Answer
$-\frac{1}{10}$
Work Step by Step
$\frac{7}{10}-\frac{4}{5}=\frac{7}{10}-\frac{4\times2}{5\times2}=\frac{7}{10}+(-\frac{8}{10})=-\frac{1}{10}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.