Free Online Textbooks, Flashcards, Practice, Real World Examples, Simulations. "CK-12 is appropriate for a diverse group of students who learn in different ways.Teachers can have students progress at their own rates versus one size fits all.
" Jeannie Galindo Supervisor of Educational Technology Manatee County, FL "CK-12 was able to save our department $4,000 in textbook costs this year. Education Portal: Download Wolfram CDF Player. Mathtoons.com. Thenewboston. Math Doctor Bob. PatrickJMT. Free Homework Help Videos from Brightstorm - Math, Science, Test Prep - Brightstorm. Yaymath. Mathwithmrv. All About the Unit Circle Play These videos explain what the unit circle is and how it is used to understand trig functions and equations.