Answer
$s-r$
Work Step by Step
We use the segment addition postulate:
$RS = s +(-r) = s-r$.
Note, since r is a negative number (and lengths can't be negative), we multiply r by $-1$.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 10 - Section 10.3 - Preparing to Do Analytic Proofs - Exercises - Page 474: 30b
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