Abird (b) is spotted flying 5,000 feet from a tree (t). an observer (o) spots the bird (o) at a distance of 13,000 feet. what is the angle of depression from the bird (b) to the observer (o) ?

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The causes of the failure of the league of nations

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?