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January 29, 2015

January 29, 2015

Posted by **Tony** on Tuesday, June 18, 2013 at 10:13am.

- Calculus -
**Steve**, Tuesday, June 18, 2013 at 10:18ama20-a8 = 12d = 60

so, d=5

a12 = a8+4d = 23+20 = 43

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