Diagram

In the given diagram, what is the value of x ?

A. 20o

B. 60o

C. 80o

D. 100o

E. 120o

Answer ?

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October 25, 2010 | Filed Under Mathematics | 8 Comments 

Canadian Open Mathematics Challenge 2007

Problem:

1. If a = 15 and b = -9, what is the value of a2 + 2ab + b2 ?
2. A circular wind power generator turns at a rate of 30 complete revolutions per
minute. Through how many degrees does it turn in one second ?

Solution ?
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October 23, 2010 | Filed Under MathforOlympiad | Leave a Comment 

Mathematics Challenge

Problem:
1. If 2x + y = 13 and x + 2y = 11, what is the value of x + y?
2. Determine the units digit of the integer equal to 9 + 92 + 93 + 94.
(The units digit of an integer is its rightmost digit. For example, the units digit of
the integer 1234 is 4.)

Answer ?
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October 22, 2010 | Filed Under MathforOlympiad | 1 Comment 

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