## Algebra 1: Common Core (15th Edition)

As x represents every half-year period, we know that x will equal 6 because there is a three-year time period. 3 years is the same as 6 half years. Therefore, simply plug in 6 for x in the equation: f(x) = 20(3$^{x}$) f(6) = 20(3$^{6}$) f(6) = 20(729) f(6) = 14,580