Question

The number of tickets sold each day for an upcoming performance of Handel's Messiah is given by N(x)=-0.4x^2+10.4x+13, 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

is it \[.4x^2+10.4x+13\]?

Answer 2

find the vertex of the equation

Answer 3

yes

Answer 4

if so max is given when \[x=\frac{-b}{2a}\] what mr orchestra said

Answer 5

i get -13 but i must have read it wrong . oh wait

Answer 6

\[-.4x^2+10.4x+13\]

Answer 7

\[\frac{-b}{2a}=\frac{-10.4}{2\times -.4}=13\]

Answer 8

then replace x by 13 and see what you get.

Answer 9

24.62?

Answer 10

11.61

Answer 11

not what i got

Answer 12

oops i forgot the - sign again!

Answer 13

i got 80.6 let me try again

Answer 14

got it twice

Answer 15

I will keep trying I'm not sure what I'm doing wrong