Question

help please

Answer 1

http://www.regentsprep.org/Regents/math/algtrig/ATP2/GeoSeq.htm

gives the formulas for the sum of the sequence with number of terms.

\(\LARGE\color{blue}{ \bf S_{n}=\frac{ a_1(1-r^{n}) }{1-r } }\)

Answer 2

i did that and my answer wasn't one of the options?

Answer 3

options . your work and what you got . Please show me both.

Answer 4

it works never mind sorry i looked at it wrong