Sec.5.7, p. 266; problems: #1, 2, 3, 5
Sec.5.3, p. 2235; problems: #2, 10, 12, 14, 22, 24
Sec.5.7.1, p. 324; problems: #1, 2, 3, 5 Sec.5.3.4, p. 287; problems: #2, 10, 12, 14, 22, 24