Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - 2-5 Reasoning in Algebra and Geometry - Practice and Problem-Solving Exercises - Page 119: 41

Answer

35

Work Step by Step

The angle with a measure of 55 and the angle with a measure of y are complementary, because the larger angle that they comprise is a linear angle with an angle that is marked as a right angle. $55+y=90\longrightarrow$ subtract 55 from each side $y=35$
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