-7x+4= 7x+4
what is the answer.

Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

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

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi