PLEASE HEL

ginevra is an ecologist who studies the change in the tiger population of siberia over time. the relationship between the elapsed time t, in years, since ginevra started studying the population, and the number of tigers, N(t), is modeled by the following function:
N(t)=537×(1/3)^t/2
complete the following sentence about the decay rate of the tiger population.
the number of tiger is reduced by a factor of 1/3 every years.