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 every 9.1 weeks, and can be modeled by a function, f(p) which depends on the amount of time, t (in weeks). Tobias initially sent the chain letter to 37 friends.
Write an exponential function describing this scenario. Use "^" to denote an exponent and "/" to denote a fraction sign.

•THIS WAS FROM KHAN ACADEMY
•EXPONENTIAL MODELS IF THAT HELPS