4.1 problem 5.1 (a)
4.2 problem 5.1 (b)
4.3 problem 5.1 (c)
4.4 problem 5.1 (d)
4.5 problem 5.1 (e)
4.6 problem 5.1 (f)
4.7 problem 5.1 (g)
4.8 problem 5.1 (h)
4.9 problem 5.1 (i)
4.10 problem 5.1 (j)
4.11 problem 5.2 (a)
4.12 problem 5.2 (b)
4.13 problem 5.2 (c)
4.14 problem 5.2 (d)
4.15 problem 5.2 (e)
4.16 problem 5.2 (f)
4.17 problem 5.2 (g)
4.18 problem 5.2 (h)
4.19 problem 5.2 (i)
4.20 problem 5.2 (j)
4.21 problem 5.3 (a)
4.22 problem 5.3 (b)
4.23 problem 5.3 (c)
4.24 problem 5.3 (d)
4.25 problem 5.3 (e)
4.26 problem 5.3 (f)
4.27 problem 5.4 (a)
4.28 problem 5.4 (b)
4.29 problem 5.4 (c)