85.15 Chapter two. First order and simple higher order ordinary differential equations. A Exercises at page 47

85.15.1 problem 1 (a)
85.15.2 problem 1 (b)
85.15.3 problem 1 (c)
85.15.4 problem 1 (d)
85.15.5 problem 1 (e)
85.15.6 problem 1 (f)
85.15.7 problem 1 (g)
85.15.8 problem 1 (h)
85.15.9 problem 1 (i)
85.15.10 problem 1 (j)
85.15.11 problem 2 (a)
85.15.12 problem 2 (b)
85.15.13 problem 2 (c)
85.15.14 problem 2 (d)
85.15.15 problem 2 (e)
85.15.16 problem 3 (a)
85.15.17 problem 3 (b)
85.15.18 problem 3 (c)
85.15.19 problem 3 (d)