88.9 Chapter 2. Differential equations of first order. Exercise at page 48

88.9.1 problem 1
88.9.2 problem 2
88.9.3 problem 3
88.9.4 problem 4
88.9.5 problem 5
88.9.6 problem 6
88.9.7 problem 7
88.9.8 problem 8
88.9.9 problem 9
88.9.10 problem 10
88.9.11 problem 11
88.9.12 problem 12
88.9.13 problem 13
88.9.14 problem 14
88.9.15 problem 15