Firstly, let us represent the bearings on a diagram;
From the diagram, we can find the value of d using pythagoras theorem. since it forms a right angled triangle.
[tex]\begin{gathered} d^2=4.3^2+1.8^2 \\ d=\sqrt[]{(4.3^2+1.8^2)} \\ d=\sqrt[]{(18.49+3.24)} \\ d=4.66\text{ miles} \end{gathered}[/tex]Therefore, the distance of the final destination from the trailhead is;
[tex]4.66\text{ miles}[/tex]
