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The Largest Factor |
1998-03-15 |
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From Senthuran Nadarajah:
When each expression is evaluated for different values of n, the answers will differ. For each expression, find largest natural number that will divide the result for all natural number values of n. n^5 - 5n^3 + 4n
Answered by Harley Weston. |
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Matrices |
1998-03-10 |
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From Ksya:
- A and B are matrices. If A^n=B^n, can we say A=B or det(A)=det(B) or det(A)^n=det(B)^n ? Any conditions ???
- If B^(-1) is the inverse of B, where B is a matrices. Can we say [(B^(-1))^n][B^n]=I, where I is identity matrices? Any conditions???
Answered by Doug Farenick. |
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Clock Arithmetic. |
1998-03-09 |
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From Joann Dixon:
What is clock mathematics?
Answered by Patrick Maidorn. |
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Area of a Triangle. |
1998-03-05 |
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From Amanda:
How do you figure out the area of a triangle? You already have the perimeter and height
Answered by Penny Nom. |
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Y-intercept |
1998-02-27 |
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From Don Trumpet:
What is the Y-intercept for the problem:Y = -2(x+2) + 9
Answered by Harley Weston. |
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Pay Phone Problem |
1998-02-26 |
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From Shameq:
Hi, I've been given a problem that I'm having some trouble with. I'd really appreciate any help. Here's the question (it's called the Pay Phone Problem) A pay phone will take only 10p, 20p, 50p, and £1 coins"(It's British). A woman has plenty of 10p and 20p coins. She has no other coins. She can put the coins into the pay phone in any order. INVESTIGATE the number of different ways, she could put the 10p and 20p coins into the pay phone.
Answered by Penny Nom. |
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The origin of angles |
1998-02-24 |
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From Marc Poulin:
I'm currently teaching angles to students in grade 10 and I've been asked what's the origin of the terms degrees, radians and gradians. I know that the radians come from the sexagesimal numerical system of the Babylonians but my kids wanted to know dates and persons who would have brought these terms first.
Answered by Harley Weston. |
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Tessellations of non-polygons |
1998-02-24 |
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From Ellen Goldwasser:
Hi! My name is Ellen Goldwasser. I'm a seventh grade student and I'm doing a prodject on tessellation. My question is: why will certain shapes (not polygons) tessellate? Thanks for your help!
Answered by Penny Nom. |
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Tangrams |
1998-02-24 |
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From Allison:
Do you know the story behind the tangram? I know that it is a Chinese puzzle about 200 years old. If there is a story about its creation, I would love to share it with my 7th graders. Thanks.
Answered by Diane Hanson and Penny Nom. |
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(50^20)(20^50) |
1998-02-24 |
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From fion:
50 power of 20 X 20 power of 50? How many zero can be found in the answer and why?
Answered by Penny Nom. |
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les fractions |
1998-02-24 |
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From Colette Huguenin:
Bonjour je révise mes math de tout les secondaire et le livre louer la bibliothèque n'est pas entier voici le genre de problêmes qui me bloque (5 4/5+1/2)divisé 1/3 je sais que je dois commencer par la parenthèse mais...je fait quoi comme opération avec le 5? dois-je le multiplier ou l'additionner ou.......????? si je pouvais seulement avoir la base des fractions je redébloquerais surement
Answered by Diane Hanson. |
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x^2 = ...444 |
1998-02-23 |
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From James Bauer:
What is the first interger that when squared ends in three 4's? (ex. x^2 = ...444) Prove that there are no intergers that when squared end in four 4's (ex. x^2 = ...4444)
Answered by Penny Nom. |
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A Tightrope Walker. |
1998-02-19 |
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From Amy Zitron:
A tightrope is stretched 30 feet above the ground between the Jay and the Tee buildings, which are 50 feet apart. A tightrope walker, walking at a constant rate of 2 feet per second from point A to point B, is illuminated by a spotlight 70 feet above point A....
Answered by Harley Weston. |
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The sum of the angles of a triangle is 180 degrees |
1998-02-19 |
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From Quin Liu:
How do you prove that the sum of the angles of a triangle is 180 degrees? Is there a proof? what is it?
Answered by Chris Fisher. |
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Graph Distortion |
1998-02-19 |
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From Dana Steffan:
What exactly is graph distortion? I have to explain it for a project and I can't seem to find anything on it.
Answered by Penny Nom. |
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