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the highest or lowest point on a parabola, depending on whether the graph is ∩-shaped or ∪-shaped. It is also known as the turning point of the parabola, as at this point where the gradient of the graph is zero.
a statistical average; the sum of all the values divided by the number of values.
a model generated using objects or diagrams to understand and solve problems.
(N) all the counting numbers, starting at 1: N = {1, 2, 3, 4, 5, ...}