Question

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

Answer 1

Answer:

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

Step-by-step 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.