Respostas

2014-03-19T19:39:34-03:00
An = a1 + (n – 1) * r
a7 = -73 + (7-1)*r
-49 = -73 + (6r
-49 + 73 = 6r
24 = 6r
r = 24/6
r = 4


1 4 1