document.write( "Question 436833: The number of tickets sold each day for an upcoming event is given by N(x)=-0.5x^2+13x+13, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold that day \n" ); document.write( "
Algebra.Com's Answer #302333 by ankor@dixie-net.com(22740)\"\" \"About 
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The number of tickets sold each day for an upcoming event is given by N(x)=-0.5x^2+13x+13,
\n" ); document.write( " where x is the number of days since the concert was first announced.
\n" ); document.write( " When will daily ticket sales peak and how many tickets will be sold that day
\n" ); document.write( ":
\n" ); document.write( "N(x)=-0.5x^2+13x+13 is a quadratic equation, max sales occur at the axis of symmetry
\n" ); document.write( "Find the axis symmetry with the formula x = -b/(2a)
\n" ); document.write( "In this equation: a=-.5, b=13
\n" ); document.write( "x = \"%28-13%29%2F%282%2A-.5%29\"
\n" ); document.write( "x = +13 days after announced it will be at peak sales
\n" ); document.write( ":
\n" ); document.write( "Find peak sales, replace x with 13
\n" ); document.write( "N(x)=-0.5(13^2)+13(13)+13
\n" ); document.write( "N(13) = -84.5 + 269 + 13
\n" ); document.write( "N(13) ~ 97 ticket sold on that day \n" ); document.write( "
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