alegebra
posted by Rachael .
a stone is thrown into a cylindrical water tank 2 feet in diameter, causing it to rise 1.5 inches. what is the volume of the stone?

Does the tank or the water rise? Your question doesn't make that clear.

the water rises

the change in the volume of the water in the tank equals the volume of the stone
so volume change = Pi(r^2)h, where r is the radius and h is the height
so V = Pi(24^2)(1.5) cu inches
= appr. 2714 cu inches. 
24 inches isn't that the diameter
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