A bag contains several marbles. Each marble is red, white or blue. The probability of choosing a red marble is ½ and the probability of choosing a white marble is 2/8. What is the probability of choosing a blue marble?

What is the least number of marbles that can be in the bag? Suppose the bag contains the least number of marbles. How many of each color does the bag contain?

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.