Someone please answer the questions in the image

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 final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

Solve for n? [tex]z = \frac{3}{4} mn[/tex]