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March 26, 2015

March 26, 2015

Posted by **dany** on Saturday, February 9, 2013 at 9:48am.

- arithmetic -
**Elena**, Saturday, February 9, 2013 at 10:49ama(n) = a₁ +(n-1)d

a(6) = a₁ +(6-1)d=12

a(8) = a₁ +(8-1)d=22

a₁ +5d=12

a₁ +7d=22

a₁ = -13

d=5

a(2) = a₁ +(2-1)d=

=-13 +5= =-8

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