Geometry: Common Core (15th Edition)

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: 9

Answer

-10

Work Step by Step

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