The vertex of this parabola is at (2,-1).when the y value is 0,the x value is 5.what is the coefficient of the squared term in the parabolas equation

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