Which of the following terms appear in the expansion of (x+y)^10? the letter "a" in each term represents a real constant.

choices are:
ax^4y^6
ax^5
ax^3y^7
ax^6y^4
can be multiple

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