31.2 Chapter 10, Differential equations. Section 10.3, ODEs with variable Coefficients. First order. page 315

31.2.1 problem 10.3.2
31.2.2 problem 10.3.3
31.2.3 problem 10.3.4
31.2.4 problem 10.3.5
31.2.5 problem 10.3.6
31.2.6 problem 10.3.7
31.2.7 problem 10.3.8
31.2.8 problem 10.3.9 (a)
31.2.9 problem 10.3.9 (b)