I need help thank you

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

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

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x