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 - 1.1 - Numerical and Algebraic Expressions - Problem Set 1.1: 32

Answer

$60$

Work Step by Step

Using order of operations, the given expression, $ 78-\dfrac{6(21-9)}{4} ,$ simplifies to \begin{array}{l}\require{cancel} 78-\dfrac{6(12)}{4} \\\\= 78-\dfrac{72}{4} \\\\= 78-18 \\\\= 60 .\end{array}
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