Two lines are graphed on a coordinate graph. If the lines are parallel, which statement must be true? A. The lines have the same y-intercept.
B. The lines have the same slope.
C. The lines have the same x-intercept.
D. The slopes have a product of -1

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