20.3 Chapter 2, section 10, page 47

20.3.1 problem 2(a)
20.3.2 problem 2(b)
20.3.3 problem 2(c)
20.3.4 problem 4(a)
20.3.5 problem 4(b)
20.3.6 problem 4(c)
20.3.7 problem 4(d)
20.3.8 problem 4(e)