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to write an expression as a product of its factors.
the general increase in prices, linked to a decrease in the purchasing value of money.
a number which combined with its inverse results in the identity 1, e.g. 4 × ¼ = 1.
the highest or lowest point on a parabola, depending on whether the graph is ∩-shaped or ∪-...
a test that determines whether or not a given graph represents a function.