document.write( "Question 971325: Select the option for \"?\" that continues the pattern
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\n" ); document.write( "7,21,8,72,9,? \n" ); document.write( "
Algebra.Com's Answer #593862 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
2,7,26,101,400,?
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document.write( "The recursion formula seems to be:\r\n" );
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document.write( "\"4%2Aa%5Bn%5D-n\"\"%22%22=%22%22\"\"a%5Bn%2B1%5D\"\r\n" );
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document.write( "\"4%2A2-1\"\"%22%22=%22%22\"\"8-1\"\"%22%22=%22%22\"\"7\"\r\n" );
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document.write( "\"4%2A7-2\"\"%22%22=%22%22\"\"28-2\"\"%22%22=%22%22\"\"26\"\r\n" );
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document.write( "\"4%2A26-3\"\"%22%22=%22%22\"\"104-3\"\"%22%22=%22%22\"\"101\"\r\n" );
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document.write( "\"4%2A101-4\"\"%22%22=%22%22\"\"404-4\"\"%22%22=%22%22\"\"400\"\r\n" );
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document.write( "\"4%2A400-5\"\"%22%22=%22%22\"\"1600-5\"\"%22%22=%22%22\"\"1595\"\r\n" );
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document.write( "Answer: 1595\r\n" );
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document.write( "The odd-numbered terms are going 7, 8, 9, 10, ...\r\n" );
document.write( "The even numbered terms are going 16,27, which is 8*2,9*3,so 10*4\r\n" );
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document.write( "Answer: 10*4 = 40\r\n" );
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document.write( "The odd-numbered terms are going 7, 8, 9, 10, ... \r\n" );
document.write( "The even-numbered terms are going 7×3¹, 8×3², 9×3³, 10×3⁵, ..\r\n" );
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document.write( "Answer:  9×3³ = 9×27 = 243\r\n" );
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document.write( "Edwin
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