Fanduekisses
  • Fanduekisses
USE SUMMATION NOTATION TO WRITE THE SUM... pls help!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Fanduekisses
  • Fanduekisses
Fanduekisses
  • Fanduekisses
\[\sum_{n=1}^{??} 10(3)^{n-1}\]
Fanduekisses
  • Fanduekisses
@campbell_st

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Fanduekisses
  • Fanduekisses
idk, I thought setting 7290 = 10(3)^n-1 would help but idk...
anonymous
  • anonymous
looks good to me
anonymous
  • anonymous
oh you need the upper limit right?
Fanduekisses
  • Fanduekisses
yes! ^_^
anonymous
  • anonymous
\[7290=10\times 3^{n-1}\] solve for \(n\) via \[279=3^{n-1}\] then just guess
anonymous
  • anonymous
find a power of 3 that gives \(729\)
Fanduekisses
  • Fanduekisses
ohhhhh 9
anonymous
  • anonymous
oops typo there \[729=3^{n-1}\]
anonymous
  • anonymous
no i don't think so
anonymous
  • anonymous
\(3^8=6561\) too big try a smaller one
Fanduekisses
  • Fanduekisses
the bases have to be the same right?
anonymous
  • anonymous
you are thinking too hard use a calculator \[3^2=9\\ 3^3=27\\ 3^4=81\\ 3^5=...\] keep going until you get it, it will be soon
Fanduekisses
  • Fanduekisses
yeah 3^6
Fanduekisses
  • Fanduekisses
that's why the upper limit is 7
anonymous
  • anonymous
ok so that makes your upper limit 7 i guess
Fanduekisses
  • Fanduekisses
thanks! :)

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