document.write( "Question 1085246: Insert seven arithmetic means between 3 and 23. \n" ); document.write( "
Algebra.Com's Answer #699320 by AnlytcPhil(1806)\"\" \"About 
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document.write( "3, __, __, __, __, __, __, __, 23\r\n" );
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document.write( "There are to be 7 terms between 3 and 23.\r\n" );
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document.write( "That means that the whole sequence is to have 9 terms, \r\n" );
document.write( "when we count the first term 3 and the last term 23.  \r\n" );
document.write( "So n = 9.\r\n" );
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document.write( "an = a1 + (n - 1)d\r\n" );
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document.write( "Substitute:\r\n" );
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document.write( "a1 = first term = 3 \r\n" );
document.write( "n = 9,\r\n" );
document.write( "an = a9 = last term = 23,\r\n" );
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document.write( "23 = 3 + (9 - 1)d\r\n" );
document.write( "23 = 3 + 8d\r\n" );
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document.write( "Subtract 3 from both sides:\r\n" );
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document.write( "20 = 8d\r\n" );
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document.write( "Divide both sides by 8\r\n" );
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document.write( "2.5 = d\r\n" );
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document.write( "So the common difference is d = 2.5,\r\n" );
document.write( "Add 2.5 to the 1st term, getting 3+2.5 = 5.5 for the 2nd term,\r\n" );
document.write( "Add 2.5 to the 2nd term, getting 5.5+2.5 = 8 for the 3rd term.\r\n" );
document.write( "etc., etc.,\r\n" );
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document.write( "3, 5.5, 8, 10.5, 13, 15.5, 18, 20.5, 23\r\n" );
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document.write( "Edwin
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