Can anyone help with the last part of the question (aka part b which sould really be part c)? I'm quite stuck and I've finished the first two parts, but the third one doesn't seem to give all the necessary info to solve it

Cheers in advance

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

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

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial