22.1 problem 31.6 (a)
22.2 problem 31.6 (b)
22.3 problem 31.6 (c)
22.4 problem 31.6 (d)
22.5 problem 31.6 (e)
22.6 problem 31.6 (f)
22.7 problem 31.6 (g)
22.8 problem 31.7 (a)
22.9 problem 31.7 (b)
22.10 problem 31.7 (c)
22.11 problem 31.7 (d)
22.12 problem 31.7 (e)
22.13 problem 31.7 (f)
22.14 problem 31.7 (g)
22.15 problem 31.7 (h)
22.16 problem 31.7 (i)
22.17 problem 31.7 (j)
22.18 problem 31.7 (k)
22.19 problem 31.7 (L)