3 Chapter 4

 3.1 problem 2
 3.2 problem 4
 3.3 problem 5.1
 3.4 problem 5.2
 3.5 problem 5.3
 3.6 problem 5.4
 3.7 problem 5.4
 3.8 problem 7.1
 3.9 problem 7.1