How can a student find how much sand a sandbox can hold if it is 53 inches wide, 62 inches long, and can be filled up to 10 inches deep? A. use (53 × 62 × 10) in3
B. use [2(53) × 2(62) × 2(10)] in3
C. use (53 + 62 + 10) in3
D. use [2(53) + 2(62) + 2(10)] in3

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