Asked by Jack

The number of tickets soldeach day for an upcoming performance of Handiel Messiah is given by N(x)=-0.4x^2+9.6x+10,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.
Answered by bobpursley
Treat the equation as a parabola, find its vertex. When? what is the axis of symettry?