Jon goes to a flea market and sells comic books for 3 dollars each. He starts the night with 20 dollars in his cash register. At the end of the night, he has 47 dollars in his cash register.
How many comic books did Jon sell?

Help ASAP

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

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

Which of the following is the result of expanding the series