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

Answer 1

Do you know Calculus?
If so, find the derivative, set it equal to zero and solve for x
evaluate f(x) for the given x you found

if not

complete the square, sort of messy with these numbers.