2 + (5 + y) it says to simplify the expression.

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

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

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?