## Basic College Mathematics (10th Edition)

Published by Pearson

# Chapter 9 - Basic Algebra - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 640: 81

-7

#### 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 $-12-(-3)$. Change the minus sign to a plus sign and insert the opposite of the second number in place of the second number. $-12-(-3)=-12+(3)=-12+3=-9$ Next, we can add this to -2 by using the same process. $-9-(-2)=-9+(2)=-9+2=-7$

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