4 + (−6) = −10 + (−15) =

−5 + 12 =

8 + (−7) =

11 + (−11) =

−9 + (−11) =

3 + (−13) =

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

When y’all answer can y’all explain too !

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x