Answer
A) x=21
Work Step by Step
\begin{array} {ll}
\\x+21=2x & \text{Corresponding Angle Theorem}
\\21=x & \text{Subtraction Propery of Equality}
\end{array}
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 3 - Parallel and Perpendicular Lines - 3-3 Proving Lines Parallel - Practice and Problem-Solving Exercises - Page 163: 47
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