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Rate
The math word "rate" is described in the pages listed below. If you not find what you need, you can also search the web for other definitions.
An application of the derivative is in finding how fast something changes. For example, if you have a spherical snowball with a 70cm radius and it is melting such that the radius shrinks at a constant rate of 2 cm per minute. How fast is the volume of the snowball shrinking? Interactive calculus applet.
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