Without a calculator or computer, match the function $2^x$, $x^{3}$, $\ln(x)/\ln(4)$ and $x^{1/7}$ to their graphs in the figure.
$f(x) =$ (the blue curve)
$g(x) =$ (the red curve)
$h(x) =$ (the green curve)
$k(x) =$ (the black curve)