Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 10 - Radical Expressions and Equations - Common Core Cumulative Standards Review - Selected Response - Page 660: 25

Answer

The ladder is 15 feet away from the wall.

Work Step by Step

Set x to be the distance between the ladder and the wall. Via the Pythagorean theorem, $x^2+20^2=25^2$, thus, $x^2=225$. Taking the square root of both sides brings us to x=15 feet.
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