Posted by **Terry** on Sunday, April 8, 2012 at 2:29pm.

The number of tickets sold each day for an upcoming performance of Handel's Messiah is given by N(x)=-0.6x^2+12+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?

- algebra -
**Henry**, Sunday, April 8, 2012 at 10:33pm
N(x) = -0.6x^x+12x+13.

The above is the Eq of a parabola that

opens downwrd. Therefore, the max point

on the curve is the vertex:

Xv = -b/2a = -12 / -1.2 = 10 = The # of days.

In the original Eq, substitute 10 for

X to get # of tickets sold:

N(x) = (-0.6)10^2 + 12*10 + 13 = 73. =

The # of tickets sold.

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