1 Exercis 2, page 5

1.1 problem 2(a)
1.2 problem 2(b)
1.3 problem 2(c)
1.4 problem 2(d)
1.5 problem 2(e)
1.6 problem 2(a)
1.7 problem 3(a)
1.8 problem 3(b)
1.9 problem 3(c)
1.10 problem 3(d)
1.11 problem 3(e)
1.12 problem 3(f)
1.13 problem 3(g)
1.14 problem 3(h)
1.15 problem 3(i)