# math

the ninth term of an arithmetic progression is 52ind the and the sum of the first twelve terms is 414.find the first term and the common difference.

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1. a + 8d = 52

(12/2)(2a + 11d) = 414
or
2a + 11d = 69

solve these two equations for a and d

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2. d=69&a1=2

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