85.18 Chapter two. First order and simple higher order ordinary differential equations. A Exercises at page 52

85.18.1 problem 1 (a)
85.18.2 problem 1 (b)
85.18.3 problem 1 (c)
85.18.4 problem 1 (d)
85.18.5 problem 1 (e)
85.18.6 problem 1 (f)
85.18.7 problem 1 (g)
85.18.8 problem 1 (h)
85.18.9 problem 1 (i)
85.18.10 problem 1 (j)
85.18.11 problem 2