An oil slick is expanding as a circle. The radius of the circle is initially 2 meters and increases at the rate of 21 meters per day. Express the area of the circle as a function of t, the number of days

An oil slick is expanding as a circle. The radius of the circle is initially 2 meters and increases at the rate of 21 meters per day. Express the area of the circle as a function of t, the number of days elapsed. The area of a circle is A(r)=πr2.

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