Question

Determine if the sequence is arithmetic. If it is, find the term named in the problem.

-25, -17,-9,-1, ...
Find a39
Your answer:
O a39 = - 293
O a39 = - 291
O a39 = 241
a39 = 279

How do you solve this problem

Answer 1

`a_(39)` = 279

Explanation:

`a_(n)` =
`a_(1)` + (n - 1)d

d =
`a_(2)` -
`a_(1)`

~~~~~~~~~

d = - 17 + 25 = - 9 + 17 = - 1 + 9 = 8

`a_(39)` = - 25 + 8(39 - 1) = 279

`a_(39)` = 279