2,1,6,13,22a)find the next two number of list. b)determine an algebraic expression from the given list of the number. c)find the sum of the first 70 numbers in the list.

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)