this is hard to explain because I can't post pictures of the two graphs, but I tried to draw them in paint. Here are the graphs: http://img.photobucket.com/albums/v629/ussjt/math.jpg 1) the question asks estimate f '(0), f '(2), f '(5), f '(7) when looking at at graph how do you determine the f '? I am confused about how to going about finding it. 2) at what points does the derivative exist? (how can you determine this?) then sketch the derivative of s(the y-axis) (confused by the meaning) Any help would be great.