Final answer:
For the function f(x) = -x - 5, when x is substituted with 0, the result is f(0) = -5.
Step-by-step explanation:
To find the value of f(0) for the function f(x) = -x - 5, you substitute 0 for x in the equation. This gives you:
f(0) = -0 - 5
Since -0 is just 0, the equation simplifies to:
f(0) = 0 - 5
Which then becomes:
f(0) = -5
Therefore, the value of f(0) is -5.