Answer
$-31$
Work Step by Step
Since the signs of the numbers below are the same, add the numbers and copy their common sign. Hence, \begin{array}{r}\require{cancel}
-13
\\\underline{
-18
}\\
-31
\end{array}
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.3 - Integers: Addition and Subtraction - Problem Set 1.3 - Page 20: 69
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