Frank worked 8hours on the first four days of the week and 9hours on the fifth day he did this for 4weeks in a row. how many total hours did frank work

Astudent simplified a rational expression as shown.

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

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0