February 6, 2016

Homework Help: math

Posted by kelli on Saturday, December 19, 2009 at 11:19am.

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AP Calculus related rates problem?
The volume V or a cone (V = 1/3 r h) is increasing at a rate of 28 cubic units per second. At the instant when the radius r of the cone is 3 units, its volume is 12 cubic units and the radius is increasing at 0.5 unit per second.

c)At the instant when the radius of the cone is 3 units, what is the instantaneous rate of change of the area of its base with respect to its height h?

my teacher showed my how to get the answer but i dont understand why..can someone show the steps with explanation PLEASE? the way the answer is 3pi/8

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