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anonymous 5 years ago 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?

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1. anonymous

is it $.4x^2+10.4x+13$?

2. anonymous

find the vertex of the equation

3. anonymous

yes

4. anonymous

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

5. anonymous

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

6. anonymous

$-.4x^2+10.4x+13$

7. anonymous

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

8. anonymous

then replace x by 13 and see what you get.

9. anonymous

24.62?

10. anonymous

11.61

11. anonymous

not what i got

12. anonymous

oops i forgot the - sign again!

13. anonymous

i got 80.6 let me try again

14. anonymous

got it twice

15. anonymous

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

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