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1 November, 07:55

An oil slick is expanding as a circle. The radius of the circle is increasing at the rate of 19 meters per day. Express the area of the circle as a function of dd, the number of days elapsed.

A (d) = ?

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  1. 1 November, 08:05
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    Area of a circle = pi*r^2

    Radius of circle = 19*number of days elapsed = 19d

    Therefore: A (d) = pi * (19d) ^2
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