Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 3 - Adding and Subtracting Fractions - 3.3 Adding and Subtracting Unlike Fractions - 3.3 Exercises: 30

Answer

$ \frac{8}{21}$.

Work Step by Step

$\frac{5}{7} - \frac{1}{3} = \frac{5 \cdot 3}{7 \cdot 3} - \frac{1 \cdot 7}{3 \cdot 7} = \frac{15}{21} - \frac{7}{21} = \frac{15-7}{21} = \frac{8}{21}$.
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