the frederick county fair cost $15.00 to get in and $2.50 per ride , while the montgomery county fair costs $10.00 to get in and $3.00 per ride. which equations could be used to determine how many rides you would need to go on for both fairs to be equal value

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