I don't get it? What are the coordinates for the reflection of this triangle over y = x?

The graph of g(x) is a translation of y = which equation represents g(x)?

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

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?