While you are a student at BYU-Idaho, Mathematica is free to download and use. Please follow the instructions below to access your free download.
User ID Creation
If you have not already installed it from a previous class, head to Wolfram and create a user ID using your byui.edu email address.
Download Link
After creating your account (and possibly a brief verification window), you should be able to download Mathematica for free:
Video Tutorial
Watch a short video about installing and using Mathematica for the first time.
Other Options for Accessing Mathematica
If you can't install and use Mathematica on your laptop, more options are described here.