[tex]tan(30) = (\frac{x}{7} )\\x = 7*tan(30)[/tex]
After this step, find the button on your calculator that says 'tan' and type n 30 degrees, then press enter or the equal sign or whatever button you press to calculate.
You should get that tan(30) = 0.5774
Now plug that back into the equation
[tex]x = 7 * 0.5774 = 4.0415[/tex] (approximated)
Hope that helps!
