Practice problems by section: 7.9 #3, 9 8.2 #3, 5, 13 8.4 #5, 9, 17, 18, 21, 35 10.1 #13, 23, 26, 28, 30, 36, 41, 45 10.2 #2, 12, 13, 15, 18, 21, 27, 30, 47