Solve 5x^2-7=60 using the square root method of quadratics

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

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?