Which of the following sets of ordered pairs represents functions? {(10,5), (-10,-5), (5,10), (-5,-10)}

{(10,5), (10,-5), (5,10), (5,-10)}

{(-6,-1), (13,8), (1,6), (1,-10)}

{(3,5), (-17,-5), (3,-5), (-17,5)}

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?