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January 28, 2015

January 28, 2015

Posted by **linda** on Tuesday, February 7, 2012 at 9:17am.

- arithmetic -
**Anonymous**, Tuesday, February 7, 2012 at 11:57amI assume you are referring to an arithmetic sequence.

a+2d + a+3d = 44

a+9d + a+14d = 203

2a + 5d = 44

2a + 23d = 203

18d = 159

d = 159/18

a = -1/12

S20 = 20/2(T1+T20)

= 167.75

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