People use powers in math because it is easier to write 2 to the power of 10 than writing 2x2x2x2x2x2x2x2x2x2.
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The same reason that people of other countries use maths.
For the same reasons that we need to use maths today.
good maths =)
Everywhere everyday you use maths for
if your a maths teacher or anything to do with maths.