document.write( "Question 1023888: Given the sequence 4;X-2;32...\r
\n" ); document.write( "\n" ); document.write( "1.1 Which term of the sequence is 158?
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Algebra.Com's Answer #639387 by MathLover1(20849)\"\" \"About 
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Given the sequence \"4\",\"x-2\",\"32\",............,\"a%5Bn%5D\"\r
\n" ); document.write( "\n" ); document.write( "first find \"x\" using common difference rule:\r
\n" ); document.write( "\n" ); document.write( "\"d=%28x-2%29-4=x-6\"...eq.1
\n" ); document.write( "\"d=32-%28x-2%29=32-x%2B2=34-x\".....eq.2\r
\n" ); document.write( "\n" ); document.write( "from eq.1 and eq.2 we have:\r
\n" ); document.write( "\n" ); document.write( "\"x-6=34-x\"
\n" ); document.write( "\"2x=34%2B6\"
\n" ); document.write( "\"2x=40\"
\n" ); document.write( "\"x=20\"\r
\n" ); document.write( "\n" ); document.write( "so, your sequence is:\r
\n" ); document.write( "\n" ); document.write( "\"4\",\"%2820-2%29\",\"32\",............,\"a%5Bn%5D\" or \"4\",\"18\",\"32\",............,\"a%5Bn%5D\"\r
\n" ); document.write( "\n" ); document.write( "the common difference is \"d=x-6=20-6=14\"\r
\n" ); document.write( "\n" ); document.write( " to find any term of an arithmetic sequence:\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=a%5B1%5D%2B%28n-1%29d\" where \"a%5B1%5D\" is the first term of the sequence, \"d\" is the common difference, \"n\" is the number of the term to find.\r
\n" ); document.write( "\n" ); document.write( "your formula will be:\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D=4%2B14%28n-1%29\" for \"n\"=\"1\",\"2\",\"3\",.........\r
\n" ); document.write( "\n" ); document.write( "if \"a%5Bn%5D=158\", then\r
\n" ); document.write( "\n" ); document.write( "\"158=4%2B14%28n-1%29\"\r
\n" ); document.write( "\n" ); document.write( "\"158-4=14%28n-1%29\"\r
\n" ); document.write( "\n" ); document.write( "\"154%2F14=n-1\"\r
\n" ); document.write( "\n" ); document.write( "\"11=n-1\"\r
\n" ); document.write( "\n" ); document.write( "\"n=11%2B1\"\r
\n" ); document.write( "\n" ); document.write( "\"n=12\"\r
\n" ); document.write( "\n" ); document.write( "\"n=36\"\r
\n" ); document.write( "\n" ); document.write( "so, \"12th\" element of your sequence is \"158\"\r
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