anonymous
  • anonymous
Find the sum of an 8-term 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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@superhelp101 @welshfella @paki @butterflydreamer @ganeshie8
anonymous
  • anonymous
you are given a you are given Sn the sum of the terms do you know the formula for the sum of the terms?
anonymous
  • anonymous
Sn = a1 - a1rn/ 1 - r

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anonymous
  • anonymous
what you are not given is r, the common ratio.
anonymous
  • anonymous
Are you sure you weren't given a common ratio, r, in the question?
freckles
  • freckles
\[a,ar,ar^2,ar^3,...,ar^7 \\ \\ \text{ you are given } ar^7=114688 \text{ and } a=7 \\ \text{ so you can find } r \\ \text{ just solve } 7r^7=114688 \text{ for } r \]

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