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post the screenshot please

i dont know how to do screen shot

thanks

okay now i know

each term is found by multiplying the previous term by -3

3*(-3) = -9
-9*(-3) = 27
27*(-3) = -81
etc etc

yeah

generate the first 8 terms, then add them up

okay hold on lets see

-4920

alternatively, you can use this formula
\[\Large S_n = a*\frac{1-r^n}{1-r}\]

yeah thats what its says to use

yeah it's -4920

okay lets see ill send you a screen shot if its wrong okay

you are amazing

ok I'm glad that one worked

okay i have another

i have a question are you a teacher for algebra

because you seem to know what your doing

yes I've had lots and lots of practice

sweet heres the other question

this is a geometric series
what's the first term? common ratio?

1/3

first term = 1/3, yes

its going up in numerator x2 denomanator x3

common ratio = -2/3

okay

so its diverge

right

Rule:
if |r| < 1, then the series converges
otherwise, the series diverges

okay so its fixed sum is 1/5

if you generated all of the terms and added them up, they would add up to 1/5

okay

so converges are out right

what do you mean? I wrote above that the series converges

since |r|<1