Answer
$$ -\frac{1}{10}$$
Work Step by Step
We know that two negatives is the same as a positive. Thus, the problem simplifies as follows:
$$ -\frac{4}{5} -(-\frac{7}{10}) \\ = -\frac{8}{10} + \frac{7}{10} \\ = -\frac{1}{10}$$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 639: 65
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