(25 points) Chapter 16, number 1

(25 points) Chapter 16, number 2

(25 points) Chapter 16, number 4

(25 points) Chapter 17, number 2

(15 points) Chapter 17, number 10

(10 points) Chapter 18, number 1

(20 points) Chapter 18, number 3

Extra credit: 18.4, 18.5, 17.8, 17.9, 16.6