Question

Please explain your work. The answer is not 6785.8, 1.5, or 6782.4.

Answer 1

`2160\pi \:\mathrm{ft^3} \approx 6786\:\mathrm{ft^3}`

Explanation:

The volume of a cylinder is given as:

`r^2\pi\cdot h`.

Thus, the difference of the cylinders' volumes are:

`|18^2\cdot 20\cdot \pi - 12^2\cdot 30 \cdot \pi|\approx \fbox{$6785.84\:\mathrm{ft^3}$}`.

Since you've said
`6785.8` is not being accepted as an answer, please check all instructions to see if there are directions asking you to specifically round your answer. If not, you can ask your teacher/instructor what they're looking for.