Airline Profit The table gives the price, in dollars, of a round-trip flight from De...

Airline Profit The table gives the price, in dollars, of a round-trip flight from Denver to Chicago on a certain airline and the corresponding monthly profit for that airline on that route.

a. Find a model for the data.

b. Calculate the average rate of change of profit when the ticket price rises from $200 to $350.

c. Calculate the average rate of change of profit when the ticket price rises from $350 to $450.