Fourteen years time a mother will be twice as old as her son. Four years ago the sum of their ages was thirty .Find their ages

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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