What is the total number of outcomes in each situation? rolling two number cubes

a.
8

b.
18

c.
12

d.
36

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

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b