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whatevs

  • 4 years ago

What is the sum of a 23–term arithmetic sequence where the first term is 9 and the last term is 141?

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  1. strayfire
    • 4 years ago
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    not sure on this one...do you have an answer key you can check...im getting 1131.78

  2. whatevs
    • 4 years ago
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    No I dont have an answer key..its ok..

  3. Maph
    • 4 years ago
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    9+15+21+....+141...right?

  4. whatevs
    • 4 years ago
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    yes

  5. whatevs
    • 4 years ago
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    so what would be the sum?

  6. Maph
    • 4 years ago
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    i can't figure out what the general sum would look like :(

  7. Maph
    • 4 years ago
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    just add em all up i guess lol

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