Warren has 40 coins (all nickels, dimes, and quarters) worth $4.05. he has 7 more nickels than dimes. how many quarters does warren have?

What is the value of x in the diagram below?

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

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2