The lowest integer will be ''x''
I'm super rusty and not very good in slope intercept and I don't want to mess you up, but this video from Khan Academy (https://m.youtube.com/watch?t=215s&v=IL3UCuXrUzE) helped me understand it, you should check it out.
The formula is v=pi(r^2)(h)
pi(2^2)(4.2)
pi(16.8)
volume= 52.78m^2
Hope this helps :)
50. It's 0.25 x 200. Or 1/4 of 200