Answer:
Step-by-step explanation:
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Every time you play a song 8 different songs can be played, since you do this 3 times:

Or, an easier way to write this if play them many times:

In which the 8 is how many options and the 3 how many times you play.
The volume of a sphere is (4πr^3)/3 and since r=d/2, volume of a given sphere with respect to its diameter is:
V=(4πd^3)/24
V=(πd^3)/6 in this case d=8.65 so
V≈338.88 in^3 (to the nearest hundredth)
Check the picture below.
make sure your calculator is in Degree mode.