Answer:
- 508
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 = - 28 and d = - 34 - (- 28) = - 34 + 28 = - 6, thus
[tex]a_{81}[/tex] = - 28 + (- 6 × 80) = - 28 - 480 = - 508