Activity
University of Illinois: Quadratic Formula Activity
University of Illinois

University of Illinois: Quadratic Formula

For Students 9th - 10th
This site from the University of Illinois offers an excellent simulation of the quadratic formula, where you can type in different values for a, b, and c, and then view the change in the answer for x.
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Activity
Purplemath: Variation Equations Activity
Purple Math

Purplemath: Variation Equations

For Students 9th - 10th
Purplemath offers an extensive explanation of direct and inverse variation, containing several examples and real-world applications.
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Website
Variation Website
Other

Variation

For Students 9th - 10th
Site describes direct, inverse, and joint variation.
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