Answer:
I believe it would be 21 units . dont let extra line's confuse you just pay attention to the letters its asking for
If we take the angle 60° as the angle from the ground to the beam and let x be the distance from the base of the billboard to the bottom of the brace, the trigonometric equation which would best represent the scenario is,
x = (20 ft) (cos 60°)
x = 10 ft
Thus, the distance from the base of the billboard to the bottom end of the brace is 10 ft.
Subtract 5.82 from 8.95 to get your answer.
So you first want to distribute the 12 into what is inside the parentheses. Then after that all you need to do is simplify!