5th hour started discussing the disk method. 7th hour did not (had 6 students at ACT boot camp).
Homework: Watch the video links below
http://www.khanacademy.org/math/integral-calculus/solid_revolution_topic/disc-method/v/disk-method-around-x-axis
http://www.khanacademy.org/math/integral-calculus/solid_revolution_topic/disc-method/v/generalizing-disc-method-around-x-axis
http://www.khanacademy.org/math/calculus/solid_revolution_topic/solid_of_revolution/v/solid-of-revolution--part-1