A. True. The rage of change is the same as slope which his the total price divided by the number of hours.
B. False. Lydia's price per hour is smaller than Camilla. How can we tell? By how steep the lines are. Camilla's line is steeper, or goes up faster, in the same time period compared to Lydia. So Camilla is the more expensive babysitter
C. True. Note how the point (5,35) is on Lydia's line. In 5 hours, Lydia charges $35, so 35/5 = $7 is the charge per hour.
D. False. The point (x,y) = (5,35) is not on Camilla's line. Instead, the proper point is (5,45). This means Camilla charges $45 for 5 hrs of work.
E. True. Multiply the result found in part C by 2 and we get 2*7 = 14