## Elementary Algebra

Published by Cengage Learning

# Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.3 - Integers: Addition and Subtraction - Problem Set 1.3 - Page 20: 100

#### Answer

$= -13$

#### Work Step by Step

1. We substitute the $x, y, and \space z$ values into the equation using parenthesis: $x + y - z$ for $x = -18$, $y = 13$, $z = 8$ $= (-18) + (13) - 8$ $= - 18 + 13 - 8$ $= -26 + 13$ $= -13$

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