The diagram shows the locations of john and mark in relationship to the top of a tall building labeled a. a) describe < 4 as it relates to the situation b) describe < 3 as it relates to the situation

Given that the diagram shows the location of John and Mark in relationship to the top of the building labeled A, then:
a]
∠4 is the angle of elevation as seen by Mark from his location. It is the angle between the horizontal and the line from the object to the observer's eyes.

b]
∠3 is the angle of depression and it is congruent to the angle 5, which is the angle of elevation as seen by John from his location.  

than do 23.50 times 18 and then divide your answer by 100 than you will get x.