An elevator company installs elevators in new buildings. The number of meters of cable needed for an elevator is 12 times the number of stories in the building plus an extra 15 meters needed
to go into the machinery. Which of the following functions best describes how many meters of
cable are needed to install the elevator if there are s stories in the building?

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