Luigi's Phone Shop charges $68.90 for its activation fee plus $18.42 for every gigabyte, g, of data you use over your limit. The equation that models the total cost (T) isT(g)=18.42g+68.90Which value in the equation represents the rate of change?

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?