document.write( "Question 860678: find the sum of the first eight terms in the series -4+8-16+… \n" ); document.write( "
Algebra.Com's Answer #518594 by richwmiller(17219)\"\" \"About 
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S=t*(1 - r^n)/(1 - r)
\n" ); document.write( "r=-2
\n" ); document.write( "S=-4*(1 - (-2)^8)/(1 - (-2))
\n" ); document.write( "S = 340
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