Answer:
see explanation
Step-by-step explanation:
The n th term of an arithmetic sequence is
[tex]a_{n}[/tex] = a₁ + (n - 1)d
where a₁ is the first term and d the common difference
here a₁ = 9 and d = - 2, hence
[tex]a_{n}[/tex] = 9 -2(n - 1) = 9 - 2n + 2 = - 2n + 11
[tex]a_{n}[/tex] = - 2n + 11 ← n th term formula
