document.write( "Question 1188493: The 20th term is 26 and the common difference is -5. Find the 1st term and 15th term. \n" ); document.write( "

Algebra.Com's Answer #819585 by ikleyn(52803) $\"\"$ $\"About$

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\n" ); document.write( "The 20th term is 26 and the common difference is -5. Find the 1st term and 15th term.
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document.write( " =  + (20-1)*d\r\n" );
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document.write( "26  =   + 19*(-5)\r\n" );
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document.write( "26 - 19*(-5) = \r\n" );
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document.write( "26 + 95 = \r\n" );
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document.write( " = 121.  <<<---===  the 1-st term\r\n" );
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document.write( " =  + (15-1)*(-5)\r\n" );
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document.write( " = 121 + 14*(-5) = 121 - 70 = 51.   <<<---===  .\r\n" );
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document.write( "ANSWER.  1-st term is 121.   15-th therm is  51.\r\n" );
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