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Math Help - Arithmetic sequence help?

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    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.
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    Quote Originally Posted by rowdy3 View Post
    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.
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    Quote Originally Posted by rowdy3 View Post
    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.
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