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OpenStudy (anonymous):
Find the 11th term of the arithmetic sequence. a3 = 20.5 and a8 = 13, a11 = ______.
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OpenStudy (anonymous):
we have:\[a_n=a_0+(n-1)d\] \[a_3=20.5=a_0+2d\] and \[a_8=13=a_0+7d\] solve simultaneously to obtain a_0 and d
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