At 8: 00 a. m, the outside temperature was -16 . at 9: 00 a. m, the outside temperature dropped 6.5 lower. what was the outside temperature at 9: 00a. m ?

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