Please help me with this. I'm stuck

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

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

The ratio of the height of two similar cylinders is 4 to 3 what is the ratio of their volumes