Answer
$\overline{EF}=8$
Work Step by Step
Let $b=\overline{EF}$
$17^{2}=15^{2}+b^{2}$
$289=225+b^{2}$
Subtract 225 on both sides
$64=b^{2}$
$8=b$
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 5 - Section 5.4 - The Pythagorean Theorem - Exercises - Page 240: 9a
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