Your test is **tomorrow, Friday the 24th!** Remember that there will be a calculator portion and a no-calculator portion to this test.

Your last review assignment can be found here: HW 9.21 – Test Review 3. The answers to all three review assignments can be found here: Unit 9 Test Review Answers.

## Lesson Video Archive

**Part 1 – Simplifying Exponential Expressions****Part 2 – Exponential Modeling and Compound Interest**- Review of percent change problems from Algebra 1
- Setting up an exponential function equation to solve for the base
- Using the compound interest formula (the video’s notation is a little different from ours, but the method is the same)
- Finding the starting value for a compound interest problem
- Compounding continuously (this video starts at 14:30, and the relevant portion ends at 18:15, but watch the first 14 minutes for some more examples of compound interest questions!)

**Part 3 – Linear and Exponential Regression**