To calculate the approximate value of f(5), we have to substitute x=5 on the function f(x):
f(x)=6.87(2.5)^(x-1)
[tex]\begin{gathered} f(x)=6.87(2.5)^{5-1} \\ f(x)=6.87(2.5)^{4^{}} \\ f(x)=6.87(\frac{625}{16}) \\ f(x)=\frac{17175}{64}=268.36 \end{gathered}[/tex]
