Use the following regression equation regarding car mileage to answer the questior Highway = 0.892 + 1.337 - (City) Note that City is the estimated miles per gallon (mpg) a car gets while driving on cit streets, and Highway is the estimated miles per gallon (mpg) a car gets while driving on highways. What is the expected salary of a professor who has worked at a college for 15 year 21.9 mpg O 30.8 mpg O 16.5 mpg O 31.6 mpg