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Water, oxygen, electricity
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.
We can use technology in everyday life by using it properly. You must think first what would be the effect of that technology to the people and the environment. Use it only if necessary and with appropriate purpose. And don't used technology that exploit and destroy our environment.
There are a countless number of ways people use 20. For example, they could be counting 20 nickles in a dollar.