What is 3 divided by 2/3? How many 2/3's are in 3?

THIS IS TIMED HELP!!!

Which of the following graphs represents the function f(x) = 2^x

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

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