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OpenStudy (anonymous):
the 13th term of an arithmetic sequence is 69. The common difference is 7. What is the first term of the sequence? Show all work.
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OpenStudy (anonymous):
What's the formula to find the nth-term?
OpenStudy (experimentx):
the nth tern is given by tn = a + (n-1)d your n=13, tn = 69, d = 7 or, 69 = a + 12*7 or a = 69 - 84 = -15
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