Can somebody please help me with this please

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

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

What is always true about a positive integer raised to a negative odd power?