The answer would be 9.57 ft.
For this, you would first need to make a diagram. After doing so, you would need to figure out what formula to use. The formula I used was [tex]tan(28) \frac{x}{18}[/tex]. Then you would multiply the 18 to the other side to get the x by itself. After using that formula, you would find that the answer is 9.57.
Hope this helped :)
