Hotmath.com is available for all PVI Students and it provides explanations to the odd-numbered problems in the textbooks. The password is '1panther1': http://hotmath.com/
The National Library of Virtual Manipulatives is a very cool website that has visual tools to help learn Math concepts. It is run by Utah State University: http://nlvm.usu.edu/en/nav/vlibrary.html
Purple Math has links to free tutorial pages for Algebra, among others. http://www.purplemath.com/lessons.htm
Data Flyer is a nice line graphing site, allowing you to interactively see how changes to the slope or the the y-intercept affect the line. You will need Java loaded on your machine. http://www.shodor.org/interactivate/activities/DataFlyer/
Conic Flyer allows you to see how changes to h, k, a, and b affect Conic Sections... http://www.shodor.org/interactivate/activities/ConicFlyer/?version=1.6.0_11&browser=Mozilla&vendor=Sun_Microsystems_Inc.
This is a Flash program that steps you through Matrix Multiplication. http://www.intmath.com/Matrices-determinants/4_Multiplying-matrices.php#matops