Vector ab has an initial point (4,3) and terminal point (-5,1). determine the coordinates of the terminal point of ac if ac = -2ab a. (-9,-2) b. (18,4) c. (22,7) d. (-4,-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