Four girls decide to spread a rumor. Within the first hour, each girl tells three other people. Then within each subsequent hour, each person that knows the rumor
continues to tell three more people about it. Let x = the number
of hours, and y
the number of people who know of the rumor. After six hours, how many people
know about the rumor? Set up the equation represented by this situation using the
variables above, and solve the problem, showing the calculation that you did to get
your answer.