8.1 problem 13.1 (a)
8.2 problem 13.1 (b)
8.3 problem 13.1 (c)
8.4 problem 13.1 (d)
8.5 problem 13.1 (e)
8.6 problem 13.1 (f)
8.7 problem 13.2 (a)
8.8 problem 13.2 (b)
8.9 problem 13.2 (c)
8.10 problem 13.2 (d)
8.11 problem 13.2 (e)
8.12 problem 13.2 (f)
8.13 problem 13.2 (g)
8.14 problem 13.2 (h)
8.15 problem 13.2 (i)
8.16 problem 13.3 (a)
8.17 problem 13.3 (b)
8.18 problem 13.3 (c)
8.19 problem 13.3 (d)
8.20 problem 13.4 (a)
8.21 problem 13.4 (b)
8.22 problem 13.4 (c)
8.23 problem 13.4 (d)
8.24 problem 13.4 (e)
8.25 problem 13.4 (f)
8.26 problem 13.5 (a)
8.27 problem 13.5 (c)
8.28 problem 13.5 (d)
8.29 problem 13.5 (e)
8.30 problem 13.5 (f)
8.31 problem 13.5 (g)
8.32 problem 13.5 (h)
8.33 problem 13.5 (i)
8.34 problem 13.5 (j)
8.35 problem 13.6 (a)
8.36 problem 13.6 (b)
8.37 problem 13.6 (c)
8.38 problem 13.6 (d)
8.39 problem 13.6 (e)
8.40 problem 13.6 (f)
8.41 problem 13.6 (g)
8.42 problem 13.6 (h)
8.43 problem 13.7 (c)
8.44 problem 13.7 (d)
8.45 problem 13.7 (e)
8.46 problem 13.8 (i)
8.47 problem 13.8 (ii)
8.48 problem 13.8 (iii)
8.49 problem 13.8 (iv)
8.50 problem 13.9 (i)
8.51 problem 13.9 (ii)
8.52 problem 13.9 (iii)
8.53 problem 13.9 (iv)