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Equations are used to give a mathematical analysis of events or situations in the real world.
The additive inverse is used to solve equations; equations, in turn, are used to model many real-world situations.
In the real world you can use the order of rational numbers. This is used a lot in math.
about genetic fingerprinting
fingerprinting was first used in 1988 when the DNA fingerprint was first entered into court!
Lessons and training for policemen are not nearly as dangerous as they will be in the real world, with real criminals and real weapons being used indiscriminately and obviously in real life much less controlled situations.
Any situation numbers are used.
your blood
Build a bridge
Maths, Buiseness etc.
In DNA fingerprinting, enzymes are used to cut the DNA in the smaple found at the crime scence