Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 1 - Foundations for Algebra - 1-6 Multiplying and Dividing Real Numbers - Practice and Problem-Solving Exercises - Page 42: 43

Answer

-1

Work Step by Step

Anything divided by itself is one. However, because one of the 12/13 in the problem is negative, we account for the fact that a negative divided by a positive or a positive divided by a negative is always a negative by making the answer -1 instead of 1.
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