College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter R - Section R.2 - Algebra Essentials - R.2 Assess Your Understanding - Page 27: 37


$d(D, E) = 2$

Work Step by Step

$d(D, E)$ represents the distance between the points D and E on a number line. If the coordinates of D and E are $d$ and $e$, respectively, then: $d(D, E) = |d-e|$ Based on the given number line, the coordinates of D and E are 1 and $3$, respectively. Use the formula above to obtain: $d(D, E) = |1-3| = |-2| =2$ Thus, $d(D, E) = 2$
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