The situation given can be pictured as follows:
The altitude reached by the plane is the opposite leg of the angle of 12°, to find it we can use the tangent function, which is defined as:
[tex]\tan \theta=\frac{\text{opp}}{\text{adj}}[/tex]Plugging the values given we have that:
[tex]\tan 12=\frac{x}{500}[/tex]solving for x we have:
[tex]\begin{gathered} \tan 12=\frac{x}{500} \\ x=500\tan 12 \\ x=106.2783 \end{gathered}[/tex]Therefore the height of the plane is 106.2783 ft.