Final answer:
The absolute value of (x - (-18)) is 0 when x is less than -18.
Step-by-step explanation:
When evaluating |x - (-18)| with x < -18, we need to substitute x with -18 in the expression. Since x is less than -18, the expression becomes | -18 - (-18)|. Simplifying further, we have |0| which equals 0. Therefore, the value of |x - (-18)| is 0 when x < -18.