document.write( "Question 1113288: A theater has 40 rows with 26 seats in the first​ row, 31 in the second​ row, 36 in the third​ row, and so forth. How many seats are in the​ theater? \n" ); document.write( "
Algebra.Com's Answer #728292 by mananth(16946)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "A theater has 40 rows with 26 seats in the first​ row, 31 in the second​ row, 36 in the third​ row, and so forth. \r
\n" ); document.write( "\n" ); document.write( "There is an arithmetic sequence in seats arrangement.\r
\n" ); document.write( "\n" ); document.write( "first term a = 26
\n" ); document.write( "difference = 5 ( between consecutive rows)
\n" ); document.write( "number of rows =40\r
\n" ); document.write( "\n" ); document.write( "Total seats = Sn sum of all terms\r
\n" ); document.write( "\n" ); document.write( "Use formula for sum of n terms\r
\n" ); document.write( "\n" ); document.write( "\"Sn=%28n%2F2%29%282a+%2B%28n-1%29%2Ad%29\"\r
\n" ); document.write( "\n" ); document.write( "Plug the values and get the total seats =4940 seats\r
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