PLs help I dont understand

The perimeter of a square is80-64y units. which expression can be used to show the side length of one side of the square?

What is the solution to the equation 9^(x+1) =27

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?