Find the length of the missing side. PLEASE HURRY

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

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol