document.write( "Question 1099354: How many terms should we add to exceed 2335 when we add - 18 - 11 - 4 ...? \n" ); document.write( "
Algebra.Com's Answer #713786 by Boreal(15235)\"\" \"About 
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2335=(n/2)(a1+an)
\n" ); document.write( "4670=n(a1+an)
\n" ); document.write( "an=a1+d(n-1)=-18+7(n-1)
\n" ); document.write( "substitute
\n" ); document.write( "4670=n(-18+7n-7-18)=-43n+7n^2
\n" ); document.write( "7n^2-43n-4670=0
\n" ); document.write( "n=(1/14)(43+/- sqrt (43^2+28(4670)); sqrt term is equal to 364.16
\n" ); document.write( "n=(1/14)(407.16)=29.08, round up to 30
\n" ); document.write( "an=-18+7(29)=185
\n" ); document.write( "2335<=(29/2)(-18+185)=(14.5*167)=2421.5
\n" ); document.write( "-18
\n" ); document.write( "-11
\n" ); document.write( "-4
\n" ); document.write( "3
\n" ); document.write( "10
\n" ); document.write( "17
\n" ); document.write( "24
\n" ); document.write( "31
\n" ); document.write( "38
\n" ); document.write( "45
\n" ); document.write( "52
\n" ); document.write( "59
\n" ); document.write( "66
\n" ); document.write( "73
\n" ); document.write( "80
\n" ); document.write( "87
\n" ); document.write( "94
\n" ); document.write( "101
\n" ); document.write( "108
\n" ); document.write( "115
\n" ); document.write( "122
\n" ); document.write( "129
\n" ); document.write( "136
\n" ); document.write( "143
\n" ); document.write( "150
\n" ); document.write( "157
\n" ); document.write( "164
\n" ); document.write( "171
\n" ); document.write( "178
\n" ); document.write( "185
\n" ); document.write( "middle is half way between 15th and 16th
\n" ); document.write( "That is 83.5
\n" ); document.write( "multiply that by 30=2505
\n" ); document.write( "sum of first 29 is 2505-185=2325.
\n" ); document.write( "ANSWER IS 30 TERMS\r
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