## anonymous 3 years ago Write the sum using summation notation, assuming the suggested pattern continues. 8 - 40 + 200 - 1000 + ...

1. anonymous

Sum (from n=1 to infinitive) (-1)^(n+1)* 8* 5^ (n-1)

2. anonymous

|dw:1365198186404:dw|

3. anonymous

that's what I got. hope this helps :)

4. kropot72

$S _{\infty}=\int\limits_{n=1}^{\infty}8\times (-5)^{n-1}$