Respuestas

2012-06-15T21:23:53+02:00

-8,2,12,22,32,42....ratio es de 10... 2-(-8)=10     12-2=10....etc

2012-06-15T21:24:56+02:00

sabemos q

n=17

u=?

r=10

a=-8

u= -8+[10(17-1)]

u=152