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OpenStudy (anonymous):
The first term of an arithmetic sequence is 12, the seventh term is 36 and the last term is 144. Find the common difference. I am not sure how to do this, please help!
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OpenStudy (welshfella):
fist term = a1 7th term is a1 + 6d where d = common difference so to find d you plug in 12 and 36: 36 = 12 + 6d solve for d
OpenStudy (welshfella):
any questions?
OpenStudy (anonymous):
Ok! No, that explained it perfectly, thank you very much!
OpenStudy (welshfella):
yw
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