Answer
$(a+b)+c$, associative property of addition
Work Step by Step
$a+(b+c)=a+b+c=(a+b)+c$
To prove this, subtract any terms from the equation and you will receive equivalent expressions.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.2 - Real Numbers - P.2 Exercises - Page 15: 3
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