Which of the following represent the distance formula? Select all that apply. A. d=(x1−x2)2+(y1−y2)2−−−−−−−−−−−−−−−− −−√
B. d=(x2−x1)2+(y2−y1)2−−−−−−−−−−−−−−−− −−√
C. d=(x2+x1)2+(y2+y1)2−−−−−−−−−−−−−−−− −−√
D. d=|x2−x1|2+|y2−y1|2−−−−−−−−−−−−−−−− −√

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