Ineed . again. i am trying to solve each system of the equations. btw i am in pre algebra. u

The average human heart beats 72 beats per minute. how many times does it beat in 15 seconds?

Which graph represents y=^3 sqrt x+8-3 ?

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