When the sun shines at a 75 angle to the ground, Nadia’s shadow is 18 inches long. To the nearest inch, how tall is Nadia?

$x=\tan \left(75^{\circ \:}\right)\cdot \:18$

$\tan \left(75^{\circ \:}\right)=2+\sqrt{3}$

$x=18\left(2+\sqrt{3}\right)$ or $x=67.18$

-Vinculum