.
. 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 »
. .
Fresh off the press   Voici les articles les plus récents
de notre base de données:
. .
nouvelle recherche

 
Page
96/886
The degree of a polynomial 2015-01-05
Nichole pose la question :
How do I determine the degree of polynomials? I've searched this on sites but they are all so confusing! Is there a simple explanation or way to find what the degree is? Some examples are: 6x^4 10x^2yz^5 and 3m^2n^7-10m^8. I also have to say that I am under the impression that this symbol ^ means the number after it is an exponent.
Robert Dawson and Harley Weston lui répond.
A silo is composed of a hemisphere and a cylinder 2015-01-03
Ami pose la question :
A silo is composed of a hemisphere and a cylinder. The total height for the silo is 20m and the diameter of the silo is 8m. What is the volume of the silo to the nearest cubic meter?
Penny Nom lui répond.
Filling a tub 2015-01-02
Mr pose la question :
The cold tap can fill a bath in 5minutes,the hot tap in 15,and the waste pipe empty the full bath in 10 minutes. All three are fully open for 2 minutes,after which the waste-pipe is closed. How much longer will it take to fill the bath?
Penny Nom lui répond.
1 + 2 + 3 + ... + (2n - 1) 2015-01-01
Brian pose la question :
Hi Maths Central
My wife presented me with a query which may have a simple answer, but one that I can’t deduce or explain.

Take the string of numbers, n=1,2,3,4,5…
It seems that n(2n-1) = Sum((1…..(2n-1))
e.g. for n=5, both 5 x 9 and Sum(1….9) equal 45, and so on for other values of n.

Could you please provide an explanation? Does it have an underlying reason and a name?

Look forward to your response.
Brian

Penny Nom lui répond.
An isosceles triangle 2014-12-31
ahmadmahmoud pose la question :
an isoseles triangle is such that each of the base angles is twice the vertical angle.Find the angles of the triangle
Penny Nom lui répond.
1.5% of 1 trillion 2014-12-30
Kgosi pose la question :
How much is 1.5% of 1 trillion?
Penny Nom lui répond.
Rates, percentages and units 2014-12-30
Kenneth pose la question :
Hello:

If percentages have no units, why are some percentages called rates, as in interest rate, or perhaps a tax rate of 7% as an example? A rate has units of different quantities.

I thank you for your reply.

Robert Dawson lui répond.
Curvature of the Earth 2014-12-29
Jimmy pose la question :
Both batteries died in my scientific calculator and I have lost my formula for the heigth of the curvature of the earth between two points on the surface. I used degrees and miles. I only had to enter the distance between the two points on the surface and the formula gave me the hieght the earth raised between the two points.
Robert Dawson lui répond.
196 kilometer in2 hours 2014-12-29
Ekanem pose la question :
QQ A motorist had planned to reach a place 196km in two hrs exactly. For the first 15km he was able to average only 40km/h. What average speed must he keep up for the rest of the journey if he is to arrive on time.
Penny Nom lui répond.
The perimeter of a quarter circle 2014-12-26
Maisy pose la question :
This is the question that I got for a math worksheet.
The radius of a quarter circle is 5 miles. What is the quarter circle's perimeter?
Use 3.14 for pi.

Penny Nom lui répond.
A trip to Ottawa from Toronto 2014-12-22
Kristy pose la question :
A trip to Ottawa from Toronto will take 4 1/2 hours. Assuming we are 2/3 the way there, how much longer will the trip take?
Penny Nom lui répond.
A tangent to a circle 2014-12-22
azman pose la question :
Find the equation of the tangent line to the circle x^2+y^2=9 at the point P (2, square root of 5).
Penny Nom lui répond.
Discount 2014-12-20
nirmala pose la question :
A bag is marked at rs 800 and is sold for rs 68. Find the rate of discount
Penny Nom lui répond.
211basex=152base8 2014-12-15
Humaira pose la question :
211basex=152base8
Penny Nom lui répond.
A line segment of length root 5 2014-12-15
angela pose la question :
On the dot grid below, draw and label a line segment with length square root 5 the dot grid is 8 by 10
Penny Nom lui répond.
 
Page
96/886

 

 


Centrale des maths reçoit une aide financière de l’Université de Regina et de The Pacific Institute for the Mathematical Sciences.

CMS
.

 

accueil centre de ressources accueil Société mathématique du Canada l'Université de Regina PIMS