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OpenStudy (anonymous):
What is the common difference of a 57-term arithmetic sequence where the first term is -25 and the sum is 17,727?
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OpenStudy (anonymous):
17727/57=311 -25+28n=311 28n=336 n=12
OpenStudy (anonymous):
THank you, can you help me wiht one more?
OpenStudy (anonymous):
ok. sure
OpenStudy (anonymous):
What is the sum of a 12-term arithmetic sequence where the last term is 13 and the common difference is -10?
OpenStudy (anonymous):
a1=123 a2=113 a3=103 ... (123+13)(123-13+10)/20=816
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OpenStudy (anonymous):
Thank you so much!
OpenStudy (anonymous):
welcome :)
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