A tree casts a shadow that is 20 feet long. If the distance from the top of the tree to the edge of the shadow is 45 feet, what is the angle of elevation from the end of the shadow to the top of the tree?

Suppose you are analyzing the relationship between time and distance given in a table,and there are 4 values for each quantity.you divide distance 2 minus distance 1 by time 2 minus time 1.you then divide distance 4 minus distance 3 by time 4 minus time 3 and get a different answer.what can you say about the relationship?