14 Chapter 2, Second order linear equations. Section 2.5 Higher order equations. Exercises page 130

14.1 problem 1(a)
14.2 problem 1(b)
14.3 problem 1(c)
14.4 problem 1(d)
14.5 problem 1(e)
14.6 problem 1(f)
14.7 problem 2