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 - Page 7: 67


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Work Step by Step

The book is making a key point here. Instead of using our ability to do Math in our head, it is important to use a calculator as well. Using a calculator, however, it is a good idea to use parentheses at all times to indicate the correct order of operations, for the calculator itself does not always follow the correct order.
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