#### Answer

$5$

#### Work Step by Step

The distance formula is: $d = \sqrt{(y_2-y_1)^2+(x_2-x_1)^2}$. This finds the distance $d$ between two points $(x_1,y_1)$ and $(x_2,y_2)$. Distances are always positive.
$d = \sqrt{(5-1)^2+(8-5)^2} = \sqrt{25} = 5$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$5$

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