HELP HELP WITH MY MATH PLS

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

If the measure of xyz is 81 what is the measure of yz

The frequency table shows a set of data collected by a doctor for adult patients who were diagnosed with a strain of influenza. patients with influenza age range number of sick patients 25 to 29 30 to 34 35 to 39 40 to 45 which dot plot could represent the same data as the frequency table? patients with flu