HW3: Due Nov 20.

1. Chapter 9: 9.1, 9.4, 9.6.
   
2. Chapter 11: 11.1, 11.4,
   
3. Chapter 12: 12.2, 12.6.
   
4. Chapter 13: 13.1, 13.4, 13.5, 13.8, 13.14.