arianamedina200 arianamedina200
  • 25-08-2017
  • Mathematics
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PLEASE HELP IVE BEEN STUCK ON THIS QUESTION FOR 20 MINS IDK :(

PLEASE HELP IVE BEEN STUCK ON THIS QUESTION FOR 20 MINS IDK class=

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apologiabiology
apologiabiology apologiabiology
  • 25-08-2017
remember
[tex]\frac{x^m}{x^n}=x^{m-n}[/tex]
and
if [tex]a^b=a^c[/tex] where a=a, then b=c
so
[tex]\frac{7^9}{7^n}=7^{9-n}=7^3[/tex]
[tex]7^{9-n}=7^3[/tex]
so
9-n=3
-n=-6
n=6

answer is 6
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