Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?
When I park my car in Mathstown, there are two car parks to choose from. Can you help me to decide which one to use?
How many intersections do you expect from four straight lines ? Which three lines enclose a triangle with negative co-ordinates for every point ?
Change one equation in this pair of simultaneous equations very slightly and there is a big change in the solution. Why?
Is there a temperature at which Celsius and Fahrenheit readings are the same?