Need this done with work shown please all up to question 16.

The formula for cylinder of pi is v = π r ^ 2 h.

So you are going to do pi x 6^2 x 12 = 1357.168026350791 then divide 1357.168026350791 by pi and you get C. 432 pi in.^2

Also here is a link to a calculator that can really help with problems like this.
https://www.eeweb.com/tools/calculator

Hope this Helps!!