HELP 20 PTS ANSWER THE QUESTION ON THE PICTURE

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

What is the inverse of the function f(x) = 2x + 1?