Answer
C
Work Step by Step
$d_{AB}=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$
substitute given values
$d_{AB}=\sqrt{(-3-1)^2+(-1-7)^2}$
simplify in parentheses
$d_{AB}=\sqrt{(-4)^2+(-8)^2}$
simplify
$d_{AB}=\sqrt{16+64}$
$d_{AB}=\sqrt{80}$
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 - Common Core Cumulative Standards Review - Selected Response - Page 77: 11
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