Examine whether the following statement pattern is tautology contradiction or contingency, (p → q) ∧ (p ∧ r)

What is the approximate total length of iron edging needed to create the square frame and the two diagonals?

Solve for x i'll try to attach the files bc it's not letting me for some reason

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