Answer
$(s+t)+6$
$s+(6+t)$
Work Step by Step
The associative property can be used to regroup addends.
$s+(t+6)=(s+t)+6$
The commutative property can be used to reorder addends.
$s+(t+6)=s+(6+t)$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1 - Introduction to Algebraic Expressions - 1.2 The Commutative, Associative, and Distributive Laws - 1.2 Exercise Set - Page 17: 39
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