Homework should be turned in at the BEGINNING OF CLASS. All problem numbers refer to McCallum, Hughes-Hallett, et al., the required text for the course. You should write up solutions neatly to all problems, making sure to SHOW ALL YOUR WORK. A nonempty subset will be graded. You are strongly encouraged to work on these problems with other classmates, although the solutions you turn in should be your own work.

**Section 17.3**

Problems: 1, 3, 4, 12, 14, 15, 19, 20

**Hint:** For problems #19 and #20, how do we make sure a vector
has unit length?

**Section 17.4**

Problems: 2, 4, 5, 9

**Note:** Be sure to explain your answers for the matching in #9.

**Section 18.1**

Problems: 1, 2, 3, 4, 14, 15

**Note:** Be sure to explain your answers for each problem!

**Section 18.2**

Problems: 1, 6, 7, 8, 13

**Section 18.3**

Problems: 2, 4, 13, 17, 20, 23

**Section 18.4**

Problems: 2, 4, 5, 8, 9, 11, 16

**Hint:** For problem #16, use Green's Theorem.