The weight W of a sphere of a given material varies directly as its volume V, and its volume V varies directly as the cube of its diameter. a) Find an equation of variation relating the weight W to the diameter d. b) A particular ball that is 7 in. in diameter is known to weigh 49 lb. Find the weight of a ball that is 9 in. in diameter. a) W= b) The weight of a ball that is 9 in. in diameter islb. (Simplify your answer.)

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