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Answer #1:

Mass is the product of volume and density. You can find the volume of a sphere

with a radius of four (regardless of the unit of measure) using v=4/3pi(r3). With

the volume you must multiply by the density to find the mass.

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Answer #2:

As written, the question has no answer, simply because the mass of a sphere

doesn't depend on its size. A hundred spheres can easily all have the same size

but a hundred different masses.

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Q: Find the mass of a sphere with a radius of 4?
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