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Asked Mar 3, 2019
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2. Suppose that two circles have the same center. One has radius 2 cm. and the other has radius
10 cm. Suddenly, the circles begin to expand. The radius of the smaller circle increases at a rate
of 4 cm/sec. The radius of the larger circle increases at a rate of
3 cm/sec.
a) How fast is the area between the circles changing 6 seconds later? Put units of measure on
your answer.
b) Is the area increasing or decreasing at that time? Support your answer.
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2. Suppose that two circles have the same center. One has radius 2 cm. and the other has radius 10 cm. Suddenly, the circles begin to expand. The radius of the smaller circle increases at a rate of 4 cm/sec. The radius of the larger circle increases at a rate of 3 cm/sec. a) How fast is the area between the circles changing 6 seconds later? Put units of measure on your answer. b) Is the area increasing or decreasing at that time? Support your answer.

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