Q = 9000
an
n
1
Q,=?

Answer: B
Step-by-step explanation:
We can note this is a geometric sequence. Rewriting it as an explicit sequence, we get [tex]a_{n}=9000(1/3)^{n-1}[/tex].
So therefore, [tex]a_{7}=9000(1/3)^{7-1}=1000/81[/tex]