Sooo just like everyone else except TREY PERRIN, I failed that chapter 13 test. I actually thought i knew chapter 13 until I got that test so I guess i'm kinda upset. But what's a better way to learn than to blog about it! yayyyy, so i'll talk about 13-5 since i found that one not as bad.

it's all about the sum of an infinite geometric.

FORMULA:
sn=t1/1-r

writing a repeating decimal as a fraction is my favorite!

FORMULA:
#thats repeating/last place-1

EXAMPLES:
find the sum of the infinite geometric series.
9-6+4-....
*plug into your formula
sn=9/1-2/3
your answer is 27/5

write .2525 as a fraction
*plug into formula
25/100-1
your answer is 25/99