A production line produces 3/4 of a mile of yarn every 1/4 hour what is the unit rate of miles of yarn per hour

Ifigured out the question and i dont know what to put here

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?

Solve the equation below: (x+4)/6x=1/x a. x=2 b. x=0,2 c. x=-2 d. x=0,-2