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OpenStudy (anonymous):
Find the 9th term of the arithmetic sequence. a3 = 12.2 and a4 = 12.6; a9 = _____.
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OpenStudy (experimentx):
d = a4 - a3 = 0.4 a3 = a1+2d => a1 = 12.2 - 0.4*2 = 11.4 a9 = 11.4+8*0.4
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