Graphic addition is an exercise concerning the
graphical recognition of the addition of functions of one real variable.

The server will give you the graph of two functions f (x) and g(x),
whose expressions
will be hidden. You will then be presented a certain number of other graphs,
corresponding to functions such as f (x)+g(x), f (-x)-g(x),
-f (x)+g(-x), etc (see the menu below). And you should locate the one
which corresponds to one which will be precised in a question.
To give the reply, you can simply click on the graph which you believe to be
the good one.