Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 1 - Section 1.2 - Operations with Real Numbers and Simplifying Algebraic Expressions - Exercise Set: 20

Answer

$-\dfrac{1}{10}$

Work Step by Step

Make the fractions similar using their LCD, which is 10, to obtain: $=\dfrac{7}{10} + \left(-\dfrac{8}{10}\right)$ The addends have opposite signs, so subtract the smaller absolute value from the bigger absolute value, andthen use the sign of the number with the bigger absolute value to obtain: $=-(\frac{8}{10} - \frac{7}{10}) \\\\ -(\frac{1}{10}) \\=-\frac{1}{10}$
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