Answer:
745.5 ft
Explanation:
The mnemonic SOH CAH TOA reminds you of the trig function relating the hypotenuse and the side opposite an angle. It tells you ...
Sin = Opposite/Hypotenuse
The line marked x (the hypotenuse of the triangle) is a transversal crossing the two parallel horizontal lines. That means the interior angle of the triangle at lower right (the angle of elevation) has the measure 28°. That angle is opposite the side marked 350 ft. So, you have ...
sin(28°) = (350 ft)/x
Multiplying by x/sin(28°), this equation becomes ...
x = 350 ft/sin(28°)
x ≈ 745.5 ft