I would say C. and A. Hope this helps.
Part i


Substituting,

Answer: -1
Part ii
I'm not sure that one's typed in correctly but I'll solve it as written.



We're not asked to simplify it so I wont. Substituting,

Answer: 59/306
If we write
where we see
in the equation and set the result equal to
, we get the result.
Hey!
The formula for finding volume of a cylinder is: π · r² · h


Now multiply

<em>Your answer is B)192π units³</em>
Good luck and hope this helps! :)