I walk on them. I live in them. I eat with them and I am partly made of them.
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I live in a solid. I am sitting on a solid and am wearing solids. My eyesight is helped by solids as my fingers tap on different solids and I monitor the results on another solid. That should be enough to get you started.
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.