## cshalvey 2 years ago Geometry Help for @danielamarques Please!

1. cshalvey

Anyone able to help with how to properly write out the first equation? Thanks everyone! http://assets.openstudy.com/updates/attachments/4ff88fa6e4b058f8b763120d-danielamarques-1341689780965-questions345.png

2. Zarkon

$\sum_{i=1}^{\infty}12\left(\frac{3}{5}\right)^{i-1}$

3. Zarkon

\sum_{i=1}^{\infty}12\left(\frac{3}{5}\right)^{i-1}

4. Zarkon

this is a geometric sum

5. Zarkon

$\sum_{i=1}^{\infty}a\left(r\right)^{i-1}=\frac{a}{1-r}$ for $$|r|<1$$

6. Zarkon

compair your question to what I typed above

7. danielamarques

I'm confused, which question is that one ^

8. Zarkon

that is the sum in question #3 of the file you posted

9. danielamarques

I don't get this at all >.<

10. Zarkon

have you had a lecture on how to computer geometric series?

11. Zarkon

*compute

12. Zarkon