Which statements are true when solving x^2=81

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Find the area of a parallelogram with base 15 yards and height 21 2/3

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