Which expression demonstrates the distributive property applied to the expression 4(3 + 7)? a) 4 (7+3) b) 4 x 3 x 7 c) 4 x (7 x 3) d) 4 x 3 + 4 x 7

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