Plz solve this question ..
x^a/(a-b)^1/(b-a) + X^b/(c-a)^1/c-b + X^c/(a-b)^1/(a-c)

Which answer is it for it to be simplified completely?

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

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2