Evaluate the expression (ab)2 for a = 2 and b = 5. 100 50 20 625

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Which one ? is the answer and how to find this answer

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