Use the links below for more examples.
http://www.youtube.com/watch?v=vOTTuZflAIM
http://www.youtube.com/watch?v=HHeYsgNzKeE
http://www.youtube.com/watch?v=oy-x-xGWAf4
http://www.youtube.com/watch?v=DO2NHtTG0TM
http://www.khanacademy.org/math/calculus/derivative_applications/critical_points_graphing/v/calculus--graphing-using-derivatives
Homework: book assignment 3.6