.
. 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
176/886
A quartic polynomial that is a perfect square 2012-02-05
archit pose la question :
If P(x)=x^4+ax^3+bx^2-8x+1 is a perfect square then (a+b)=?
Penny Nom lui répond.
Two sectors of a circle 2012-02-03
Wayne pose la question :
I am not even sure what to ask. I have to two lengths of feet and an angle of degrees, and I have to find the area?
**Problem attached

Thanks,
Wayne

Penny Nom lui répond.
A rectangular block and a sphere 2012-02-02
snehal pose la question :
a solid rectangular block of metal 49 cm. by 44cm. 18cm. is melted and formed into a solid sphere, find the radius of the sphere[22/7]
Penny Nom lui répond.
There is a police officer in pursuit of suspect 2012-02-01
Jay pose la question :
There is a police officer in pursuit of suspect. They suspect is driving on a straight road traveling at 79 mph, the officer is 233 yds away, traveling at 92 mph, the suspects car 5 ft long and the officers car is 5.3 ft long, how long will it take to have the front of the officers car, equal to the front of the suspects car down to the tenth of a second.
Harley Weston lui répond.
If a parallelogram is a cyclic quadrilateral then it is a rectangle 2012-02-01
Kim pose la question :
Show that if a parallelogram is a cyclic quadrilateral then it is a rectangle. Hint: Observe that in a parallelogram ABCD we always have Triangle ABC is congruent to Triangle CDA.
Robert Dawson and Chris Fisher lui répond.
Properties of real numbers applied to subsets 2012-02-01
Mark pose la question :
Hello - The questions that I have for you is do the properties of real numbers (such as the associative, commutative, identity, inverse, and distributive law) apply to ALL the subsets of real numbers? In other words, do all those properties work for the Natural Numbers? The Whole Numbers? And so on and so forth. I understand that they are all real numbers, but for instance: the identity is whenever you add zero to a number, you get that number back. But does that work with, say, with only the odd numbers? Zero isn't odd so can that property actually apply to JUST the odd numbers? Any consideration would be greatly appreciated!
Robert Dawson 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.
Two cars in a race 2012-01-30
Christine pose la question :
In a car race, the speed of one car is 120kph and the other car is 105 kph. If the faster car finished the race 20 mins before the slower one, what was the distance of the race? Thanks for the answer and the previous answer to my question.
Penny Nom lui répond.
A two digit number 2012-01-29
Christine pose la question :
Five times the sum of the digits of a two digit number equals the number. If the digits are reversed, it becomes nine more than the original number. What is the original number? I really don't understand this question, help me please
Penny Nom lui répond.
Building a tipi 2012-01-29
Lacy pose la question :
Hi there! We are building a tipi for our children. We want to build a large one about 15ft tall with a base of about 15 feet diameter. I am trying to figure out how much canvas we need to accomplish this. I graduated about 20 years ago and am struggling. Please help if you can.
Penny Nom lui répond.
The volume of a dugout 2012-01-28
Jan pose la question :
is there a formula for calculating the cubic yardage removed from a dugout for example that is forty feet wide by one hundred and twenty feet long by twelve feet deep with a three to one slope? It is the slope that makes it a little tricky. Thank you.
Penny Nom lui répond.
Tons of fill dirt 2012-01-27
Brian pose la question :
about how many tons of fill dirt would I need to level a area 30 foot by 30 foot and 6 foot deep
Penny Nom lui répond.
The area of a triangle 2012-01-27
mary pose la question :
I have a scalene triangle and the base is 33m, side is 52m and the unparallel side is 25m but i drew a dotted line down and that s 20m

how do i figure the area?

thanks

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.
I need to make a 45,000 pound batch of this 80% MgO product 2012-01-26
James pose la question :
I have a 55% MgO product and 89% MgO product. I have unlimited pounds of each MgO product. I am looking to make a 80% MgO product. I need to make a 45,000 pound batch of this 80% MgO product.
Penny Nom lui répond.
 
Page
176/886

 

 


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