math

The volume of a sphere depends on the sphere's radius:V=4/3πr^3.(A)If the radius of a sphere is 3 feet,what is the volume?Give exact and approximate answers and use correct units.(B)Solve for r in the volume formula.(C)If the volume of a sphere is 20 cubic inches,what is the radius?Give exact and approximate answers and use correct units.

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  1. actually
    V = (4/3) pi r^3
    if r = 3 ft
    V = (4/3) pi (27) = 4 *9 * pi = 36 pi = 113.097 ft^3

    (4/3) pi r^3 = 20 in^3
    r^3 = (60/4 pi) = 15/ pi
    r = (15/ pi)^1/3
    = 1.684 inches

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