To find this, use trigonometry, specifically tangent.
Equation:
[tex] \tan( 70) = \frac{39}{x} [/tex]
Multiply:
[tex] \tan(70) \times x = 39[/tex]
Divide:
[tex]x = 39 \div \tan(70) [/tex]
Solve:
[tex]x = 14.2[/tex]
The answer is the second option, 14.2. Hope this helps!! :)
