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

whatevs
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No I dont have an answer key..its ok..

Maph
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9+15+21+....+141...right?

whatevs
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yes

whatevs
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so what would be the sum?

Maph
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i can't figure out what the general sum would look like :(

Maph
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just add em all up i guess lol