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anonymous

  • one year ago

Find the sum of the summation of 3 i plus2, from i equals 5 to 13.

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  1. tkhunny
    • one year ago
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    Have you considered substituting the values given for 'i' and adding them up? Are you supposed to use the Arithmetic Series sum formula? Show your work!

  2. anonymous
    • one year ago
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    Sn=n/2(a1+an)?

  3. tkhunny
    • one year ago
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    I'll take that as a 'yes' to the second question. Okay, how do you interpret the formula, in light of the problem statement? What is a1? What is n? What is an?

  4. anonymous
    • one year ago
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    a1=17

  5. anonymous
    • one year ago
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    n=13

  6. anonymous
    • one year ago
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    an is the number youre looking for

  7. tkhunny
    • one year ago
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    a1 = 3*5 + 2 = 15 + 2 = 17 -- Good. n = count(5, 6, 7, 8, 9, 10, 11, 12, 13) = 9 -- Whoops!

  8. anonymous
    • one year ago
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    okay! so thats where i was going wrong

  9. tkhunny
    • one year ago
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    n is the number of terms. Never underestimate the power of simply counting.

  10. anonymous
    • one year ago
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    is the answer 261?

  11. tkhunny
    • one year ago
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    You tell me.

  12. anonymous
    • one year ago
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    |dw:1440127493001:dw|

  13. tkhunny
    • one year ago
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    Done. You are now an expert. Move on to the next one.

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