the line modes the temperature on a certain winter day since sunrise. What is the y-intercept of the line? what does the y-intercept represent?

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).

Combine like terms to make a simpler expression 3z+z