Question

PLEASE HELP!!!!!

Answer 1

Answer:

Step-by-step explanation:

The formula for the volume of a sphere is

$V=\frac{4}{3}\pi r^3$ In order to use this formula we have to have a value for the radius and right now we don't. But we can find it indirectly by using the circumference formula. The circumference formula is

$C=2\pi r$ If the circumference is 20π, then we will fill that in for "C" and solve for r:

20π = 2πr and if you divide both sides by 2π, you'll get that r = 10. Now we have a radius.

Using that in the volume formula:

$V=\frac{4}{3}\pi (10)^3$ and then simplifying a bit:

$V=\frac{4}{3}\pi (1000)$ and

$V=\frac{4000\pi}{3}$ which divides to give you

$V=1333.33\pi$, third choice down.