2.1 2.4, page 55

2.1.1 Problem 1
2.1.2 Problem 2
2.1.3 Problem 3
2.1.4 Problem 4
2.1.5 Problem 5
2.1.6 Problem 6
2.1.7 Problem 7
2.1.8 Problem 8
2.1.9 Problem 9
2.1.10 Problem 10