100 POINTS JUST PLEASE ANSWER ALL AND SHOW WORK PLZZ PLEASE
(this is not free points)

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

Which of the following best describes the figure?

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.