Okay, here we have this:
Considering the provided information we are going calculate how far is the plane from the airport, so we obtain the following using the law of cosines:
[tex]\begin{gathered} a=\sqrt[]{120^2+150^2-2\cdot120\cdot150\cdot\cos (129.17)} \\ a\approx244\text{ miles} \end{gathered}[/tex]
Finally we obtain that the plane is approximately 244 miles far from the airport.
