Polynomials: Add/Subtract, Multiply, Factor (Butt Cheeking), Solve for roots in factored form, Vertical Motion Model,

Complex numbers and their coolness (how they are applied)

Website #1
(This website is awesome. It breaks down complex numbers and how their complexity is useful.)

Website #2
( A Visual, Intuitive Guide to Imaginary Numbers. Excellent site.)

Wesbite #3 
(Very boring, but shows how other math is tied in and how much of a foundation you really need.)

Website #4 
(Shows direct link to circuits.)