? • (-10) = 90

I need a little help. If you can also explain that would help as well.

What is the simplified form of 7 √x • 7 √x • 7 √x • 7 √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

On a piece of paper, graph y< x+1. then determine which answer matches the graph you drew.