To rewrite the equation in terms of \( f \) from \( f + s = 16 \), we subtract \( s \) from both sides:
\[ f + s = 16 \]
Subtracting \( s \) from both sides gives:
\[ f = 16 - s \]
So, the equation rewritten in terms of \( f \) is:
\[ f = 16 - s \]