Which of these graphs represents a function?

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

Which expression is equivalent to -5(3x - 6/7)