## anonymous one year ago What is the sum of the geometric sequence -4, 24, -144, ... if there are 8 terms? (5 points)

1. anonymous

@Owlcoffee

2. Owlcoffee

First find the geometric ratio.

3. anonymous

would that be -4/24?

4. Owlcoffee

yes

5. anonymous

-.167

6. Owlcoffee

Good, now, use the formula for the sum of a finite number of terms: $S_n = \frac{ a_1 (1-r^n) }{ 1-r }$ Where "r" is the ratio, a1 is the first term and "n" the number of the desired terms to add.

7. anonymous

nvm i got it

8. Owlcoffee

well done <3

9. anonymous

ty<3 GIVE ME A MEDAL GAB ):