Use the links below for more examples.
http://www.youtube.com/watch?v=_oS_LjKse38
http://www.youtube.com/watch?v=_wsp2maK0w0
http://www.youtube.com/watch?v=IRWuAoqeeGM
HW: Complete Secret Number Puzzle Curve Sketching #2 and do 1 - 4 in the optimization handout.