Posted by **lisa** on Saturday, December 17, 2011 at 11:43pm.

N(x)=-0.6^2+15.6x+12, 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

ticket sales peak-

number of tickets sold-

- algebra -
**Damon**, Sunday, December 18, 2011 at 4:34am
assume you mean:

N(x)= -0.6 x^2 + 15.6 x + 12

+0.6 x^2 - 15.6 x = -N + 12

x^2 - 26 x = -1.6666 N + 20

x^2 - 26 x + 169 = -1.6666 N + 189

(x-13)^2 = -1.6666 N + 189

(x-13)^2 = -1.6666 (N - 113.4)

13 days and 113 tickets

- algebra -
**Damon**, Sunday, December 18, 2011 at 4:36am
If you know calculus

dN/dx = 0 at max = -1.2 x + 15.6

1.2 x = 15.6

x = 13

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