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What is the first term if the 10th term of an arithmetic sequence is 39 and the 15th term is 59

 Aug 19, 2020
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10th term + 5 d = 15th term

39 + 5d = 59

d = 4

 10th term - 9d = first term

  39    - 9(5) = .......

 Aug 19, 2020

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