# Chapter R - Section R.1 - Basic Concepts - R.1 Exercises: 47

-5

#### Work Step by Step

The absolute value of a number $a$ is equal to $a$ if $a\geq0$ and is equal to $-a$ if $a\lt0$. $5\geq0$, so $|5|=5$ Therefore, $-|5|=-(5)=-5$.

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