you listen to it. you can listen to CD or cassete.
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They are used to reflect radio waves to improve long distance communications and they are used for GPS location systems
how are emeralds use in everyday life
-- pocket radio -- LED flashlight -- LED ("digital") clock -- speed-radar detector -- cellphone -- computer power supply
Unless your "everyday life" involves work in some area of engineering, you won't use matrices in your everyday life.
Geometry is used in my everyday life because I see it everyday. Everything I see is practically geometry. There are posters on my classroom wall, there are desks and chairs, tables, and a big nice white board. I guess this is really how I used geometry in my everyday life.