P1. (10 points) Problem 7.1
P2. (10 points) Problem 7.2
P3. (10 points) Problem 7.7
P4. (10 points) Problem 7.9
P5. (10 points) Problem 7.11
P6. (10 points) Problem 7.13
P7. (10 points) Problem 7.14
P8. (10 points) Problem 7.17.
P9. (10 points) Problem 7.18
P10. (10 points) Problem 7.22
P11. (10 points) Problem 7.25
P12. (10 points) Problem 7.27
P13. (10 points) Problem 7.29
P14. (10 points) Problem 7.32
P15. (10 points) Problem 7.35