Solved: How fast is its area growing at the instant when the radius, Mathematics

How fast is its area growing at the instant when the radius

The radius of a circular puddle is growing at a rate of 20 cm/sec.

(a) How fast is its area growing at the instant when the radius is 40 centimeters? HINT [See Example 1.] (Round your answer to the nearest integer.)

cm²/s

(b) How fast is the area growing at the instant when it equals 25 square centimeters? HINT [Use the area formula to determine the radius at that instant.] (Round your answer to the nearest integer.)

cm²/s

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Mathematics: How fast is its area growing at the instant when the radius

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