maygenllsn800 maygenllsn800
  • 09-02-2018
  • Mathematics
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The second term of an arithmetic sequence is 7, the sum of the first four terms in the arithmetic sequence is 12, find the first term and the common difference

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evgeniylevi
evgeniylevi evgeniylevi
  • 12-02-2018
Consider the following short explanation.
Answer: a1=15; d= -8.
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