Experience with multiple representations fosters students' robust understanding of what functions are, how they behave, and how they can be composed.

Contributor Notes

Scott Steketee, stek@kcptech.com, who taught mathematics for eighteen years in the Philadelphia public schools, develops The Geometer's Sketchpad curriculum and resources at KCP Technologies and is an adjunct instructor of mathematics methods at the University of Pennsylvania.

Daniel Scher, dscher@kcptech.com, a senior scientist at KCP Technologies, is the principal investigator of the Dynamic Number project, funded by the National Science Foundation.

(Corresponding author is Steketee stek@kcptech.com)
(Corresponding author is Scher dscher@kcptech.com)
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