A triangle has side lengths of (6p-7) centimeters,(7p-2) centimeters and (6q-9) centimeters. Which expression represents the perimeter, in centimeters, of the triangle?

What could explain what happened when the time was equal to 120 minutes

Can someone answer this question? : )

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