Question

PLEASE HELP IVE BEEN STUCK ON THIS QUESTION FOR 20 MINS IDK :(

Answer 1

remember

`(x^m)/(x^n)=x^(m-n)`
and
if
`a^b=a^c` where a=a, then b=c
so

`(7^9)/(7^n)=7^(9-n)=7^3`

`7^(9-n)=7^3`
so
9-n=3
-n=-6
n=6

answer is 6