[b]1)[/b] Consider the steepness of the curve at each of the labelled points. Is it positive/negative, large/small? Are any gradients easier to estimate than others?[br][br][b]2)[/b] You could plot a tangent line to better visualise the gradients. Drag the point across the curve to change where the tangent touches the curve.[br][br][b]3)[/b] Check your answers and refresh the page to change the graph when you are happy with your estimates. What has all this got to do with calculus?[br][br][b]Summarise any key points at the bottom of the page.[/b]