Answer
24
Work Step by Step
According to the Segment Addition Postulate, $RS+ST=RT$. So, if $RS=15$ and $ST=9$, we substitute these values into the equation to obtain that $RT=15+9=24$.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 1 - Tools of Geometry - 1-3 Measuring Segments - Practice and Problem-Solving Exercises - Page 24: 12
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