How do i find the reciprocal to a fraction look at the pitcher by taping it and you can read what it says

Which of the following is correct interpretation of the expression -4+13

Pranza plotted point a in the coordinate plane below.

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