Respostas

2013-12-02T17:26:06-02:00
A) An=a1 + (n-1 ) . r
An= 2 + 5n - 5
An= 5n - 3

b) An=a1 + (n - 1 ) , r
   An = 3 + ( n - 1 ) . 3
   An = 3 + 3n - 3
An = 3n