Identify the terms and like terms in the expression. A3 + 4 + 2t – 9 + t Which statements are true? Check all that apply. The expression contains seven terms. The terms in the expression are a3, 4, 2t, 9, and t. The constants, 4 and 9, are like terms. Like terms have the same variables to the same powers. A3, 2t, and t are variables, so they are like terms. 2t and t are like terms.

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