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29 April, 14:03

The 80th term of an arithmetic sequence is twice the 30th term. If the first term of the sequence is 7, what is the 40th term?

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  1. 29 April, 14:26
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    It seems that "d" or the common difference is a number that makes the sequence go into the larger positive realm of numbers. Therefore, 2 * (7+30d) = 7+80d. d=35/100. Now just do 7 + 40 (35/100) = 21. 21 is your answer!
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