@GabrielDuquette Difference/change. So Δx = difference between two values of x. If apples cost 32 cents yesterday, 30 today, Δprice = -2.
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@GabrielDuquette Difference/change. So Δx = difference between two values of x. If apples cost 32 cents yesterday, 30 today, Δprice = -2.