14

enter image description here

I just started using latex and the closest I've come is

$F\overset{fr}{\textsubscript{s}max}$

or

$F{fr \above 0pt \ \textsubscript{s}max}$
17

Try this one:

$F^{\mathrm{fr}}_{s\mathrm{MAX}}$. 

In math mode ^ means superscript and _ means subscript.

enter image description here

0

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