







Euclid's Pythagorean proof 
19960214 

From Sean: What is Euclid's proof of Pythagoras' theorem? Answered by Harley Weston. 





Stairs 
19960212 

From Marianne and Carrie: How many ways can you run up a flight of stairs? Answered by Denis Hanson. 





What is the variance of the difference of two binomials? 
19960208 

From Chris Johnson: My coworkers and I have come up with different estimates of the zstatistic, and are in particular disagreement over the calculation of Variance for this problem. I am trying to find out, with a five percent level of significance, whether the new form yields a higher rate of return than the old form. Any thoughts, comments, or solutions? Answered by Harley Weston. 





Converting to other bases 
19960206 

From Paul: Converting base 10 numbers to other bases Answered by Penny Nom. 





Number of factors 
19960130 

From Chrissy: What number has exactly 13 positive factors? Answered by Penny Nom. 





Trig identities 
19951130 

From Azmat: Why do we work on the two sides of a trig identity separately? Answered by Harley Weston. 





(3)x(2) 
19951025 

From Azmat: Why is (3)x(2) = 6? Answered by Herley Weston and Ed Giesbrecht. 





Complex numbers 
19951022 

From Jacquie: Why should we teach complex numbers in high school? Answered by Harley Weston. 





Magic Square 
19951020 

From Marianne and Carrie: How can an 8 by 8 square have the same area as a 5 by 13 rectangle? Answered by Denis Hanson. 





What is the golden section? 
19950917 

From Cindy: What is the golden section of a line? Answered by Denis Hanson. 

