Guys who know it, can u me with it

Nikolas calculated the volume of the prism. his work is shown below.

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great