Need Help ASAP just trying to complete it before the deadline

The rumpart family is building a new room onto their house. the width of the new room will be 16 feet. the length of the room will be 4% greater than the width. write an expression to find the length of the new room. what will be the area of this new room?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Can someone me out here and the tell me the greatest common factor