9.1 problem 1(a)
9.2 problem 1(b)
9.3 problem 1(c)
9.4 problem 1(d)
9.5 problem 1(e)
9.6 problem 1(f)
9.7 problem 1(g)
9.8 problem 1(h)
9.9 problem 1(i)
9.10 problem 1(j)
9.11 problem 1(k)
9.12 problem 1(L)
9.13 problem 2(a)
9.14 problem 2(b)
9.15 problem 2(c)
9.16 problem 2(d)
9.17 problem 2(e)
9.18 problem 2(g)
9.19 problem 2(h)
9.20 problem 3
9.21 problem 4
9.22 problem 5
9.23 problem 6