document.write( "Question 1210345: THE 2ND AND 7TH TERM OF A G.P ARE 18 AND 4374 RESPECTIVELY. FIND THE
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Algebra.Com's Answer #851977 by mccravyedwin(407)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Now I'll assume the student meant\r\n" );
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document.write( "THE 2ND AND 7TH TERM OF AN A.P ARE 18 AND 4374 RESPECTIVELY. FIND THE \r\n" );
document.write( "1) COMMON DIFFERENCE \r\n" );
document.write( "2) FIRST TERM \r\n" );
document.write( "3) SUM OF THE 4TH AND 8TH TERM\r\n" );
document.write( "4) SUM OF THE FIRST 10 TERMS\r\n" );
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document.write( "I'll use \"a%5Bn%5D=a%5B1%5D%2B%28n-1%29d\"\r\n" );
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document.write( "1) COMMON DIFFERENCE \r\n" );
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document.write( "\"a%5B2%5D=a%5B1%5D%2B%282-1%29d=a%5B1%5D%2Bd=18\"\r\n" );
document.write( "\"a%5B7%5D=a%5B1%5D%2B%287-1%29d=a%5B1%5D%2B%287-1%29d=a%5B1%5D%2B6d=4374\"\r\n" );
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document.write( "Subtract the first equation term-by-term from the second equation.\r\n" );
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document.write( "\"%28a%5B1%5D%2B6d%29-%28a%5B1%5D%2Bd%29=4374-18\"\r\n" );
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document.write( "\"5d=4356\"\r\n" );
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document.write( "\"d+=+4356%2F5%29\"\r\n" );
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document.write( "\"d+=+871.2\"\r\n" );
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document.write( "2) FIRST TERM \r\n" );
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document.write( "\"a%2Bd=18\"\r\n" );
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document.write( "\"a%5B1%5D%2B871.2=18\"\r\n" );
document.write( "\"a%5B1%5D=18-871.2\"\r\n" );
document.write( "\"a%5B1%5D=-853.2\"\r\n" );
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document.write( "3) SUM OF THE 4TH AND 8TH TERM\r\n" );
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document.write( "Using \"a%5Bn%5D=a%5B1%5D%2B%28n-1%29d\"\r\n" );
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document.write( "\"a%5B4%5D=a%5B1%5D%2B%284-1%29%2A871.2=-853.2%2B3%2A871.2=-853.2%2B2613.6=1760.4\"\r\n" );
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document.write( "\"a%5B8%5D=a%5B1%5D%2B%288-1%29%2A871.2=-853.2%2B7%2A871.2=-853.2+%2B+6098.4=5245.2\" \r\n" );
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document.write( "\"a%5B4%5D%2Ba%5B8%5D=+1760.4%2B5245.2=7005.6\"\r\n" );
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document.write( "4) SUM OF THE FIRST 10 TERMS\r\n" );
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document.write( "\"S%5Bn%5D=expr%28n%2F2%29%282a%5B1%5D%2B%28n-1%29d%29\"\r\n" );
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document.write( "\"S%5B10%5D=5%28-1706.4%2B7840.8%29%29\"\r\n" );
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document.write( "\"S%5B10%5D=5%286134.4%29=30672\"\r\n" );
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document.write( "Edwin
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