document.write( "Question 1184341: 1.Find the arithmetic mean between -2,___18
\n" ); document.write( "2.Find the sum of sequence -30,-15,0,15,30,...\r
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Algebra.Com's Answer #814904 by ikleyn(52795) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "1.  The arithmetic mean of the numbers -2 and 18 is half of their sum   =  = 8.\r\n" );
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document.write( "2.  Regarding your sequence, I see 5 terms there  -30, -15, 0, 15, 30.\r\n" );
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document.write( "    Then I see ellipsis, that says me nothing.\r\n" );
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document.write( "    The sum of the five written terms is equal to zero.\r\n" );
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document.write( "    If you mean something different, then take a labor to describe this \"something\" adequately.\r\n" );
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\n" ); document.write( "\n" ); document.write( "For arithmetic sequences, there are well known formulas, written everywhere, in any textbook or in numerous Internet sites.\r
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\n" ); document.write( "\n" ); document.write( "For example, you may look into the lessons\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 and to learn the subject from there . . . \r
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