## Algebra: A Combined Approach (4th Edition)

The absolute value of a real number $a$, denoted by $|a|$, is the distance between $a$ and 0 on a number line. Therefore, $|a|=a$ if $a\geq0$, and $|a|=-(a)$ if $a\lt0$. Therefore, $|7+(-17)|=|-10|=-(-10)=10$.