Math

How many terms are in the following sequence that follows? 3,7,11,....,439

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asked by Kristen
  1. looks like an arithmetic sequence with
    a = 3
    d = 4
    term(n) = 439
    a + (n-1)d = 439
    3 + (n-1)(4) = 439
    4n - 4 = 436
    4n = 440
    n = 110

    there are 110 terms

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    posted by Reiny
  2. arithmetic sequence
    Xn - a + d(n-1)
    here a = first term = 3
    d = constant difference = 4
    Xn = 439
    so
    439 = 3 + 4(n-1)
    439 = 3 * 4 n - 4
    440 = 4 n
    n = 110

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    posted by Damon

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