Exercises 1.1:  1,  7, 9

Exercises 1.2:   8, 10
 
Exercises 1.3:  1, 3

Exercises 2.1:   1, 3,5

Exercises 2.2:  1, 7, 9

Exercises 2.3:  1,3

Exercises 3.1:  1, 5, 7,9

Exercises 3.2:  3, 5

Exercises 3.3:  3, 5, 7

Exercises 4.1:  7, 9, 11

Exercises 4.2:  1, 3, 7
 
Exercises 5.1:  7, 11

Exercises 5.2:  1, 3, 5, 15

Exercises 7.1: 1,  7,  9

Exercises 7.2:  3, 5,  25, 41

Exercises 7.3:  3, 17,  23, 25

Exercises 7.4:  1, 3, 5, 7, 9

Exercises 7.5:  1, 3, 5, 7, 9, 11

Exercises 8.1: 1, 3, 5, 7, 9

Exercises 8.2:  1, 3, 5, 7, 9, 11

Exercises 9.1:  1, 9, 11, 13

Exercises 9.2:  3, 5, 7, 9, 11, 15