Linda contructs a triangle with one side 5 inches long and another side 7 inches long. which is not a possible legth for the third side? a)3 inches b)6 c)11 d)12

I'm terrible at math any here is appreciated.

What is the area of the trapezoid shown ?

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