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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 -

    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 -

    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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