What would be the slope for this problem?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

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

‼️‼️‼️10 points‼️‼️‼️ me it’s important‼️‼️‼️‼️‼️