2 Chapter 3. Some basics about First order equations. Additional exercises. page 63

2.1 problem 3.4 a
2.2 problem 3.4 b
2.3 problem 3.4 c
2.4 problem 3.4 d
2.5 problem 3.4 e
2.6 problem 3.4 f
2.7 problem 3.4 g
2.8 problem 3.4 h
2.9 problem 3.4 i
2.10 problem 3.4 j
2.11 problem 3.6