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Find the 9th term of the arithmetic sequence. a10 = 100 and a20 = 50; a9 = _____.

Mathematics
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105?
That seems right.
What about this one? Find the 11th term of the arithmetic sequence. a3 = 20.5 and a8 = 13, a11 = ______.

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I did. Can you help with the other one

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