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A circle is growing. After t seconds, the radius of the circle is 10t cm. Find...

A circle is growing. After t seconds, the radius of the circle is 10t cm. Find the rate at which the area within the circle is increasing after:

(a) 1 second
(b) 3 seconds
(c) 5 seconds

answer in the form of ___ sq cm/sec

Math   Calculus   
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