16.1 Exercis 2, page 5

16.1.1 problem 2(a)
16.1.2 problem 2(b)
16.1.3 problem 2(c)
16.1.4 problem 2(d)
16.1.5 problem 2(e)
16.1.6 problem 2(a)
16.1.7 problem 3(a)
16.1.8 problem 3(b)
16.1.9 problem 3(c)
16.1.10 problem 3(d)
16.1.11 problem 3(e)
16.1.12 problem 3(f)
16.1.13 problem 3(g)
16.1.14 problem 3(h)
16.1.15 problem 3(i)