Answer
$2$
Work Step by Step
If the coordinates of $M$ and $N$ are $x$ and $y$, respectively, then $d(M,N)=|y-x|$.
Thus,
$d(D,E)=|3-1|=|2|=2$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.1 Algebra Essentials - A.1 Assess Your Understanding - Page A11: 45
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