Answer
-10
Work Step by Step
The midpoint of a segment is the average of the two endpoints.
$M=\frac{-8+(-12)}{2}=\frac{-20}{2}=-10$
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: 9
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