Answer is 405.3146926 i did it in my calculator
I don't say you have to mark my ans as brainliest but if it has really helped u plz don't forget to thank me....
Answer:

Step-by-step explanation:
V = 
(using differentiation product rule)
plug known values in for r, h, r', and h'



All of them may u please be more specific
The answer would be 20 because you have 5 blocks that are cut into 1/4. It doesn't say anything about any of the pieces disappearing or being used yet so you multiply 4*5 and then you get the answer.