Write the algebraic expression:
3. one-forth a number and 7
4. 24 divided by the sum of a number and 6
5. 20 less than a three times a number
6. the product of a number and itself

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)