document.write( "Question 309682: N(x)=0.4x^2+8.8x+11
\n" ); document.write( "x=days
\n" ); document.write( "Peak sales of tickets will be on what day and how many tickets are sold that day? \n" ); document.write( "

Algebra.Com's Answer #221491 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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N(x)=-0.4x^2+8.8x+11 (coefficient of x^2 has to be negative)
\n" ); document.write( "x=days
\n" ); document.write( "Peak sales of tickets will be on what day and how many tickets are sold that day?
\n" ); document.write( ":
\n" ); document.write( "This is a quadratic equation, find the axis of symmetry to find the day of max sales
\n" ); document.write( "Use the formula: x = -b/(2a), in this equation a=-.4, b=8.8
\n" ); document.write( "x = $\"%28-8.8%29%2F%282%2A-.4%29\"$
\n" ); document.write( "x = $\"%28-8.8%29%2F%28-.8%29\"$
\n" ); document.write( "x = +11th day will be peak sales
\n" ); document.write( ":
\n" ); document.write( "Find the no. of sales on that day
\n" ); document.write( "N(x) = -0.4x^2 + 8.8x + 11
\n" ); document.write( "Replace x with 11
\n" ); document.write( "N(11) = -0.4(11^2) + 8.8(11) + 11
\n" ); document.write( "N(11) = -0.4(121) + 96.8 + 11
\n" ); document.write( "N(11) = -48.4 + 96.8 + 11
\n" ); document.write( "N(11) = 59.4 ~ 59 tickets sold on the 11th day \n" ); document.write( "

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