The equation represents an ellipse. which points are the foci of the ellipse? (−16, −6) and (14, −6) (−10, −6) and (8, −6) (−1, −18) and (−1, 6) (−1, −15) and (−1, 3)

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