Please give the answer! thank you!! <3 :D

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?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles