Is se x legal if its through goo gle meets/zo om? (serious) here in the uk s*x is illegal because of c_vid

Triangle xyz has vertices x(1,3), y(0,0)

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

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?