# Math Help - Arithmetic sequence help?

1. ## Arithmetic sequence help?

For the arithmetic sequence 12, 7, 2, -3
A. Find the 5th term: Would that be -8?
B. Find the nth term: would the be an= -5n+17?
C. Find the 200th term:
-5(200)+17= -983. Is that right? Thanks.

2. Originally Posted by rowdy3
For the arithmetic sequence 12, 7, 2, -3
A. Find the 5th term: Would that be -8?
B. Find the nth term: would the be an= -5n+17?
C. Find the 200th term:
-5(200)+17= -983. Is that right? Thanks.
$t_n = a + (n-1)d$ where a is the first term and d is the common difference. Now it's just substitution and arithmetic.

3. Originally Posted by rowdy3
For the arithmetic sequence 12, 7, 2, -3
A. Find the 5th term: Would that be -8?
B. Find the nth term: would the be an= -5n+17?
C. Find the 200th term:
-5(200)+17= -983. Is that right? Thanks.
Yes, those are all correct.