# The Hopping Frog Word Problem for Rate, *d* = *r* *t*

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The rate equation can be used to tutor many concepts, including rates, signed multiplication, fractions, unit cancellation, and word problems.

Contributed by: Robert L. Brown (March 2011)

Open content licensed under CC BY-NC-SA

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This Demonstration is dedicated to the memory of Preston Blair (1908–1995), who taught this author and thousands of others to draw animations.

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