Choose yes or no to tell whether each rate is a unit rate. 1 1 3 2 3 1 2 3 3 1

Option (4). 56.31°

Step-by-step explanation:

From the figure attached,

Distance between the bird and tower (BT) = 6000 feet

Distance between the tower and the observer (OT) = 9000 feet

We have to find the angle of depression (∠TBO)

tanx =

tanx =

tanx = 1.5

x =

x = 56.31°

Angle of depression from the bird to the observer is 56.31°

Option (4) will be the answer.