To find \( f(0) \) using the given function rule \( f(x) = \frac{4}{12}x + 9 \), we will substitute \( x = 0 \) into the function.
\[ f(0) = \frac{4}{12}(0) + 9 \]
Calculating the first part:
\[ \frac{4}{12}(0) = 0 \]
Now, adding 9:
\[ f(0) = 0 + 9 = 9 \]
Therefore,
\[ f(0) = 9 \]