Problem 1.22

Problem 2.9

Problem 2.10 Problem 2.13

Problem 3.2 (i), (iii), (iv)

Problem 3.5 (ii), (iv), (iv)

Problem 3.6 (ii) , (iv) Problem 3.12 Problem 3.14 Problem 4.6 (a), ©, (e) Problem 4.11 (a), ©, (e) Problem 4.13 (a), ©, (e)