Tobias sent a chain letter to his friends, asking them to forward the letter to more friends. The number of people who receive the email increases by a factor of


4


44 every


9.1


9.19, point, 1 weeks, and can be modeled by a function,


P


PP, which depends on the amount of time,


t


tt (in weeks).


Tobias initially sent the chain letter to


37


3737 friends.