he amount of juice in a grapefruit is directly proportional to the cube of its diameter. Let j represent the amount of juice (in fluid ounces) in a grapefruit, let d represent the diameter (in inches) of the grapefruit, and let k be the constant of proportionality. Write an equation that relates j to d. j =   A grapefruit with a 4-inch diameter contains 6 fluid ounces of juice. Use the equation that relates j to d and the known information to find k. k =     How many fluid ounces of juice is contained in a grapefruit with a 5-inch diameter? Round to the nearest tenth of a fluid ounce. -------fl o

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