Every time you hand over money to pay for something. You expect the change, so if you hand over a £10 note and bought something for £6 then you subtract 6 from 10 and expect to get £4 in change.
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how are emeralds use in everyday life
Unless your "everyday life" involves work in some area of engineering, you won't use matrices in your everyday life.
you breathe
Some of the mathematicians teach in everyday life or they either just do their job.
We use 99.9 percent of math in our everyday life.