Composition of Functions Practice Test

A culture grows as $g(t)=500\cdot 2^{t/3}$ and analysis uses $f(x)=\ln(x)$. Using the function defined, what is $f(g(6))$?​

A population grows as $g(t)=300e^{0.04t}$ and analysis uses $f(x)=\ln(x/300)$. Using the function defined, what is $f(g(t))$?