To find the value of \( | 5 - (-8) | \), we first simplify the expression inside the absolute value.
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Start by simplifying \( 5 - (-8) \): \[ 5 - (-8) = 5 + 8 = 13 \]
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Now, we take the absolute value: \[ | 13 | = 13 \]
Thus, the value of \( | 5 - (-8) | \) is \( 13 \).
The correct answer is D. 13.