A child places 2 marbles at a time into a container at the end of every second. let m(t) be the number of marbles in the container as a function of the elapsed time (t) in seconds. What are the domain and range of the function M(t)

Pls , the question is in the picture!

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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