anonymous
  • anonymous
A partial sum of an arithmetic sequence is given. Find the sum. 4 + 9 + 14 + . . . + 484 need help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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...
anonymous
  • anonymous
(Where a = first term, l = last term, n = number)
anonymous
  • anonymous
I cant find n though

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anonymous
  • anonymous
Hint: The nth term = (n-1)d, so 484 = (n-1)*4 => n-1 = 484/4
anonymous
  • anonymous
sorry, not 4 :/
anonymous
  • anonymous
a+(n-1)d ***
anonymous
  • anonymous
=>484 = 4 + (n-1)*5
anonymous
  • anonymous
so n is 121. because 484/4= 121
anonymous
  • anonymous
No sorry I misread it, see the post below.
anonymous
  • anonymous
the post below??
anonymous
  • anonymous
a+(n-1)d =>484 = 4 + (n-1)*5

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