which polynomial correctly combines the like germs and expresses the five polynomial in standard form

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

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