The Radius of a Circular Puddle Is Growing at a Rate

question 27

Multiple Choice

The radius of a circular puddle is growing at a rate of $8 \frac { \mathrm { cm } } { \mathrm { s } }$ . How fast is the area growing at the instant when it equals 20 cm² Round your answer to the nearest whole number.

• A) \(127 \frac { \mathrm { cm } ^ { 2 } } { \mathrm {~s} }\)
• B) \(1005 \frac { \mathrm { cm } ^ { 2 } } { \mathrm {~s} }\)
• C) \(3 \frac { \mathrm { cm } ^ { 2 } } { \mathrm {~s} }\)
• D) \(72 \frac { \mathrm { cm } ^ { 2 } } { \mathrm {~s} }\)
• E) \(63 \frac { \mathrm { cm } ^ { 2 } } { \mathrm {~s} }\)

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