Answer
-1.5
Work Step by Step
The midpoint of a segment is the average of the two endpoints.
$M=\frac{-9+6}{2}=\frac{-3}{2}=-1.5$
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 - 1-7 Midpoint and Distance in the Coordinate Plane - Practice and Problem-Solving Exercises - Page 54: 7
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