Thinking Mathematically (6th Edition)

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

Chapter 5 - Number Theory and the Real Number System - 5.5 Real Numbers and Their Properties; Clock Addition - Exercise Set 5.5: 13

Answer

4 should go in the blank. The problem should read: 3 + (4 + 5) = 3 + (5 + 4)

Work Step by Step

The commutative property of addition states that numbers may be added in any order without changing the value of the end result (answer). To show this: 3 + (4 + 5) = 3 + (5 + 4) First parentheses (ALWAYS FOLLOW ORDER OF OPERATIONS) 3 + (9) = 3 + (9) 12 = 12
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