Can you sketch these difficult curves, which have uses in mathematical modelling?

Sketch the members of the family of graphs given by y = a^3/(x^2+a^2) for a=1, 2 and 3.

Investigate the family of graphs given by the equation x^3+y^3=3axy for different values of the constant a.

Can you construct a cubic equation with a certain distance between its turning points?

Consider these analogies for helping to understand key concepts in calculus.

Find the relationship between the locations of points of inflection, maxima and minima of functions.

What is the quickest route across a ploughed field when your speed around the edge is greater?

A point moves on a line segment. A function depends on the position of the point. Where do you expect the point to be for a minimum of this function to occur.

How many eggs should a bird lay to maximise the number of chicks that will hatch? An introduction to optimisation.