Aboy climbs to the top of a tree and sees his friend 100 feet from the base of the tree. if the tree is 25 feet tall, what is the angle of depression to his friend?

It would be helpful to draw the figure for this system. We would see that a right triangle is made where the base is equal to 100 ft and the height is equal to 25 ft. Using trigonometric functions we can easily calculate for the angle as follows:

tan (theta) = 25 / 100
theta = 14.04 degrees