The present age of Joshua father is four times that of Joshua. After 31/6 years, the difference in their age is 342/7 years. find their present ages.

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

True or false look at the picture pls : /

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.