The 7th term of an arithmetic sequence is 21, and the tenth term is 126. Find th



Answered question


In an arithmetic sequence, the seventh term is 21 and the tenth term is 126. locate the first term?

Answer & Explanation



Skilled2021-08-18Added 96 answers

The answer is -189. The difference between each term is 35 because 126 - 21 = 105. 1053 (because of the difference between 7 and 10) = 35 and then you would have to 35×(6) to go back to the first term . With that you would get -210 and then you would have to add 21 because of where you started at (7th term).

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