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Math·Advanced Math·Nonlinear functions

hard

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

A

I only

B

II only

C

I and II

D

Neither I nor II