document.write( "Question 732802: An arithmetic series has first term 1000 and common difference -1.4. calculate the value of the first negative term of the series, and the sum of all the positive terms \n" ); document.write( "
Algebra.Com's Answer #448070 by mananth(16946) You can put this solution on YOUR website! a= 1000 \n" ); document.write( "d= -1.4\r \n" ); document.write( "\n" ); document.write( "1000/1.4 = 714.29\r \n" ); document.write( "\n" ); document.write( "there are 714.29 =ve numbers \n" ); document.write( "add 1.4 you get 715.69 \n" ); document.write( "so 716th number will bwe negative\r \n" ); document.write( "\n" ); document.write( "t716 = 1000+(716-1)-1.4 \n" ); document.write( "t716 = -1\r \n" ); document.write( "\n" ); document.write( "-1 is the first negative number. \n" ); document.write( "S715 will be the sum\r \n" ); document.write( "\n" ); document.write( "S715 = 715/2[2*1000+714*-1.4]\r \n" ); document.write( "\n" ); document.write( "S715 = 357643 \n" ); document.write( " |