6 Problem 1.2-1, page 12

 6.1 problem 1.2-1 (a)
 6.2 problem 1.2-1 (b)
 6.3 problem 1.2-1 (c)
 6.4 problem 1.2-1 (d)
 6.5 problem 1.2-1 (e)
 6.6 problem 1.2-1 (f)
 6.7 problem 1.2-1 (g)
 6.8 problem 1.2-1 (h)
 6.9 problem 1.2-1 (i)