What is 4995 rounded to the nearest ten

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?