Answer
1
Work Step by Step
The opposite of a real number $a$ is written $-a$. That is, the opposite of a number is the negative of a number.
Therefore, we can place a negative sign in front of a number to find its opposite.
$-(-1)=1$
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 - 1.6 Subtraction of Real Numbers - 1.6 Exercise Set - Page 49: 37
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