Multiple Choice
The two radii of the frustum of a right circular cone are increasing at a rate of 7 centimeters per minute, and the height is increasing at a rate of 11 centimeters per minute (see figure) . Find the rate at which the surface area is changing when the two radii are 16 centimeters and 26 centimeters, and the height is 13 centimeters. [Note: The surface area does not include the top and bottom circles.] Round your answer to two decimal places.
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Correct Answer:
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