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## Homework Statement

1.express the volume in terms of the diameter d of the sphere

2.write an equation to find the density of the sphere in terms of mass M and diameter d

## Homework Equations

sphere Volume = 4 x pi x r^3 / 3

density = mass/volume

## The Attempt at a Solution

1. d=2r so V = d^3 x pi / 6

2. density = M / V(=d^3 x pi /6) = 6M/pi x d^3

but my teacher said it is wrong. what is wrong with my answer?