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whatevs

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

  • 2 years ago
  • 2 years ago

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

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

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

    • 2 years ago
  4. whatevs
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    yes

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

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

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

    • 2 years ago
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