Answer:
The value of f(x) when x = 9 is 12.
Explanation:
Here, the given function,

Thus, for the values greater than -6 and less than 9 the function would be,

While, for the values greater than equal to 9 and less than 13,
The function would be,

Hence, it is clear that the value of f(x) when x = 9 is 12.