Online Graphing Calculator (there is a free app for the phone if you would like to download)
The PHONE APP WILL NOT be allowed use in the classroom but can be a useful resource when at home.
This site has useful videos to help explain any math concepts from K-12. If you need extra explanantion or cannot remember what we did in notes, search this site.
Login in page for Pre-Calculus/Trigonometry online textbook