SAT Nonlinear functions Question

The functions $f$ and $g$ are defined by the given equations below, where $x\ge 0$. I. $f(x)=18(1.4{)}^{x+5}$ II. $g(x)=18(1.16)(1.4{)}^{x+3}$ Which of the following equations displays, as a constant or coefficient, the minimum value of the function it defines, where $x\ge 0$?