Solve the proportion x/5=16/20

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

Find the area of a parallelogram with the given vertices. p(-2, -5), q(9, -5), r(1, 5), s(12, 5)

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.