I need help solving this problem

After two years, how much has been paid into interest?

On a piece of paper graph f(x)=5•(0.4)^x

The level of co2 emissions, f(x), in metric tons, from the town of fairfax x years after they started recording is shown in the table below. x 2 4 6 8 10 f(x) 26,460 29,172.15 32,162.29 35,458.93 39,093.47 select the true statement.