The expression n2 + n represents the total number of blocks used in the nth figure of a pattern. use the equation n2 + n = 56 to determine which figure has 56 blocks.

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

Which of the choices shown could be used to prove that aacp=abcp ?

What is the absolute value of the complex number -4-sqrt2i