Respostas

2013-06-27T16:39:55-03:00

A8 = A1 + 7r

A8 = 2 + 7*3

A8= 23

 

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2013-06-27T16:52:44-03:00

a8= ?

R=3

a1= 2

 

An =  a1+(n-1) R

A8 = 2 + (8-1)3

A8= 2+ 7.3

A8 = 2 +21

A8 = 23