In this project, students use what they have learned about exponential functions to explore depreciation on a car of their choice. They demonstrate that they understand the exponential decay function and the associated graph and table and they explain how they derived their answers. This is a project that I have used with my students for several years, first on TI-83+ handhelds and now on TI-NSpires.
The .zip file includes two .tns files: a completed student project (thanks, Sierra, for letting me use it!) and a template for your students to use to complete the project, as well as a copy of the preview document.