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

12-02-2018

Consider the following short explanation.
Answer: a1=15; d= -8.

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