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- Dec 6th 2007, 10:07 PMoceanmdFind 10th term
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- Dec 6th 2007, 10:42 PMjanvdl
Problem 1

$\displaystyle r = 2 ; a = 7$

$\displaystyle T_{n} = ar^{n - 1}$

$\displaystyle T_{10} = (7)(2)^{10 - 1}$

$\displaystyle = (7)(2^9)$

$\displaystyle = 3584$

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Problem 2

$\displaystyle S_{n} = \frac{ a( 1 - r^n ) }{ 1 - r }$

$\displaystyle S_{5} = \frac{ 3( 1 - (-1,5)^5 ) }{ 1 - (-1,5) }$

$\displaystyle S_{5} = \frac{165}{16}$