I need help pronto {(2,2,),(-5,2),(6,6),(9,4),(4,9)} is it a function and explain please

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

What is the length of ac in the given triangle?