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OpenStudy (anonymous):
Find an equation for the nth term of the arithmetic sequence. -15, -6, 3, 12, ...
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OpenStudy (campbell_st):
well you know the 1st term a = -15 and the common difference is d = 9 so the general from is \[a_{n} = -15 + (n -1)\times 9\] distribute the 9 and simplify for the answer.
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