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}
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
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 - Page 7: 32
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