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11 January, 20:24

Find the 17th term of the of the arithmetic sequence-5,0,5,10

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Answers (2)
  1. 11 January, 20:27
    0
    An=a1+d (n-1)

    first term is - 5 (only way for it to make sense)

    common difference is proabtly 5

    an=-5+5 (n-1)

    17th term

    an=-5+5 (17-1)

    an=-5+5 (16)

    an=-5+80

    an=75

    17th term is 75
  2. 11 January, 20:46
    0
    The n-th term for an arithmetic sequence with a common difference of 5 and a first term of - 5 is given by

    a (n) = - 5 + 5 (n-1)

    or

    a (n) = 5n - 10

    The 17th term is found by evaluating this for n=17.

    a17 = 5·17 - 10

    a17 = 75
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