Answer
x=15, because the angles are complementary.
Work Step by Step
The diagram shows complementary angles, but the calculation shows supplementary angles. The calculation should be:
$4x+2x=90$
$6x=90$
$x=15$
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 - 1-5 Exploring Angle Pairs - Lesson Check - Page 37: 6
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