Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-3 Measuring Segments - Practice and Problem-Solving Exercises - Page 24: 27


3.5 or -3.5

Work Step by Step

If A=0, then T must equal 7 or -7 for $\overline{AT}=7$. To find the midpoint, find the average of the two points. This gives $\frac{0+7}{2}=3.5$ and $\frac{0-7}{2}=-3.5$.
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