document.write( "Question 1126515: Find S10 for the series 2 + 7 + 12 + 17 +... \n" ); document.write( "
Algebra.Com's Answer #742893 by ikleyn(52788)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "            Let me re-formulate the question / the problem in more clear way:\r
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document.write( "            Find the sum S10 of the first 10 members of the sequence  2, 7, 12, 17, . . . \r\n" );
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document.write( "It is an arithmetic progression with the first term of 2 and the common difference of 5.\r\n" );
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document.write( "The sum of the first 10 terms is  \"S%5B10%5D\" = \"%282+%2B+%289%2A5%29%2F2%29%2A10\" = (2+22.5)*10 = 24.5*10 = 245.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Answer. 245.\r
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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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