Enter an equation for the function. Give your answer in the form a(b)n. In the event that a = 1, give your answer in the form (b)n.
A pharmaceutical company is testing a new antibiotic. The number of bacteria present in a sample when the antibiotic is applied is 11000. Each hour, the number of bacteria present decreases by half. The number of bacteria remaining r(n) is an exponential function of the number n of hours since the antibiotic was applied.
the equation is r(n) = _____