Plan A charges you $18 a month to be a member and then $2 per movie. Plan B charges you $6 a month to be a member and then $4 per movie. How many movies would you have to download for the cost to be the same? What would the cost be?

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