Oil is leaking from a broken pipe at a rate of 160 ft³ per minute. Assume the oil forms a thin cylindrical slick of constant thickness 0.4 feet. Find the rate at which the radius, r, of the oil slick is increasing when r = 5 feet. (You may use the fact that a cylinder of thickness h and radius r has volume xr² h.) Include units in your final answer.

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Exponential Growth Model

The relation that represents an exponential function is: