3 Chapter 1. Introduction– Linear equations of First Order. Page 45

 3.1 problem 1(a)
 3.2 problem 1(b)
 3.3 problem 1(c)
 3.4 problem 1(d)
 3.5 problem 1(e)
 3.6 problem 2
 3.7 problem 3
 3.8 problem 8
 3.9 problem 14(a)
 3.10 problem 14(b)
 3.11 problem 14(b)