Use graphs to gain insights into an area and perimeter problem, or use your knowledge of area and perimeter to gain insights into the graphs...
Change one equation in this pair of simultaneous equations very slightly and there is a big change in the solution. Why?
How many intersections do you expect from four straight lines ? Which three lines enclose a triangle with negative co-ordinates for every point ?
Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?
How many eggs should a bird lay to maximise the number of chicks that will hatch? An introduction to optimisation.
When I park my car in Mathstown, there are two car parks to choose from. Which car park should I use?