document.write( "Question 1138280: find the missing term between -5 and -2
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Algebra.Com's Answer #756109 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "find the missing term between \"-5\" and \"-2\"\r
\n" ); document.write( "\n" ); document.write( "if given terms of arithmetic sequence\r
\n" ); document.write( "\n" ); document.write( "\"-5\" ,\"a%5B2%5D\",\"-2\"\r
\n" ); document.write( "\n" ); document.write( "first we need to find common difference \"d\":\r
\n" ); document.write( "\n" ); document.write( "\"a%5B1%5D=-5\"
\n" ); document.write( "\"a%5B3%5D=-2\"\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=a%5B1%5D%2B%28n-1%29d\"\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=-5%2B%28n-1%29d\"\r
\n" ); document.write( "\n" ); document.write( "2nd term is:\r
\n" ); document.write( "\n" ); document.write( "\"a%5B2%5D=-5%2B%282-1%29d\"
\n" ); document.write( "\"a%5B2%5D=-5%2Bd\"........eq.1\r
\n" ); document.write( "\n" ); document.write( "3rd term is:\r
\n" ); document.write( "\n" ); document.write( "\"a%5B3%5D=-5%2B%283-1%29d\"
\n" ); document.write( "\"-2=-5%2B2d\"
\n" ); document.write( "\"-2%2B5=2d\"
\n" ); document.write( "\"2d=3\"
\n" ); document.write( "\"d=3%2F2\"=>common difference\r
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\n" ); document.write( "\n" ); document.write( "and, nth term formula is:\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=-5%2B%28n-1%29%283%2F2%29\"\r
\n" ); document.write( "\n" ); document.write( "then, 2nd (eq.1) term is:\r
\n" ); document.write( "\n" ); document.write( "\"a%5B2%5D=-5%2B3%2F2=+-7%2F2=-3.5\"\r
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\n" ); document.write( "\n" ); document.write( "check all terms:\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=-5%2B%28n-1%29%283%2F2%29\"
\n" ); document.write( "\"n=1\"
\n" ); document.write( "\"a%5B1%5D=-5%2B%281-1%29%283%2F2%29=-5%2B0%283%2F2%29=-5\"\r
\n" ); document.write( "\n" ); document.write( "\"n=2\"
\n" ); document.write( "\"a%5B2%5D=-5%2B%282-1%29%283%2F2%29=-5%2B%283%2F2%29=-7%2F2=-3.5\"\r
\n" ); document.write( "\n" ); document.write( "\"n=3\"
\n" ); document.write( "\"a%5B3%5D=-5%2B%283-1%29d=-5%2B2%2A%283%2F2%29=-2\"\r
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