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**strawlion** A tank has the shape of an inverted circular cone (point at the bottom) with height 10 feet and radius 4 feet. The tank is full of water. We pump out water (to a pipe at the top of the tank) until the water level is 5 feet from the bottom. The work W required to do this is given by?

I've tried everything on this problem and have come up with many different answers, though I only have one submission left on my webassign. If anyone could give me any pointers it would be greatly appreciated!