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function as in: a mathematical function

What is the function to calculate how much carpet is required to cover a rectangular room of a given length and width?

a formula or mathematical expression that describes a relationship between variables

Function has many reasonably common, but highly diverse senses. Accordingly, it is generally recommended that you just learn the sense (or senses) that currently interest you.

What is the function to calculate how much carpet is required to cover a rectangular room of a given length and width?

Do you remember the function to calculate the area of a circle from its radius?

Since there is less oxygen at high altitudes, to know how much oxygen is available at the top of any mountain, you will need a function that converts altitude to available oxygen.