Answer
$-\frac{13}{70}$
Work Step by Step
$\frac{5}{7}-\frac{9}{10}$
$=-\frac{9}{10}+\frac{5}{7}$
$=-(\frac{9}{10}-\frac{5}{7})$
$=-(\frac{9\times7}{10\times7}-\frac{5\times10}{7\times10})$
$=-(\frac{63}{70}-\frac{50}{70})$
$=-\frac{13}{70}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 4 - Section 4.5 - Adding and Subtracting Unlike Fractions - Practice - Page 267: 4
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