Answers to Practice Exam 3

1. (a) $1610.32 (b) $1616.07

2. (a) 1 (b) -1 (c) x + 4 (d) 0 (e) ½

3. log₃((x + 1)y⁵/25)

4. 1.9206

5. (a) x = 0.0794 (b) x = 105

6. (a) 615 bacteria (b) t = 3.66 hours

7. (a) n(t) = 400e^-0.1189t (b) 5.83 days