The number of tickets sold each day for an upcoming performance of Handel's Messial is given by N(x)=-0.5x^2+13+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?

Question

anonymous · Answer

wow this makes number 12 at least

anonymous · Answer

max at 
$$-\frac{b}{2a}=-\frac{13}{2\times (-.5)}=13$$

anonymous · Answer

day thirteen is the most, and you sell whatever you get when you replace x by 13

saifoo.khan · Answer

lol,
she wrote
-0.5x^2 + 13 + 12.

anonymous · Answer

i am assuming it was 
$$N(x)=-0.5x^2+13x+12$$

saifoo.khan · Answer

Forget the "x".

anonymous · Answer

So what will be the number of tickets sold on the 13th day?

saifoo.khan · Answer

insert x = 13
96.5 
which means 97