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OpenStudy (anonymous):
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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OpenStudy (anonymous):
not sure on this one...do you have an answer key you can check...im getting 1131.78
OpenStudy (anonymous):
No I dont have an answer key..its ok..
OpenStudy (anonymous):
9+15+21+....+141...right?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
so what would be the sum?
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OpenStudy (anonymous):
i can't figure out what the general sum would look like :(
OpenStudy (anonymous):
just add em all up i guess lol
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