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Adding consecutive numbers |
2006-04-26 |
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Lisa pose la question :
When I have a total that is the sum of consecutive numbers, how do I figure out what the numbers are?
Stephen La Rocque lui répond. |
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What defines a pyramid? |
2006-04-25 |
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Julie and son pose la question :
My son and I think that a pyramid can have any number of sides, but my son's teacher says a pyramid has just 4 sides (including the base). Who's right?
Stephen La Rocque lui répond. |
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Absolute Value vs. Standard Deviation ? |
2006-04-24 |
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Sonia pose la question :
Why we don't just take the average of the absolute value of difference scores (use the mean deviation) to describe variability instead of calculating the standard deviation?
Claude Tardif lui répond. |
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How do I find the percentage interest? |
2006-04-24 |
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Cheryl pose la question :
Kiera invested $43,608 in a mutual fund that paid
$432.96 in interest at the end of the year. What was the percent interest Kiera earned from her initial investment?
Stephen La Rocque lui répond. |
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How many gallons in a cubic foot? |
2006-04-24 |
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Jana pose la question :
How many gallons in a cubic foot?
Stephen La Rocque lui répond. |
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Volume d'un cône |
2006-04-24 |
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Christelle pose la question :
Caroline décide de se servir de ses connaissances mathématiques pour "rouler" son petit frère: "Arthur, dit-elle, je te propose que nous mettions chaucun un euro dans l'achat d'un cône glacé. Je mangerai la première, jusqu'à mi-hauteur, et toi, tu auras la seconde moitié."
Combien la part de Caroline représenterai-elle par rapport à celle de son petit frère s'il acceptait ?
Claude Tardif lui répond. |
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Proof by induction |
2006-04-24 |
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Meshaal pose la question :
Find an expression for:
1-3+5 - 7 + 9 - 11 + ... + (-1)^(n-1) * (2n-1)
and prove that it is correct.
Stephen La Rocque lui répond. |
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Geometry proof |
2006-04-23 |
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Jade pose la question :
From a point P outside a circle with centre O, tangents are drawn to meet the circle at A and B.
a) Prove that PO is the right bisector of the chord AB.
b) Prove that
Stephen La Rocque lui répond. |
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Finding the supplementary angles |
2006-04-22 |
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Kendra pose la question :
Angles ABC and DBA are supplementary. If m
Stephen La Rocque lui répond. |
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What's the difference between percentages and points? |
2006-04-21 |
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Sayed pose la question :
What is the difference between percentages and points?
Stephen La Rocque lui répond. |
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The perimeter of a regular octagon |
2006-04-20 |
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Martin pose la question :
I would like to make an octagon out of 2x4 lumber. I know that the lumber needs to be cut at 67.5 degree angles, but how do I determine the length of each piece if I want to make, say, a 2.5 ft diameter octagon?
Stephen La Rocque lui répond. |
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What is the surface area of a cone with a hemisphere on top? |
2006-04-20 |
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Jordan pose la question :
How do you find the surface area of a cone with a hemisphere on top? The only information I have is the radius of the hemisphere, which is 4, and the total height, which is 7.
Stephen La Rocque lui répond. |
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Distance to the horizon |
2006-04-20 |
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Raymond pose la question :
If I stand on the edge of the sea on a beach and look into the horizon, is there a way or formula for calculating the distance from myself to the horizon?
Stephen La Rocque lui répond. |
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Geometric sequence and basic functions (graphs) |
2006-04-20 |
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Marlene pose la question :
Which of the basic functions is related to the geometric sequence:
Linear, Quadratic, Rational, or Exponential?
Can you give me an example of how it would be used in normal life?
Stephen La Rocque lui répond. |
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What is the original cost? |
2006-04-19 |
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Charlie pose la question :
Selling a piece of furniture for $670 and the profit is 35%. What is the original cost?
Stephen La Rocque lui répond. |
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