T Find an exponential function of the form P(t) = Pon that models the situation, and then find the equivalent exponential model of the form P(t) = Poen. Doubling time of 4 yr, initial population of 500. t T Find an exponential function of the form P(t) = Pon that models the situation. The exponential function is P(t) = . (Use integers or fractions for any numbers in the expression.)