Question

How do I find the 4th partial sum for this sequence? (Problem attached below)

Answer 1

what is the first term?
and 2nd, 3rd and 4th?
just plug in values for n

Answer 2

Is that really it? Just plug in the 4th value? Or plug in 1 through 4?

Answer 3

1 through 4 then add them up

Answer 4

oh, so it's the same as a Sigma sort of, just written differently.
That's ridiculously unnecessary and frustrating, gah. Thanks a million sir.

Answer 5

this is a geometric sequence with first term -1 and common difference 2

Answer 6

yw

Answer 7

first term -3