The exam will be on Tuesday, September 28, 1999, from 9:30 am to 10:45 am. It will cover Homework Problems 1 through 22. It consists of five problems, each worth 16 points. More precise information on the various problems follows.

1. Something is decreasing proportionally to something else. Find the corresponding differential equation and solve it. This problem is similar to Homework Problems 10 and 11.

2. Solve an initial value problem involving a first order linear differential equation with nonconstant coefficients. This problem is similar to Homework Problem 14.

3. This is a problem with tanks, water, and dye in the tanks. This problem is very similar to Homework Problem 15. You also will need to solve initial value problems as they occur in Homework Problems 9, 12, and 14.

4. Solve an initial value problem by separating the variables. This problem is similar to Homework Problem 18.

5. This is a problem concerning a certain population. This problem is very similar to Homework Problem 19.