## Introductory Algebra for College Students (7th Edition)

$12.8$
RECALL: The absolute value of a negative number is its opposite. In symbols, when $a\lt 0$, $|a| =-a$. $-12.8$ is negative therefore its absolute value is its opposite, which is $12.8$. Thus, $|-12.8| = -(-12..8) = 12.8$.