document.write( "Question 1106609: S = n/2[2a +(n - 1)d].\r
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Algebra.Com's Answer #721615 by ikleyn(52781) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Step 1.  Divide both sides by .   You will get    = 2a + (n-1)*d,   or    = 2a + (n-1)*d.    (1)\r\n" );
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document.write( "Step 2.  In (1),  subtract (n-1)*d from both sides.  You will get   2a =  - .                  (2)\r\n" );
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document.write( "Step 3.  In (2), divide both sides by 2 and get the   ANSWER   a =  - .\r\n" );
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