Answer:
a₈₇ = 497
Step-by-step explanation:
The nth 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 = - 19 and d = a₂ - a₁ = - 13 - (- 19) = - 13 + 19 = 6 , then
a₈₇ = - 19 + (86 × 6) = - 19 + 516 = 497
