Lauren is shopping and finds 6 bracelets, 2 pairs of earrings, and 3 necklaces that she likes. how many ways can lauren select 4 pieces of jewelry to buy? a) 288 b) 330 c) 6,912 d) 7,920 !

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