Can somebody please help me with this question? I’ll make brainliest

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

How do i put 3(x+7) in distributive property

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42