Once here, select "Math Tools" at the top.
Then choose which calculator you want to use.
Note: The graphing and scientic calculators are the ones available to you on the End of Course Test (EOC).
Khan Academy has many video tutorials you can view if you need more assistance with a particular concept.
CALCULATOR APPS:
For Android phones:
You can download Wabbitemu from the app store for a free version that is similar to the TI 84 Plus graphing calculator.
For iPhones:
You can download Calculate84 from the Apple Store for a free version that is similar to the TI 84 Plus graphing calculator.