85.13 Chapter two. First order and simple higher order ordinary differential equations. B Exercises at page 40

85.13.1 problem 1
85.13.2 problem 2
85.13.3 problem 3
85.13.4 problem 4
85.13.5 problem 5
85.13.6 problem 6
85.13.7 problem 7
85.13.8 problem 8
85.13.9 problem 9
85.13.10 problem 10