86.11 Chapter 9. The operational method. Exercise 9c at page 137

86.11.1 problem 1
86.11.2 problem 2
86.11.3 problem 3
86.11.4 problem 4
86.11.5 problem 5
86.11.6 problem 6
86.11.7 problem 7 (a)
86.11.8 problem 7 (b)
86.11.9 problem 9
86.11.10 problem 10 (a)
86.11.11 problem 10 (b)
86.11.12 problem 11 (a)
86.11.13 problem 11 (b)