Answer
-9.1
Work Step by Step
For any real number $a$, we know that $-(-a)=a$. That is, the opposite of the opposite of $a$ is $a$.
Therefore, when $x=-9.1$, $-(-x)=-(-(-9.1))=-(9.1)=-9.1$.
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: 36
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