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anonymous

  • 5 years ago

A partial sum of an arithmetic sequence is given. Find the sum. 4 + 9 + 14 + . . . + 484 need help

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  1. anonymous
    • 5 years ago
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    The sum forumla you may find useful is \[S_n = \frac{1}{2} \cdot n(a+l) \] You just need to find the number of terms...

  2. anonymous
    • 5 years ago
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    (Where a = first term, l = last term, n = number)

  3. anonymous
    • 5 years ago
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    I cant find n though

  4. anonymous
    • 5 years ago
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    Hint: The nth term = (n-1)d, so 484 = (n-1)*4 => n-1 = 484/4

  5. anonymous
    • 5 years ago
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    sorry, not 4 :/

  6. anonymous
    • 5 years ago
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    a+(n-1)d ***

  7. anonymous
    • 5 years ago
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    =>484 = 4 + (n-1)*5

  8. anonymous
    • 5 years ago
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    so n is 121. because 484/4= 121

  9. anonymous
    • 5 years ago
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    No sorry I misread it, see the post below.

  10. anonymous
    • 5 years ago
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    the post below??

  11. anonymous
    • 5 years ago
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    a+(n-1)d =>484 = 4 + (n-1)*5

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