Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 9 - Basic Algebra - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises: 79

Answer

12

Work Step by Step

According to the last step of order of operations, we must evaluate addition and subtraction from left to right. First, we only consider $4-(-13)$. Change the minus sign to a plus sign and insert the opposite of the second number in place of the second number. $4-(-13)=4+(13)=4+13=17$ Next, we can add this to -5. $17+(-5)=12$
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