 |
|
|
|
|
|
|
|
|
A combination question |
2005-01-26 |
|
Kelly pose la question :
A computer with an old processor locks up if more than 4 applications are running at the same time. If the owner has 20 applications stored in his program file, how many different sets of 4 can he run, so that his computer does not lock up?
Penny Nom lui répond. |
|
|
|
|
|
|
un nombre entier |
2005-01-25 |
|
Un eleve pose la question :
comment démontrer qu un nombre entier est un carré parfait si et seulement si il admet un nombre impair de diviseurs?
Claude Tardif lui répond. |
|
|
|
|
|
|
Three tangent circles |
2005-01-25 |
|
Kate pose la question :
Two circles, C1 and C2, touch each other externally; and the line l is a common tangent. The line m is parallel to l and touches the two circls C1 and C3. The three circles are mutually tangent. If the radius of C2 is 9 and if the radius of C3 is 4, what is the radius of C1?
Chris Fisher lui répond. |
|
|
|
|
|
|
il y a 1/6 de voitures bleues, |
2005-01-24 |
|
Facrice pose la question :
il y a 1/6 de voitures bleues, 2/9 de voitures rouges, 5/12 de voitures blanches et 1/8 de voitures vertes. Sachant que 15 voitures sont d'une autre couleur. Combien y a t il de voitures de chaque couleur.
Claude Tardif lui répond. |
|
|
|
|
|
|
Differentiating F(x,y) = 0 |
2005-01-23 |
|
Jacob pose la question :
In calculus, we often mention to the students that if F(x,y) = 0, then we can differentiate both sides and still get an equality. The problem is that we can't perform the same operation on F(x) = 0, say x = 0, otherwise 1 = 0, which is absurd. What is the reason?
Walyer Whileley and Harley Weston lui répond. |
|
|
|
|
|
|
cos 2x = sin x |
2005-01-22 |
|
Kris pose la question :
solve the equation
cos 2x = sin x for 0<= x < 360
Penny Nom lui répond. |
|
|
|
|
|
|
When dividing a 3-digit number by a 1-digit number... |
2005-01-22 |
|
A student pose la question :
When dividing a 3-digit number by a 1-digit number, for what divisors can you get a remainder of 8?
Penny Nom lui répond. |
|
|
|
|
|
|
The diameter of a 800 km circle |
2005-01-22 |
|
Mechelle pose la question :
What is the diameter of a 800 km circle?
Penny Nom lui répond. |
|
|
|
|
|
|
A 6 sided (hexagonal) pyramid |
2005-01-22 |
|
Steve pose la question :
im trying to make a 6 sided (hexagon) pyramid, from 6 triangles of 12mm plywood, i know all the angles to cut apart from the one one to join all 6 triangles together. Rough measurements are outer edge (A) of each triangle is 13cm's, length of other 2 sides (B&C) of triangle outside to center is 14cm's with a height of the whole thing together about 6cm's.
Chris Fisher and Harley Weston lui répond. |
|
|
|
|
|
|
The area of a triangle |
2005-01-21 |
|
Amy pose la question :
In tirangle ABC, AB=6, BC=9, BC is the angle bisector of angle ABC and M is the midpoint of BD. If the area of ABC is 30, what is the area of ABM?
The height comes out greater than the hypotenuse, but the teacher said that there's an answer for it. Can you show me how? Thanks
Chris Fisher lui répond. |
|
|
|
|
|
|
Finding the missing side of a triangle |
2005-01-20 |
|
Jason pose la question :
I found a geometry problem that reads as follows:In triangle ABC,
Penny Nom lui répond. |
|
|
|
|
|
|
The angle between two forces |
2005-01-19 |
|
Abraham pose la question :
One 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.
Penny Nom lui répond. |
|
|
|
|
|
|
The radius of a circle |
2005-01-18 |
|
A student pose la question :
find the radius of a circle whose area is 1256sq cm.Use pi as an appoximation for pi.
Penny Nom lui répond. |
|
|
|
|
|
|
A non-rerctangular lot |
2005-01-18 |
|
EM pose la question :
One corner of a 60X120 foot lot, otherwise rectangular, is a curve with a radius of 20 feet and a central angle of 90 degrees. What is the area?
Penny Nom lui répond. |
|
|
|
|
|
|
The side of a cube |
2005-01-17 |
|
Jake pose la question :
I have one for you that's got me stumped. Is it possible to calculate the dimensions of a square if I have the cubic feet? Say I know the package to be 180 cubic feet.
Penny Nom lui répond. |
|
|
