Sketch the graph of F(x).

You are not serious, are you?

F(x) can be any function. You would have to tell us what it is.

We don't plot graphs here, anyway.

There are websites that do that for you, such as
http://rechneronline.de/function-graphs/

It would the the function F(x) defined in a previous post:
http://www.jiskha.com/display.cgi?id=1298565394

The graph is a straight line between the origin and (4000,80000), and is a horizontal line beyond that.