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September 18, 2014

September 18, 2014

Posted by **payal** on Tuesday, October 13, 2009 at 7:08am.

- arithmetic -
**Reiny**, Tuesday, October 13, 2009 at 8:30amAssuming you are working with arithmetic sequences,

term(4) = a+3d = 20

term(7) = a+6d = 32

subtract the two equations:

3d = 12

d = 4

sub back into either top equation to find a

term(n) = a + (n-1)d

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