Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter R - Review of Basic Concepts - R.2 Real Numbers and Their Properties - R.2 Exercises: 107

Answer

$d(Q, R)=12$

Work Step by Step

RECALL: The distance between the points Q and R on a number line, whose coordinates are q and r, respectively, is given by the formula: $d(Q, R) = |q-r| \text{ or } d(Q, R) = |r-q|$ Use the formula above, with $q = -1$ and $r=8$, to obtain: $d(P, R) \\=|8-(-4)| \\=|8+4| \\=|12| \\=12$
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