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Given two terms of the arithmetic sequence, a6=12 and a9 =-6, find a1 and d
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Given two terms of the arithmetic sequence, a6=12 and a9 =-6, find a1 and d

User Zhorian
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ok so... from a9 to a6 it's decreasing by 6 which is -6. D=-6.
a1= 42
User Mohan Kanakala
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