Find the length of the third side of 26 and 10

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

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

Felix wrote several equations and determined that only one of the equations has no solution. which of these equations has no solution?