Help! With this math problem

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

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Which fraction is equal to 1hole and 2/5? a.3/5 b.75 c.57 d.73