Science & Mathematics - 4 December 2007

Can anyone walk me with the follow problem please?

A company can manufacture x items at the cost of c(x) dollars, taken r(x) on these items and realize a profit p(x) = r(x) - c(x) dollars (all amounts in thousands)
Find dc/dt, dr/dt, and dp/dt for the following values of x and dx/dt:

a. r(x) = 9x, c(x) = x^3 - 6x^2 + 15x and dx/dt = .1 when x = 2

2007-12-04 08:15:04 · 2 answers · asked by Anonymous in Mathematics

2007-12-04 08:13:55 · 4 answers · asked by Anonymous in Earth Sciences & Geology

I got 11 out of 16 questions right in a test. How do I find the percentage I got right? When you answer please show me how you got it. Thanks 4 answering!!

2007-12-04 08:13:21 · 10 answers · asked by *Country Girl* 2 in Mathematics

the only issue I am worried about is weight gain and lack of a sex drive....has anyone experienced these as the major side effect?

2007-12-04 08:10:41 · 2 answers · asked by heathermichelle9 5 in Medicine

2007-12-04 08:07:14 · 10 answers · asked by Alexander 6 in Physics

a firm wishes to detemine if there is a linear relationship between the number of TV commercials broadcast and the sales of its product.

the data are as follows:

# commercials (x)
12, 7, 9, 15, 6, 15, 10, 4

sales (y)
9, 7, 12, 13, 8, 11, 7, 6

a) find the equation of the least-squares regression line.
b) approximately how many sales would be predict for 20 tv commercials.

2007-12-04 07:56:43 · 1 answers · asked by Anonymous in Mathematics

2007-12-04 07:47:20 · 3 answers · asked by Anonymous in Mathematics

The Giant's Causeway in N. Ireland is the country's only World Heritage site. It is currently without a visitor centre. The members of the political party DUP want the Creationist side of the story put in with the Causeway formation literature in the new centre. They say it is the result of Noah's flood, I do not understand how a definately volcanic formation of columnar basalt (widely seen in Iceland) could be the result of the flood, can someone from a Creationist background please explain scientifically, and not just say God did it, I want to know how God is supposed to have done it. Thank you.

2007-12-04 07:41:27 · 14 answers · asked by Anonymous in Earth Sciences & Geology

How do I solve the polynomial inequality?!

(x + 3)(x - 6) < 0

2007-12-04 07:35:46 · 1 answers · asked by Babygurl91 1 in Mathematics

Factor completely :
9a^2-100

2007-12-04 07:34:39 · 2 answers · asked by Anonymous in Mathematics

2007-12-04 07:34:27 · 10 answers · asked by Watch it bub! 3 in Astronomy & Space

I have 3 questions

-
Multiply out and simpllify
(x+6)(x-3)

-

Question 2.
Factorise x(^2)-16

-
Question 3
Factorise
x(^2)-5x-14

2007-12-04 07:34:14 · 1 answers · asked by Anonymous in Mathematics

How do i calculate the derivative of
d/dx∫sin^2tdt

the top portion of the integral has a 0 and the bottom has an x.


I'd appreciate any help. Thanks.

2007-12-04 07:33:04 · 4 answers · asked by yefimthegreat 1 in Mathematics

How do I solve this equation by making an appropriate substitution?!

2x - 2√x - 40 = 0

2007-12-04 07:32:37 · 5 answers · asked by Babygurl91 1 in Mathematics

please include some explanation and some steps

2007-12-04 07:30:35 · 5 answers · asked by Anonymous in Mathematics

2007-12-04 07:26:41 · 2 answers · asked by linds<33 2 in Astronomy & Space

2007-12-04 07:25:35 · 2 answers · asked by linds<33 2 in Earth Sciences & Geology

How do I use the quadratic formula to solve this equation?!

x^2 + 8x + 52 = 0

2007-12-04 07:23:57 · 4 answers · asked by Babygurl91 1 in Mathematics

2007-12-04 07:20:40 · 9 answers · asked by modah 1 in Geography

How do I solve the quadratic equation by completing the square?! HELP!

x2 + 6x + 34 = 0

2007-12-04 07:19:18 · 3 answers · asked by Babygurl91 1 in Mathematics

2007-12-04 07:16:50 · 13 answers · asked by Anonymous in Astronomy & Space

2x = 112.5 - 0.5x^2

i know the final answer.. i just need to know how it is done. thanks

2007-12-04 07:14:07 · 9 answers · asked by whoopy_ass 1 in Mathematics

i'm having probs with E creates matter+ matter creates energy, why is there so much excess energy in the universe is the universe mostly energy or mostly matter, could be a serious q, what are the dimensions of energy, or the ratio of energy to matter, anyone?

2007-12-04 07:12:20 · 2 answers · asked by Book of Changes 3 in Physics

2007-12-04 07:11:21 · 4 answers · asked by Anonymous in Mathematics

1.Which force keeps Venus in orbit around the sun?
gravity, friction, hydraulic, buoyancy

2007-12-04 07:08:58 · 10 answers · asked by Anonymous in Astronomy & Space

please help me
i dont understand it

thanks

2007-12-04 07:08:55 · 7 answers · asked by -x-lollie-x- 1 in Mathematics

2007-12-04 07:06:55 · 4 answers · asked by Anonymous in Astronomy & Space

For the floor plans given below, determine whether the side through the points (2, 3) and (11, 6) is perpendicular to the side through the points (2, 3) and (-3, 18).

Floor plans for a building have the four corners of a room located at the points (2, 3), (11, 6), (-3, 18), and (8, 21).

2007-12-04 07:06:19 · 3 answers · asked by Anonymous in Mathematics

Tell me about it!

Cheers!
Christina http://myspace.com/mikepattonisgod

2007-12-04 07:05:49 · 4 answers · asked by Anonymous in Astronomy & Space

Can you belive in both or is it one or the other?

2007-12-04 07:05:29 · 13 answers · asked by remarie84 3 in Biology