"in 2000, the u. s. population was 281 million people. in 2008, it was 305 million. what was the rate of population change per year? " (what equation do i need to do? you can answer the question, but i need to show work as well. )

Fred and gene are hang gliding. fred is 700 feet above the ground and descending at 15 ft/s. gene is decending as shown in the table. interpret the rates of change and initial values of the linear functions in terms of the situations they model. show all work. freds equation is f(x)=-15x+700. ( genes is the table attached)