Question 376·Hard·Advanced Math

The functions $r$ and $s$ are defined for $x \ge 0$ by the following equations.

I. $r(x)=14(0.83)^x+6$

II. $s(x)=-9(1.07)^x+11$

Which of the following equations displays, as a constant or coefficient, the minimum value of the function it defines, where $x \ge 0$?