What is 1+1 (PLZ HELP ASAP I NEED TO BREAATH I CANT BREATH)

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

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Which best explains why this triangle is or is not a right triangle ?