document.write( "Question 851700: The number of seats in the first 12 rows of a high school auditorium from an arithmetic sequence. The first row has 9 seats. The second row has 11 seats.
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\n" ); document.write( "\n" ); document.write( "a) Write a recursive formula to represent the sequence.
\n" ); document.write( "b) Write an explicit formula to represent the sequence.
\n" ); document.write( "c) How many seats are in the 12th row? \n" ); document.write( "
Algebra.Com's Answer #513103 by richwmiller(17219)\"\" \"About 
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The number of seats in the first 12 rows of a high school auditorium from an arithmetic sequence. The first row has 9 seats. The second row has 11 seats.
\n" ); document.write( "Show all work.
\n" ); document.write( "a) Write a recursive formula to represent the sequence.
\n" ); document.write( "b) Write an explicit formula to represent the sequence.
\n" ); document.write( "c) How many seats are in the 12th row?
\n" ); document.write( "an = a1 + (n - 1)d
\n" ); document.write( "a12 = 9 + 2(11)
\n" ); document.write( "a12=31 seats in the 12th row
\n" ); document.write( "an = 9 + 2(n - 1)
\n" ); document.write( "An=9+2n-2
\n" ); document.write( "An=2n+7 explicit \r
\n" ); document.write( "\n" ); document.write( "an = a(n-1) + 2 recursive \r
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