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December 19, 2014

December 19, 2014

Posted by **Anonymous** on Sunday, October 9, 2011 at 1:38pm.

- arithmetic -
**Steve**, Sunday, October 9, 2011 at 11:50pmThe nth term of a linear sequence is a + (n-1)d

T1 + T4 = a + a+3d = 10

T3 + T7 = a+2d + a+6d = 20

2a + 3d = 10

2a + 8d = 20

5d = 10

d=2

a=2

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