College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.1 - Page 17: 77

Answer

Associative Property of Addition

Work Step by Step

Looking at the problem, we see that they distributed the 11 through all of the terms in addition. This shows that it is the Associative Property of Addition.
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