Answer:

Explanation:
Given functions:

(g o f)(x) is a composite function.
Composite functions are when the output of one function is used as the input of another.
Therefore, the given composite function (g o f)(0) means to substitute the function f(x) when x=0 in place of the x in function g(x).
![\begin{aligned}\implies (g \circ f)(0)&=g[f(0)]\\& = g(2(0)+6)\\&=g(0+6)\\&=g(6)\\&=6^3\\&=216\end{aligned}](https://img.qammunity.org/2023/formulas/mathematics/high-school/dyzpijr47as3wyxqat0ybbxi3mmrm2yaqb.png)