document.write( "Question 880991: how many terms of the series 4+6+8+10... add to 180 \n" ); document.write( "

Algebra.Com's Answer #531890 by josgarithmetic(39617) $\"\"$ $\"About$

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General term, $\"4%2B%28n-1%29%2A2\"$ .\r
\n" ); document.write( "\n" ); document.write( "Series, $\"%28n%2F2%29%284%2B4%2B%28n-1%29%2A2%29=180\"$ , and you can either derive the formula or refer to any suitable reference source.
\n" ); document.write( " $\"%28n%2F2%29%288%2B2n-2%29=180\"$
\n" ); document.write( " $\"n%286%2B2n%29=360\"$
\n" ); document.write( " $\"2n%5E2%2B6n-360=0\"$
\n" ); document.write( " $\"highlight_green%28n%5E2%2B3n-180=0%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28%28n-12%29%28n%2B15%29=0%29\"$
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\n" ); document.write( "TWELVE TERMS. \n" ); document.write( "

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