Andrew can paint a 15 ft. by 18 ft. wall in 35 minutes. he had to paint ten of these walls in his house. if he started at 1: 00 p. m., what time will andrew finish?

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