16.1 problem 1
16.2 problem 2
16.3 problem 3
16.4 problem 4
16.5 problem 5
16.6 problem 6
16.7 problem 7
16.8 problem 8
16.9 problem 9
16.10 problem 10
16.11 problem 11
16.12 problem 12
16.13 problem 13
16.14 problem 14
16.15 problem 15
16.16 problem 16
16.17 problem 19
16.18 problem 20
16.19 problem 21
16.20 problem 22
16.21 problem 23 (a)
16.22 problem 23 (b)
16.23 problem 24 (a)
16.24 problem 24 (b)
16.25 problem 27 (a)