Chuck has a gross pay of 815.70.by how much will chuck’s gross pay be reduced if he has the following items withheld?

Restrictions on f(x) = 1/x+5 and g(x) = x-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

Ineed to know the answer to this algebra question.