If 3 times a number is decreased by 12 the result is 5

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

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.