document.write( "Question 625276: The number of tickets sold each day for an upcoming performance of Handel's Messiah is given by N(x)= -0.4x^2+8x+15, where x is the number of days since the concert was first announced. When will daily tickets sales peak and how many tickets will be sold that day?\r
\n" ); document.write( "\n" ); document.write( "Tickets sales will peak ? days after the concert was first announced.
\n" ); document.write( "The number of tickets sold on that day will be ?
\n" ); document.write( "(Round to the nearest integer)
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Algebra.Com's Answer #393415 by nerdybill(7384)\"\" \"About 
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The number of tickets sold each day for an upcoming performance of Handel's Messiah is given by N(x)= -0.4x^2+8x+15, where x is the number of days since the concert was first announced.
\n" ); document.write( "When will daily tickets sales peak and how many tickets will be sold that day?
\n" ); document.write( "Tickets sales will peak ? days after the concert was first announced.
\n" ); document.write( "The vertex defines the peak sales:
\n" ); document.write( "x = -b/(2a)
\n" ); document.write( "x = -8/(2(-0.4))
\n" ); document.write( "x = -8/(-0.8)
\n" ); document.write( "x = 10 days
\n" ); document.write( "The number of tickets sold on that day will be ?
\n" ); document.write( "plug x=10 back into original equation:
\n" ); document.write( "N(10)= -0.4(10)^2+8(10)+15
\n" ); document.write( "N(10)= -0.4(100)+(80)+15
\n" ); document.write( "N(10)= -40+80+15
\n" ); document.write( "N(10)= 40+15
\n" ); document.write( "N(10)= 55 tickets\r
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