HELP ME DUE TODAY CALCULATE THE SLOLE OF THE LINE THAT PASSES THROUGH THE LABELED PONITS ON THE GRAPH

Can you me find the missing length. i attached an image.

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

Paul’s car is 18 feet long. he is making a model of his car that is 1/6 the actual size. what is the length of the model?