Use the diagram to fi d the missing lenght of the pool (please i need the help)

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Need on this geometry question. explain how you did it.

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is