Question 2 Suppose that a is the area of a disc with radius r which is expanding in time t measured in seconds. (a) Express in terms of r and dr. (b) Suppose an oil tanker is leaking oil which spreads in the shape of a disc on the surface of the ocean. If the radius increases at a rate of 1 m/s, how fast does the area of the spill increase when the radius is 30m?

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