document.write( "Question 1136211: Write an explicit formula for the sequence -13 , -6 , 1 , 8 \n" ); document.write( "
Algebra.Com's Answer #753981 by ikleyn(52814)\"\" \"About 
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document.write( "    \"a%5Bn%5D\" = -13 + (n-1)*7,   n = 1, 2, 3, 4, . . . \r\n" );
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document.write( "or,  equivalently\r\n" );
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document.write( "    \"a%5Bn%5D\" = -20 + 7n,   n = 1, 2, 3, 4, . . . \r\n" );
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document.write( "It is an arithmetic progression with the first term of -13 and the common difference of 7.\r\n" );
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\n" ); document.write( "\n" ); document.write( "For introductory lessons on arithmetic progressions see \r
\n" ); document.write( "\n" ); document.write( "    - Arithmetic progressions\r
\n" ); document.write( "\n" ); document.write( "    - The proofs of the formulas for arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    - Problems on arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    - Word problems on arithmetic progressions\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Also,  you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Arithmetic progressions\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-II
\n" ); document.write( "https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "into your archive and use when it is needed.\r
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