document.write( "Question 1151998: 1.Find the sum of 60 terms.
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Algebra.Com's Answer #773915 by greenestamps(13200) $\"\"$ $\"About$

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document.write( "5+5(1/2)+6+6(1/2)+...+34+34(1/2)  [60 terms]\r\n" );
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document.write( "=5(1.5)+6(1.5)+...+34(1.5)  [30 terms]\r\n" );
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document.write( "= (5+6+...+34)(1.5)\r\n" );
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document.write( "= ((30)(5+34)/2)(1.5)   [number of terms, times average of first and last, because the sequence is arithmetic]\r\n" );
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document.write( "= 585(1.5) = 877.5

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