Answer
$3$ miles
Work Step by Step
Given
\begin{equation} d=\sqrt{1.5 h}.
\end{equation} We are given that $h = 6$ feet and want to find the distance that a person can see to the horizon. Find $d(6)$. \begin{equation}
\begin{aligned}
d(6)& = \sqrt{1.5 \cdot 6} \\
&= 3.
\end{aligned}
\end{equation} The distance that a person can see to the horizon $3$ miles.
