Respostas

2013-11-19T19:37:46-02:00
A_1 = 34
n = 6
a_6 = ?
r = 34 - 40 = - 6

a_6 = 34 + (6 - 1)*(- 6) = 34 - 30 = 4
a_6 = 4 km
1 5 1
2013-11-19T19:45:16-02:00
A1= 40 km
a2= 34 km

r=a2-a1
r=34-40
r=-6

an=a1+(N-1).r
a6=40+(6-1).(-6)
a6=40+5.(-6)
a6=40-30
a6=10 km
3 4 3