Play a more cerebral countdown using complex numbers.

In this article we shall consider how to solve problems such as "Find all integers that leave a remainder of 1 when divided by 2, 3, and 5."

Draw graphs of the sine and modulus functions and explain the humps.

The family of graphs of x^n + y^n =1 (for even n) includes the circle. Why do the graphs look more and more square as n increases?

This function involves absolute values. To find the slope on the slide use different equations to define the function in different parts of its domain.