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: 82

Answer

10

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 $-1-(-7)$. Change the minus sign to a plus sign and insert the opposite of the second number in place of the second number. $-1-(-7)=-1+(7)=-1+7=6$ Next, we can add this to -4 by using the same process. $6-(-4)=6+(4)=6+4=10$
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