Final answer:
The value of the function f(x) = 2(x - 4) when x is 4 is 0. Substituting 4 into the function yields f(4) = 2(4 - 4) = 2(0) = 0.
Step-by-step explanation:
To find the value of the function f(x) = 2(x - 4) when x is 4, simply substitute 4 into the function:
f(4) = 2(4 - 4) = 2(0) = 0
Therefore, the value of f(4) is 0, which corresponds to option a.