The bat population in a certain Midwestern county was 260,000 in 2012, and the observed doubling time for the population is 34 years.
(a) Find an exponential model
n(t) = n02t/a
for the population t years after 2012.



(b) Find an exponential model
n(t) = n0ert
for the population t years after 2012. (Round your r value to four decimal places.)