4.4 Section 2.5. Page 88

4.4.1 problem 1
4.4.2 problem 3
4.4.3 problem 4
4.4.4 problem 5
4.4.5 problem 6
4.4.6 problem 7
4.4.7 problem 9
4.4.8 problem 10
4.4.9 problem 11
4.4.10 problem 12
4.4.11 problem 13