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: 53

Answer

$11$

Work Step by Step

Substituting $ n=3 ,$ the given expression, $ 81-2[5(n+4)] ,$ evaluates to \begin{array}{l}\require{cancel} 81-2[5(3+4)] \\\\= 81-2[5(7)] \\\\= 81-2[35] \\\\= 81-70 \\\\= 11 .\end{array}
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