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21-11-2017
Mathematics

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The last term of an arithmetic sequence is 25, the common difference is 4, and the number of the terms is 9. What is the first term?

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UnaYeungii UnaYeungii

21-11-2017

If you start at 25 and count down by 4, 8 times the answer you get is negative seven. so; -7, -3, 1, 5, 9, 13, 17, 21, 25.

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