3- 2x, x < -2
f(x) = x2 + 2x + 4,-2 sxs 5
Vx+1, x >5
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What is best way to getting answer for my exam is

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

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =