SOLUTION: What is the common difference of a 57-term arithmetic sequence where the first term is -25 and the sum is 17,727?
11
11.5
12
12.5
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Question 772954: What is the common difference of a 57-term arithmetic sequence where the first term is -25 and the sum is 17,727?
11
11.5
12
12.5
Answer by josgarithmetic(39625) (Show Source): You can put this solution on YOUR website!
Your general term is with common difference d, and for the sum of the terms,
For the LastTerm, you know n=57 but still not know d. This term is like,
Put this all into the sum equation and as n=57.
Solve for d.
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