Abag contains 5 blue marbles, 6 red marbles, and 9 green marbles. two marbles are drawn at random, one at a time. what is the probability of selecting a green marble and then, without replacing it, a red marble?

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