Which two expressions are equivalent for any value of r?* a. 3(3r + 3) and 6r +6
b. 3(3r + 3) and 9r + 6
c. 9(r + 3) and 12 + 91
d. 9(r + 3) and 27 +91
Pick one of the remaining choices and explain on the lines below, why that
choice contains two expressions that are not equivalent for any value of r. help pls I'm just picking random stuff at this point​

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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