HELP WITH THIS MATH QUESTION PLEASE

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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

Find the arc length of the semicircle. 7the grade