## Section 2 Calculating and Graphing Tools

It might be useful to have an ability to do some calculations and draw graphs. The traditional recommendation is a Texas Instruments TI-84 hand-calculator, but I prefer various choices of free "calculating tools" available as websites, phone apps and computer software, and so will demonstrate some of them. One of my favorites is the Desmos Graphing Calculator

^{ 1 }; in addition to that website interface, this is available as a free app for iPhones, iPads^{ 2 }, and Android^{ 3 }devices.Such tools may be used for some homework and in-class exercises, but not on tests or the final exam.

`www.desmos.com/calculator/`

`apps.apple.com/us/app/desmos-graphing-calculator/id653517540`

`play.google.com/store/apps/details?id=com.desmos.calculator`

`www.desmos.com`