Exercises 1.1

33*, 35, 41, 43*, 47*, 49

Exercises 1.2 

 3, 5*

Exercises 1.3

13, 19*, 23, 35*, 41, 61, 65

Exercises 1.4

17, 19*, 37

Exercises 1.5

17, 21*, 25, 37*, 41, 49, 53, 55