Answer
4.9
Work Step by Step
We know that:
$$ AX+XB=AB$$
Thus, we find:
$$ 11.8=6.9 + XB \\ XB =4.9$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter P - Preliminary Concepts - Chapter P Test - Page 30: 11
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