document.write( "Question 732951: what expression represents the sum of the first n multiples of 15 ? \n" ); document.write( "

Algebra.Com's Answer #852816 by ikleyn(53427) $\"\"$ $\"About$

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\n" ); document.write( "what expression represents the sum of the first n multiples of 15 ?
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document.write( "These multiples form arithmetic progression \r\n" );
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document.write( "    N(k) = 15k,  k = 1, 2, 3, . . . , n.\r\n" );
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document.write( "First term is 15, the common difference is 15.\r\n" );
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document.write( "The sum of the first n terms is\r\n" );
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document.write( "    15*(1 + 2 + 3 + . . . + n) = .   ANSWER\r\n" );
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