Answer
$\text{approximately }1.63\text{ }m$
Work Step by Step
Using the given formula $
h=\dfrac{0.00252d^{2.27}}{e}
,$ with $
d=25
,$ and $
e=2.3
,$ then
\begin{align*}
h&=\dfrac{0.00252(25)^{2.27}}{2.3}
\\\\&\approx
1.63
.\end{align*}
Hence, the optimal height, $h,$ of the letters of a message printed on pavement is $
\text{approximately }1.63\text{ }m
.$
