Help me please me find what X =

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

What is coefficient of the term of degree of degree 5 in the polynomial below

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