Question

Sigma & expanded notation help!
Medal & Fannn!

Answer 1

` HINT: ` Recall that \(\displaystyle \sum_{n=0}^\infty x^n = \dfrac{1}{1-x}\)

Here, we have \(x = 3/4\)

Answer 2

Also you can factor 5 out; \[\sum_{n=0}^\infty 5x^n = 5\sum_{n=0}^\infty x^n\]

Answer 3

okay. so i figured out the expanded form... now how would i figure out the sum?

Answer 4

when i add them i get 13.6719. And i know that is not right, so i must be doing something wrong...

Answer 5

answer was C