A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

This video includes sample exercises and stepbystep explanations of conic sections for the California Standards Test.
Khan Academy

A tutorial of parabolas,focusing on vertex form and the focus and directrix, including several example problems.
Algebra Lab

Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
Paul's Online Math Notes

A site with step by step tutorials on how to draw and graph a variety of mathematical functions
Analyze Math

Online graphing calculator, useful for drawing out a function to visualize it or find key points.
http://www.coolmath.com

Standard form of a parabola and vertex equations
Standard form of a parabola

A tool that lets you interact with the graph of a parabola by changing the directrix and the focus.
math warehouse

Equations and graphs of parabolas.
Mathworld
