Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 6 - Algebra: Equations and Inequalities - 6.1 Algebraic Expressions and Formulas - Exercise Set 6.1 - Page 349: 81


The statement makes sense.

Work Step by Step

The statement does make sense because in the parentheses have like terms which can be added and then multiplied by 3. Therefore, \[\begin{align} & A=3\left( 2x+5x \right) \\ & =3\left( 7x \right) \\ & =21x \end{align}\]
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