What is the balue of x in the proportion 2 1/4 / x= 1 1/2/3/35?

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Someone . me. compound probability

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