Help!! What is the reduced and simplified value of the expression given below?

Find the missing dimension extra points

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

The product of 3 and a number increased by 8 is 31 written as an equation