Two ramps are placed back to back as shown. What is the length of the ramp labeled x? (View the attachment)

A. 3.6 ft.
B. 6.9 ft.
C. 7.5 ft.
D. 8.0 ft.

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Which value of c would make he following expression completely factored? 8x+cy

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