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The Largest Factor |
1998-03-15 |
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Senthuran Nadarajah pose la question : 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 Harley Weston lui répond. |
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Matrices |
1998-03-10 |
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Ksya pose la question :
- 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???
Doug Farenick lui répond. |
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Clock Arithmetic. |
1998-03-09 |
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Joann Dixon pose la question : What is clock mathematics? Patrick Maidorn lui répond. |
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Area of a Triangle. |
1998-03-05 |
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Amanda pose la question : How do you figure out the area of a triangle? You already have the perimeter and height Penny Nom lui répond. |
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Y-intercept |
1998-02-27 |
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Don Trumpet pose la question : What is the Y-intercept for the problem:Y = -2(x+2) + 9 Harley Weston lui répond. |
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Pay Phone Problem |
1998-02-26 |
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Shameq pose la question : 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. Penny Nom lui répond. |
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The origin of angles |
1998-02-24 |
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Marc Poulin pose la question : 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. Harley Weston lui répond. |
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Tessellations of non-polygons |
1998-02-24 |
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Ellen Goldwasser pose la question : 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! Penny Nom lui répond. |
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Tangrams |
1998-02-24 |
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Allison pose la question : 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. Diane Hanson and Penny Nom lui répond. |
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(50^20)(20^50) |
1998-02-24 |
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fion pose la question : 50 power of 20 X 20 power of 50? How many zero can be found in the answer and why? Penny Nom lui répond. |
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les fractions |
1998-02-24 |
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Colette Huguenin pose la question : 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 Diane Hanson lui répond. |
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x^2 = ...444 |
1998-02-23 |
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James Bauer pose la question : 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) Penny Nom lui répond. |
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A Tightrope Walker. |
1998-02-19 |
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Amy Zitron pose la question : 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.... Harley Weston lui répond. |
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The sum of the angles of a triangle is 180 degrees |
1998-02-19 |
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Quin Liu pose la question : How do you prove that the sum of the angles of a triangle is 180 degrees? Is there a proof? what is it? Chris Fisher lui répond. |
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Graph Distortion |
1998-02-19 |
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Dana Steffan pose la question : What exactly is graph distortion? I have to explain it for a project and I can't seem to find anything on it. Penny Nom lui répond. |
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