A conical paper cup is 20 inches tall with a radius of 10 inches. The bottom of the cup is punctured so that the water leaks out at a rate of (2pi) / 3 cubic inches per second. At what rate is the water level changing when the water level is 7 inches?

V = 1/3 *pir^2h

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To find at what rate the water level is changing we need to determine the rate of change of th... View the full answer