#### Answer

$4$

#### Work Step by Step

To estimate $\sqrt {15}$, we use the square root function on our calculator to find that $\sqrt {15} \approx 3.87$.
Since $3.87$ is closer to $4$ than to $3$, we estimate the square root to be $4$.

Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

$4$

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