2.1 problem 7.3.3
2.2 problem 7.3.4
2.3 problem 7.3.5
2.4 problem 7.3.6
2.5 problem 7.3.7
2.6 problem 7.3.8 (a)
2.7 problem 7.3.8 (b)
2.8 problem 7.3.8 (c)
2.9 problem 7.3.8 (d)
2.10 problem 7.3.8 (e)
2.11 problem 7.3.101 (a)
2.12 problem 7.3.101 (b)
2.13 problem 7.3.101 (c)
2.14 problem 7.3.101 (d)
2.15 problem 7.3.101 (e)
2.16 problem 7.3.102
2.17 problem 7.3.103
2.18 problem 7.3.104 (d)