Question

What is the sum of a 7–term geometric series if the first term is –11, the last term is –45,056, and the common ratio is –4?

Answer 1

i got -36,047?

Answer 2

sum of n terms

= a (r^n - 1)
-----
( r - 1)

= -11 * ((- 4)^7 - 1)
---------
- 4 - 1

Answer 3

thank you so much for showing me how.

Answer 4

can i ask your help with one more?

Answer 5

i get that -36047

Answer 6

i might have time so try me

Answer 7

What is the sum of the geometric sequence –4, 24, –144, … if there are 7 terms?

Answer 8

thank you so much!