Saturday

November 22, 2014

November 22, 2014

Posted by **Laura** on Sunday, October 12, 2008 at 6:27pm.

N(x)= -0.3x^2 + 6x + 15

X represtents the number of days since the concert was first announced. I need to find out when daily ticket sales will peak and how many tickets will be sold on that day. How do i work out this problem I dont know the first place to start! please help.

- Algebra -
**bobpursley**, Sunday, October 12, 2008 at 6:41pmIf you are not in Calculus, then I would graph the equation to find x for the maximum sales.

- Algebra -
**Laura**, Sunday, October 12, 2008 at 6:47pmSo I should find the vertex?

- Algebra -
- Algebra -
**Damon**, Sunday, October 12, 2008 at 6:49pmI assume no calculus, therefore we must look at the shape of this curve.

it is of form ax^2 + bx + c, a parabola

y = -.3 x^2 + 6 x + 15

we need to find the vertex

complete the square

y/-.3 = x^2 +6/-.3 x +15/-.3

x^2 - 20x -50 = -3.33 y

x^2 -20 x = -3.33 y +50

x^2 -20 x +100 = -3.33y +150

(x-10)^2) = -3.33 ( y - 45)

vertex at (10,45)

10 days, 45 tickets

**Answer this Question**

**Related Questions**

Math/Algebra - The number of tickets sold each day for an upcoming performance ...

Algebra 2 - The number of tickets sold each day for an upcoming performance of ...

math - the number of tickets sold each day for an upcoming performance is given ...

algebra - N(x)=-0.6^2+15.6x+12, where x is the number of days since the concert ...

algebra - The number of tickets soldeach day for an upcoming performance of ...

algebra - The number of tickets sold each day for an upcoming performance of ...

algebra - The number of tickets sold each day for upcoming perfomance of Handel'...

college algebra - The number of tickets sold each day for an upcoming ...

music - Anyone been to an concert (jazz, opera, etc.)and had to do a concert ...

Language Arts - 2) Which of the following sentences is punctuated correctly? (...