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## Homework Statement

actually got two questions but both are related so put them in the same place

the question asks

Determine whether the geometric series is convergent or divergent. If it is convergent, find its sum.

Inf

1.) E 6(0.9)^(n-1)

n=1

Inf (-3)^(n-1)

2.) E ---------------

n=1 4^(n)

the (E) is the sigma sign asking for sum

the Inf is infinity and n = 1 is inital starting point

they want us to evaluate the series sum from 1 to infinity

## The Attempt at a Solution

not really sure where to start. i can figure out the converging or diverging part just plug in some numbers and see if it is getting bigger (going to infinity) or if it leavels off.

not sure how to find the sum.

probaly just a simple formula but the Professor did not give it to us.