This is the answer key to the guided notes (located here). If you would like the accompanying worksheet, please purchase bundle (located here). This lesson covers annuities and how to calculate various types of questions about their values, such as Future Value, Present Value, Payments, and Rates using a TVM calculator. This is designed for the Texas high school math class called Math Models with Applications, but it could be used for any teacher trying to teach the math of annuities.