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The solid in problem 12-59 is a storage tank and liquid is being added at a rate of cubic units per minute. How fast is the level of the liquid in the tank rising when the level is units above the lowest point of the tank?

Graph the functions.
The lowest point is at .
The height is . The radius is .
The volume will be .

Express the main function in terms of , which is the radius.

Let and solve for .