Problems in bold require full solutions! Problems denoted with a * are possible triad questions.

Chapter 19 in Silberberg:

# 19.74, [19.78], *19.86, 19.90, 19.140

Chapter 21 in Silberberg:

# *21.29, [21.48], 21.53, 21.72, 21.109, [21.122]