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In the real world you can use the order of rational numbers. This is used a lot in math.
When it tell you what value to round to
some real world problems have more than one answer (output) given one input, these situations can be described by functions
The additive inverse is used to solve equations; equations, in turn, are used to model many real-world situations.
Equations are used to give a mathematical analysis of events or situations in the real world.