A gambler begins to gamble with $5. Every hour, he counts the total money he has. In each of the scenarios (a) and (b), do the following : list the rate of money he wins, f(t), and the total money he has, F(t), at every hour, t, for 4 hours after he begins to gamble

If the money he earns is twice the number of hours he gambles, what will be the formula for f(t) and F(t) ?