Absolute Value Functions

Today we learned about Piece - Wise functions. I pretty much understand the idea of how it works. Basically its a function, with more then one rule to it. I missed 2 classes this week due to soccer. Note to self: refrain from doing that anymore. I'm soo far behind now and am slightly panicking at the idea of having a test on this stuff when I barely understand whats going on. So, cross your fingers!