4 Chapter 8, Ordinary differential equations. Section 4. OTHER METHODS FOR FIRST-ORDER EQUATIONS. page 406

  4.1 problem 1
  4.2 problem 2
  4.3 problem 3
  4.4 problem 4
  4.5 problem 5
  4.6 problem 6
  4.7 problem 7
  4.8 problem 8
  4.9 problem 9
  4.10 problem 10
  4.11 problem 11
  4.12 problem 12
  4.13 problem 13
  4.14 problem 25 part (a)
  4.15 problem 25 part (b)
  4.16 problem 25 part (c)