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David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Asphere has a diameter of 10 in. what is the volume of the sphere?

Using elimination, what is -4x+2y=-12 4x+8y=-24