Answer:
70.01 ft
Step-by-step explanation:
The angle of depression is 40°, which makes the angle formed by the ground and the line to the tower also 40°.
Since the side opposite of the 40° on the bottom is given, then you can use sine to find how far Ranger Bob is, since the line from him to the tower is the hypotenuse.
Let x = the hypotenuse
sin 40 = 45/x
x = 45/sin 40
x ≈ 70.01 (to the nearest hundredth)
