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'Guessing the Graph' printed from https://nrich.maths.org/
Can you find a quadratic curve that roughly fits Data Set A?
Where do you think the maximum point of the curve would be?
Consider how to turn the graph of $y=x^2$ upside down, move it up
the axis, and 'squash' it to match the data.
This
spreadsheet might be
useful for trying out equations and seeing how closely they match
the real data.