Two oil tankers crash in the Pacific Ocean. The spreading oil slick has a circular shape, and the radius of the circle is increasing at 200 meters per hour. (a) Express the radius of the spill, r, as a power function of time, t, in hours since the crash. r = (b) Express the area of the spill, A, as a power function of time, t. NOTE: Enter the exact answer. A = (c) Cleanup efforts begin 7 hours after the spill. How large an area is covered by oil at that time? NOTE: Enter the exact answer or round to three decimal places. Do not include commas in your answer. The area will be m².

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