Give examples (pictures may be helpful) of functions from the real numbers to the real numbers that are injective and surjective, surjective but not injective, injective but not surjective, and neither surjective nor injective

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.