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In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Twelve less than a number is at most 20

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