Section	Exercises
12.7	p.837: 1, 3, 7, 9, 13, 15, 21, 25, 29, 30, 43, 51
13.1-13.2	p.857: 7, 11, 15, 25, 27, 29, 34, 37, 39, 41, 43, 53-58
13.3	p.866: 5, 13, 24, 27, 30, 43, 45, 51