A restaurant offers 9 appetizers and 12 main courses. How many ways can a person order a two-course meal? There are
ways a person can order a two-course meal.

Find the required measurements of the following trapezoids. a = 8 cm b = 16 cm h = 10 cm

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

How do you use the elimination method for this question? explain, because i really want to understand!