20 Chapter 9 Introduction to Linear Higher Order Equations. Section 9.4. Variation of Parameters for Higher Order Equations. Page 503

 20.1 problem section 9.4, problem 3
 20.2 problem section 9.4, problem 8
 20.3 problem section 9.4, problem 11
 20.4 problem section 9.4, problem 14
 20.5 problem section 9.4, problem 16
 20.6 problem section 9.4, problem 18
 20.7 problem section 9.4, problem 22
 20.8 problem section 9.4, problem 23
 20.9 problem section 9.4, problem 25
 20.10 problem section 9.4, problem 27
 20.11 problem section 9.4, problem 30
 20.12 problem section 9.4, problem 32
 20.13 problem section 9.4, problem 33
 20.14 problem section 9.4, problem 35
 20.15 problem section 9.4, problem 36
 20.16 problem section 9.4, problem 39
 20.17 problem section 9.4, problem 41