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**1. Homework Statement**

A conical tank (with vertex down) is 10 feet across the top and 12 feet deep. If water is flowing into the tank at a rate of 10 cubic feet per minute, find the rate of change of the depth of the water when the water is 8 feet deep.

**2. Homework Equations**

Cone: V= (Ah/3)

Right Circular Cone: V=[(pi)(r^2)(h)]/(3)

**3. The Attempt at a Solution**

So on this on I'm confused about the equation I need to derive to begin with..

I looked up the volume of a cone and it had two choices (stated above)

So I think I need to use just the cone one because the problem doesn't say its a right circular cone. Is that correct?

Assuming I do in fact need to use V= (Ah/3)

Do I then plug in A=(pi)(r^2) which is the area of a circle? the book says A equalls the area of the base, which appears to be a circle to me...

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