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The Area of a Circular Sun Spot Is Growing at a Rate

Question 81

Multiple Choice

The area of a circular sun spot is growing at a rate of 1,200 km²/s. How fast is the radius growing at the instant when it equals 10,000 km?

A) 8.333 km/s
B) 0.000 km/s
C) 0.038 km/s
D) 0.019 km/s
E) 0.060 km/s

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