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)