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anonymous
 one year ago
Find the sum of an 8term geometric sequence when the first term is 7 and the last term is 114,688 and select the correct answer below.
152,915
16,384
16,377
152,908
anonymous
 one year ago
Find the sum of an 8term geometric sequence when the first term is 7 and the last term is 114,688 and select the correct answer below. 152,915 16,384 16,377 152,908

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SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0have you seen this: \(\large\color{black}{ \displaystyle a_n=a_1\times{\rm r}^{n1} }\) ?

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0\(\large\color{black}{ \displaystyle a_n=a_1\times{\rm r}^{n1} }\) your number of terms is 8 \(\large\color{black}{ \displaystyle a_8=a_1\times{\rm r}^{81} }\) for 8th term. \(\large\color{black}{ \displaystyle a_8=a_1\times{\rm r}^{7} }\) now plug in 8th term and 1st term to find the common ratio. \(\large\color{black}{ \displaystyle 114688=7\times{\rm r}^{7} }\)

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0can you fsolve for common ratio (r) ?

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0don't be silent.... because i can't "talk to a mute".
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