Question 1167018
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The horizontal major axis is 36 feet, so the semi-major axis is 18.<br>
The vertical semi-minor axis is 15 feet.<br>
The equation of the ellipse is<br>
{{{x^2/18^2+y^2/15^2=1}}}<br>
The truck will just fit through the tunnel if its sides are 6 feet each side of the center.  So the problem is asking for the height of the tunnel (y) when x=6.<br>
{{{6^2/18^2+y^2/15^2=1}}}<br>
You can do the arithmetic to find the answer....<br>