Please help it’s easy

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

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute

Identify this conic section. x2 - y2 = 16 o line circle ellipse parabola hyperbola