This exercise was supposed to be due on Monday 18 January, but
since that's Martin Luther King day, you may hand it in on
Wednesday 20 January instead.

1. Stewart, Section 12.3, Exercises 3, 7, 10, 11, 31.

2. Stewart, Section 12.3, Exercises 49, 50, 52, 53.

3. Stewart, Section 12.3, Exercises 58, 68, 79.

4. Stewart, Section 12.3, Exercise 86.
   Note on Exercise 86: Be careful what you keep constant.