85.24 Chapter two. First order and simple higher order ordinary differential equations. A Exercises at page 57

85.24.1 problem 1
85.24.2 problem 2
85.24.3 problem 3
85.24.4 problem 4
85.24.5 problem 5
85.24.6 problem 6
85.24.7 problem 7
85.24.8 problem 8