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anonymous

  • one year ago

The first term of an arithmetic sequence is -8 and the common difference is 3. The last term of the sequence is 100. How many terms are there in the sequence? I have been trying to apply a formula that i will post a picture of but its not working, would like some help showing me what to do please!

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  1. anonymous
    • one year ago
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    the formula I tried: \[S _{n}= \frac{ 1 }{ 2 }n \left[ 2a +(n-1)d \right]\]

  2. anonymous
    • one year ago
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    Here was me trying it

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  3. anonymous
    • one year ago
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    do you have answer?

  4. anonymous
    • one year ago
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    i got answer for this but different method

  5. anonymous
    • one year ago
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    I am learning from my textbook and I am pretty sure they want me to use that method to find it since it was in the example, but I am open to learning a different one! The answer is 37.

  6. anonymous
    • one year ago
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    great let me show you the way @Zas

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  7. anonymous
    • one year ago
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    so thing you used there - the a+(n-1)d - that will always work for this type of question?

  8. anonymous
    • one year ago
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    yeah wait i will explain when to use the formula you gave earlier

  9. anonymous
    • one year ago
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    Because I also think that they actually wanted me to use that and I was just doing the wrong thing :)

  10. anonymous
    • one year ago
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    Ok

  11. anonymous
    • one year ago
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    a simple example to show it uses ^_^ hope helps you to understand well

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  12. anonymous
    • one year ago
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    Oh I see, I just used the wrong one didn't I? Oh well, than you very much!

  13. anonymous
    • one year ago
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    no problem im glad i helped you with that question ^_^ dont worry you just need a lot exercise more

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spraguer (Moderator)
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