celsius 2006-06-12
Doris pose la question :
I just know how to do problems with fahrenheit or celcius. Could you show me step by step how to do these? Then I can do it if you can show me each step of the way.
Stephen La Rocque and Penny Nom lui répond.
Designing a garage 2006-06-08
A builder pose la question :
I'm currently designing a garage and came upon this interesting math problem. I've tried using various methods to solve it but have so far been unsuccessful. I've included a picture as its far easier to show you my question than explain it verbally. I realize it could be done by trial and error but i'm looking for a real solution.
Stephen La Rocque and Penny Nom lui répond.
Buying some carpet 2006-06-05
Russ pose la question :
My room is 24 ft. long and 17 ft. wide. I need to know how many square feet are in 1 yd.²
Penny Nom lui répond.
Simultaneous Equations 2006-05-24
Angie pose la question :

Question: solve the equations
2x-3y-z=0
3x-2y+z=-5
x+3y-2z=14

for x,y,z


Stephen La Rocque lui répond.
The sides of a hexagon 2006-05-24
Emilio pose la question :
I need to find the measure of the sides of the hexagon that the area is 58 square units.
Stephen La Rocque lui répond.
The interior angles of a right triangle 2006-05-20
Greg pose la question :
I am wondering if there is a way to figure out the interior angles of a right triangle if we know ONLY the side lengths, and the trick is, we CANNOT use arctangent!
Leeanne Boehm and Penny Nom lui répond.
What are the dimensions of the field? 2006-05-14
Angie pose la question :
The length of fence required to enclose a rectangular field is 3000 metres. What are the dimensions of the field if it is known that the difference between the length and width is 50 metres?
Penny Nom lui répond.
What is 2/3 divided by 5? 2006-05-11
KH pose la question :
What is 2/3 divided by 5?
Penny Nom lui répond.
8-digits numbers with their digits in decreasing order 2006-05-09
Headmaster pose la question :
How many 8-digits number are there with their digits in decreasing order
Penny Nom lui répond.
Cutting a piece of PVC pipe 2006-05-03
Shonda pose la question :
A plumber has a 10' piece of PVC pipe. How many 9/5 foot pieces can be cut from the 10' piece?
Penny Nom lui répond.
Simplifying with negative exponents 2006-05-02
Kristine pose la question :

I am having a hard time understanding factoring and multiplying polynomials. I have a couple of problems I just can't get, can you please help me?

Simplify, do not use negatives in the answer:
(5a-1b-7)(-2a4b2)

and:
(5x2y-7z)(-4xy-3z-4)


Stephen La Rocque lui répond.
How much does 1300cc of liquid weigh? 2006-04-28
Debra pose la question :
How much does 1300cc of liquid weigh, and how is the formula equated?
Stephen La Rocque lui répond.
Odd-man out coin tossing and probabilities 2006-04-27
Kalyan pose la question :
When four people toss fair coins, what is the probability that in a given toss there will be one "odd man". That is one person whose coin does not have the same out comes as that of any other members?
Stephen La Rocque lui répond.