Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 4 - Review: 79

Answer

-2

Work Step by Step

$\frac{\frac{2}{5}-\frac{1}{2}}{\frac{3}{4}-\frac{7}{10}}$ $=(\frac{2}{5}-\frac{1}{2})\div({\frac{3}{4}-\frac{7}{10}})$ $=(\frac{2\times2}{5\times2}-\frac{1\times5}{2\times5})\div({\frac{3\times5}{4\times5}-\frac{7\times2}{10\times2}})$ $=(\frac{4}{10}-\frac{5}{10})\div({\frac{15}{20}-\frac{14}{20}})$ $=(\frac{-1}{10})\div({\frac{1}{20}})$ $=(\frac{-1}{10})\times({\frac{20}{1}})$ $=\frac{-20}{10}$ $=\frac{-20\div10}{10\div10}$ $=\frac{-2}{1}$ $=-2$
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