To get to the other side of the lake, one can drive around it on lake road, go over the bridge or ride the ferry. how many different ways can one go across the lake and back?
5,6,9

Find the solutions for a triangle with a =16, c =12, and b = 63º

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

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).