PLSSS I NEED HELP QUICK THIS IS A UNIT TEST IF I GET THIS WRONG ILL HAVE A F :(

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

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

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?