Sec.4.7.4, p. 192; problems: #20, 31, 52, 65 Sec.4.4.4, p. 172; problems: #50, 74, 78 Sec.4.10, p. 198; problems: #6, 8, 30 (reveiw problems)
Sec.4.7.4, p. 233; problems: #20, 31, 52, 65 Sec.4.4.4, p. 208; problems: #50, 74, 78 Sec.4.10, p. 243; problems: #6, 8, 30 (reveiw problems)