Need help finding the volume of a cylinder with two hemispheres removed

I figured the height must be 30 from the radius as you just double as it’s two hemispheres touching
 
First, what is the volume of a cylinder with height 30 cm and radius 15 cm, ignoring the hemispheres?
Second, the two hemispheres have the same volume as a sphere of radius 15. What is the volume of that sphere?
Third, subtract!
 
Ok so volume of cylinder is 21205.75 And the two hemispheres with a volume of 14137.17 then them subtracted to get 7068.58 cm cubed
 
Where were you struggling? Just trying to read it upside down?
 
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