is a group of people who agree to save their money together and to make loans to each other at a relatively low rate of interest.  a.  investment firm      b.  mutual fund      c.  commercial bank      d.  credit union

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