Chepi is an ecologist who studies the change in the narwhal population of the arctic ocean over time. she
observed that the population loses 5.6% of its size every 2.8 months. the population of narwhals can be
modeled by a function, n, which depends on the amount of time, t (in months).
when chepi began the study, she observed that there were 89,000 narwhals in the arctic ocean.
write a function that models the population of the narwhals t months since the beginning of chepi's study.