document.write( "Question 1120037: if s=1/2n(2a+(n-1)d) then what d=?
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Algebra.Com's Answer #735690 by josgarithmetic(39618) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "What is that?\r
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\n" ); document.write( "\n" ); document.write( " $\"s=%281%2F2%29n%282a%2B%28n-1%29d%29\"$ ?\r
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\n" ); document.write( "\n" ); document.write( " $\"s=%281%2F%282n%29%29%282a%2B%28n-1%29d%29\"$ ?\r
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\n" ); document.write( "\n" ); document.write( " $\"s=1%2F%282n%282a%2B%28n-1%29d%29%29\"$ ? \n" ); document.write( "

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