This is a TI-84 activity that uses Mathematical Modeling and Climate Change data. Here is where you can get the data for a TI-84 or TI-84 CE: LEDCOST program. You can get the student sheet here: LED Lighting Cost Student and the teacher notes and solutions here: LED Lighting Cost Teacher. Or you can get all 3 files in a zip folder here: LED Lighting Cost All Files.

I will be giving a week-long course at Exeter Academy this summer that will illustrate many activities like this one. If you are interested, check out session 32 at this link: https://exeter.edu/sites/default/files/media/MathCourses2019%20Updated.pdf

Student pdf:

LED01

LED02

Teacher pdf

LED03

LED04

LED05

LED06

LED07

LED08