3divided by9 solve by drawing

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

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

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?