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: 40


$d(D, B) = 2$

Work Step by Step

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