katiebugg
help?!?!?!?!
find the variables not given
a1 = 10, r = 3, n = 5



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jim_thompson5910
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This looks like a geometric sequence

katiebugg
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it is

jim_thompson5910
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an = a1*r^(n1) is the general formula

jim_thompson5910
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In this case, a1 = 10 and r = 3, so
an = 10*3^(n1)

jim_thompson5910
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the nth term, an, in this case is the 5th term since n = 5
so
a5 = 10*3^(51)

jim_thompson5910
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or an = 10*3^(51) when n = 5

subjectgeek
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High school math or what?

sauravshakya
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so,dw:1343971838905:dw

jim_thompson5910
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does that make sense?

katiebugg
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.... no

jim_thompson5910
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I'm assuming you want to find an right?

jim_thompson5910
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The term \(\Large a_{n}\)

katiebugg
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yess its the one missing

jim_thompson5910
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\[\Large a_{n} = a_{1}r^{n1}\]
\[\Large a_{n} = 10*3^{n1}\]
\[\Large a_{n} = 10*3^{51}\]
I'll let you finish

katiebugg
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lol thanks

jim_thompson5910
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you're welcome, tell me what you get

katiebugg
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810???

jim_thompson5910
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you are correct

katiebugg
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lol yay!!!!!! soo i just do that when looking for then An then lol

jim_thompson5910
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exactly

jim_thompson5910
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\(\Large a_{n}\) is the nth term. So in this case, when n = 5, \(\Large a_{n}\) is the 5th term
Another way to say this \(\Large a_{5}\)

katiebugg
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lol ok