The set of ordered pairs represents a function. write a rule that represents a function.
(0256)

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters

Find the quotient with the restriction.