Help me I need solution please I need right now :(

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

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

Multiply and simplify. 2x2y3z2 · 4xy4x2 how to do?