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OpenStudy (anonymous):
simplify z^-4/z^-9 would it be z^36?
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OpenStudy (anonymous):
a^x/a^y=a^x-y
OpenStudy (anonymous):
Now can you answer ?!:)
OpenStudy (anonymous):
uhm.. z^-13
OpenStudy (anonymous):
oops I meant z^5?
OpenStudy (anonymous):
Exacly ! Its realy true !
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OpenStudy (anonymous):
so that's right?
OpenStudy (anonymous):
Yeah !
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