2. which type of wave can transmit
energy through a vacuum?
sound
longitudinal
electromagnetic

Write a real-world solution that can be represented by the equation y = 7x be sure to explain what the variables represented in the solution

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

If np3 /nc2 = 6, find the value of n