Multiple Choice
A mold culture in a dorm refrigerator is circular and growing. The radius is increasing at a rate of 0.4 cm/day. How fast is the area growing when the culture is 3 centimeters in radius? (The area of a disc of radius r is .)
A)
B)
C)
D)
E)
Correct Answer:

Verified
Correct Answer:
Verified
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