|
|
|
|
|
|
|
|
5 points équidistants sur la surface d' une sphère |
2005-08-15 |
|
Jean pose la question : J' aimerais placer 5 points équidistants sur la surface d' une sphère.
Si vous aviez une formule simple pour un néophyte, cela m' aiderais beaucoup. Claude Tardif lui répond. |
|
|
|
|
|
Jim is travelling from Toronto to Ottawa |
2005-08-15 |
|
Eleanor pose la question : Hi! I am looking for an easy way to solve this type of question: Jim is travelling from Toronto to Ottawa, a distance of 435 miles. He travels part of the way at a speed of 100 km/h and because of an accident, he uses a secondary road and travels at 70 km/h. If the trip took him 6.5 hours, how far did he travel on each of the two roads. Penny Nom lui répond. |
|
|
|
|
|
Is 360 Really the correct value? |
2005-08-15 |
|
Jack pose la question : Considering the circumference of a "Perfect Circle" with a Diameter of 1 meter would be something like 3.14 meters, why do we use the number 360 to represent the number of degrees within that circumference?
Would it not make more sense to express the degrees in reference to the relationship to the diameter as related to pi?
That is, let's just say our "Perfect Circle" has a circumference of 3.14 meters, therefore, what we now consider as due east would change from 90 Degrees to 78.5 Degrees. Penny Nom lui répond. |
|
|
|
|
|
Stock in a printing company |
2005-08-12 |
|
Tracy pose la question : Sam and Mary each owned one-half stock in a printing company. Sam sold 2/3 of his stock to Mary. What fractional part of the printing business does Mary now own? Penny Nom lui répond. |
|
|
|
|
|
Framing an arched wall |
2005-08-12 |
|
Mike pose la question : I'm framing a building wall with a curved (arcing) top section. The radius of the section is 74'6" with a height above finish floor of 16'0". The horizontal run of the arced section is 23' 1 1/2" with a low height above finish floor of 12'4". If I start with a 16' stud at the high end how long are the subsequent studs if they are on 16" centers? Short of laying this out on a tennis court how can I work out the lengths of the studs? Penny Nom lui répond. |
|
|
|
|
|
A triangular lot |
2005-08-10 |
|
Elizabeth pose la question : If a piece of property was 100 ft on the west, 133 ft on the east and 100 on the north, how many acres is this or what fraction of an acre is this property? Penny Nom lui répond. |
|
|
|
|
|
The Maclaurin series generated by f(x)=x^ cosx + 1 |
2005-08-10 |
|
Latto pose la question : f(x)=x3·cosx + 1. but when I take the derivatives, I couldn't see a pattern. Can you help?
Penny Nom lui répond. |
|
|
|
|
|
Proof by induction? |
2005-08-10 |
|
Peter pose la question :
I am a lecturer and am having a problem with the following Proof by
Induction.
If
(N x N x N x N) + (4 x N x N x N) + (3 x N x N) + (N) = -4000
Prove that N is even!
Chris Fisher and Penny Nom lui répond. |
|
|
|
|
|
The volume of soil needed to fill a planter |
2005-08-10 |
|
Phil pose la question : I need to calculate the volume of soil needed to fill a planter box that measures - 880mm W x 6080mm L x 900mm D. Penny Nom lui répond. |
|
|
|
|
|
Cubic feet |
2005-08-10 |
|
Selene pose la question : This is my math question I need to convert these inches to cubic feet
34"W x 34"H x 34"L Penny Nom lui répond. |
|
|
|
|
|
The number of four digit combinations |
2005-08-09 |
|
Kevin pose la question : My 12 year old has asked me how to figure out the number of four digit combinations possible using 0 thru 9 without repeating a number? Penny lui répond. |
|
|
|
|
|
how do i round up 9.6 to the nears ones |
2005-08-09 |
|
Carlos pose la question : how do i round up 9.6 to the nears ones Penny Nom lui répond. |
|
|
|
|
|
A two digit number |
2005-08-09 |
|
Grace pose la question : I am a 2 digit number. Both of my digits are even. My tens digit is 8 more than my ones digit. What number am I? Penny Nom lui répond. |
|
|
|
|
|
Constructing a fence |
2005-08-09 |
|
Andres pose la question : I was constructing my fence and was having some problems trying to do a perfect (or as close as possible) arch. If i know a section of a fence is for example 85 inches wide and I want a 4 inch rise from the top rail how do i figure out the radius? Penny Nom lui répond. |
|
|
|
|
|
At what rate is the circumference of the circle increasing? |
2005-08-08 |
|
John pose la question :
A mathematics professor is knitting a sweater. The main part of the sweater is knit in a large spiral, ending up with a diameter of 30 inches. She knits at a constant rate of 6/7 square inches per minute.
1. At what rate is the circumference of the circle increasing when the diameter is 2 inches?
2. How long will it take her to finish this piece of the sweater?
Penny Nom lui répond. |
|
|