Science & Mathematics - 7 November 2007

find x:(a)3:2=5:x
b)4:3=x:4
c)x:7=1:2
and

find each ratio in the form 1:n,giving n to 3 significant figures where necessary:
a)25:10000
b)2:15

please can you tell me how you got the answers and tell me the workings.Thank you.

2007-11-07 05:30:34 · 5 answers · asked by Anonymous in Mathematics

(x^2y^-2/z^-2)^-1

2007-11-07 05:29:27 · 4 answers · asked by Anonymous in Mathematics

2007-11-07 05:28:19 · 8 answers · asked by Anonymous in Mathematics

Hey, I've got a math test on Friday and I can't figure out how to find the area of a cardioid by double integration. The instructions for the problem read: Find the indicated area by double integration in polar coordinates. And the problem is 3. The area bounded by the cardioid r=1+cos(theta) . Thanks in advance.

2007-11-07 05:25:09 · 2 answers · asked by Anonymous in Mathematics

The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.9% of the anion radius and the distance between the cation nuclei is 580. pm, what are the radii of the two ions? (Note: This ionic compound is a three dimensional array. The cation to cation, center-to-center distance specified is through the center of the anion.)
anion

cation

Will give 10 points to right answer

2007-11-07 05:25:00 · 1 answers · asked by jnester0289 1 in Chemistry

2007-11-07 05:22:56 · 2 answers · asked by David L L 2 in Physics

2007-11-07 05:16:08 · 9 answers · asked by garrett i 1 in Engineering

2007-11-07 05:11:14 · 7 answers · asked by Anonymous in Geography

Could someone please help me with this one math question please?? Describe a process for finding the measure of angle 2. here is a picture of what I'm looking at..

http://i24.tinypic.com/33vhukh.jpg

2007-11-07 05:07:01 · 8 answers · asked by Anonymous in Mathematics

if any one could solve this i will be happy if he / she write all the steps ... :)

2007-11-07 04:59:14 · 1 answers · asked by Anonymous in Mathematics

(x-10)(x-2)= -20

I am getting as far as

x^2 - 12x +20 = -20

x^2 -12x + 40 = 0

2007-11-07 04:53:37 · 7 answers · asked by Anonymous in Mathematics

2007-11-07 04:52:25 · 7 answers · asked by adams girl 2 in Botany

2007-11-07 04:51:01 · 1 answers · asked by Anonymous in Chemistry

it has to do with something about convection and conduction
a)cavity wall insulation
b)Loft Insulation
c)Hot water tank jacket

2007-11-07 04:44:16 · 2 answers · asked by Anonymous in Engineering

2007-11-07 04:42:53 · 3 answers · asked by babygirl_04052005 1 in Biology

This question was asked in the cooking section last year, but it wasn't really resolved. Last night, I was making guacamole and all I had were frozen onions and I didn't want to take the time to thaw them naturally, so I microwaved some chopped onion on a paper plate. A couple of bits started sparking and popping so much that they were a little charred. The onions were not in the microwave for long (30 seconds). Does anybody have any idea what causes this?

2007-11-07 04:38:49 · 11 answers · asked by fire_n_ice723 3 in Chemistry

For a cell rap

2007-11-07 04:34:48 · 7 answers · asked by Anonymous in Biology

three 7 lb. 12 oz
1. 19 lbs.
2. 21 lbs. 12 oz.
3. 23 lbs. 4 oz.
4. 23 lbs. 12 oz.

2007-11-07 04:28:09 · 24 answers · asked by Anonymous in Mathematics

____ occur(s) because photons we receive from the edge of the solar disk are emitted further from the base of the photosphere than the photons we receive from the center of the solar disk.



a. The Zeeman Effect
b. Sunspots
c. Solar flares
d. Solar prominences
e. Limb darkening

2007-11-07 04:28:06 · 1 answers · asked by blaze w 1 in Astronomy & Space

answer:

kcurt egabrag a

2007-11-07 04:26:45 · 3 answers · asked by Anonymous in Zoology

2007-11-07 04:25:03 · 17 answers · asked by Anonymous in Zoology

I've been working on this problem for like 3 hours, and cannot figure it out. i can do every problem on the page EXCEPT this one. help please lol...

give all positive values of the angle between 0 and 360 degrees to satisfy the equation:
cos2x - sin^2 x/2 + 3/4 = 0

please show me how you did it so I know for future. thanks tons.

2007-11-07 04:23:32 · 4 answers · asked by Fundamenta- list Militant Atheist 5 in Mathematics

In an aortic aneurysm, a bulge forms where the walls of the aorta are weakened. If blood flowing through the aorta (radius 1.0 cm) enters an aneurysm with a radius of 3.1 cm, how much on average is the blood pressure higher inside the aneurysm than the pressure in the unenlarged part of the aorta? The average flow rate through the aorta is 110 cm3/s. Assume the blood is non-viscous and the patient is lying down so there is no change in height.
___ Pa

2007-11-07 04:20:35 · 2 answers · asked by Pr0ject 1 in Physics

dollars when t = 0 and t is time in years. Suppose Q =1. How fast (in cents/year) are prices rising when t = 10?

2007-11-07 04:08:23 · 2 answers · asked by simonkf2002 1 in Mathematics

*square root*[7x + 29]= x+3

2007-11-07 04:00:52 · 4 answers · asked by Anonymous in Mathematics

2007-11-07 03:59:12 · 9 answers · asked by nightsky 1 in Astronomy & Space

The text reads: In 1967, females constituted 13 percent of all juvenile index crime arrest; today they make up about one third. Can someone please do the math for me b/c i dont know.

I guess the question is asking what is one third of 13

2007-11-07 03:57:42 · 2 answers · asked by pete 1 in Mathematics

Because we could be and we could not be and both ideas are over whelming

2007-11-07 03:57:20 · 7 answers · asked by Dani 2 in Astronomy & Space

i need to know for my science show

2007-11-07 03:56:40 · 3 answers · asked by Anonymous in Physics

A rod suspended on its end and acting as a physical pendulum swings with a period of 2.26 s. What is its length? (g = 9.80 m/s^2)

2007-11-07 03:48:22 · 2 answers · asked by Jerry M 1 in Physics