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

Answer

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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