Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.4 - Integers: Multiplication and Division - Problem Set 1.4: 59

Answer

-7

Work Step by Step

Because multiplication is before subtraction and addition in order of operations, we first multiply and then we add and subtract. $6-4+(-12)-(-21)-18=6-4-12+21-18=-7$
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