Answer
$\frac{1}{42}$
Work Step by Step
$6^{-1}-7^{-1}=\frac{1}{6}-\frac{1}{7}=\frac{1\times7}{6\times7}-\frac{1\times6}{7\times6}=\frac{7}{42}-\frac{6}{42}=\frac{7-6}{42}=\frac{1}{42}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Review - Page 403: 38
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