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22 April, 13:08

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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  1. 22 April, 14:59
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    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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