What is the unit used to measure the distance between the earth and the sun

Answer this question only if you know the answer! 30 points and

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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