Homework should be turned in at the BEGINNING OF CLASS. All problem numbers refer to Tan's book, 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 9.1 **

Problems: 3, 6, 7, 11, 13, 18

**Hint:** Problems #18 requires that you solve two equations (treating C_1
and C_2 as variables) in order to find the particular solution.

** Section 9.2 **

Problems: 2, 5, 10, 14, 19, 23, 26

** Section 9.3 **

Problems: 2, 4, 7, 9, 16

**Note:** These problems require that you come up with a model
differential equation in order to solve them. The example problems from
the section should be helpful.