Science & Mathematics - 13 October 2007

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Just to make it easier to understand...
These are the points:
A (-2, 0)
B (0, 2)
C (2, 0)
D (0, -2)

And I thought the answer to this was 16,
But the correct answer is 8√2
And I don't understand why.

2007-10-13 13:35:12 · 9 answers · asked by The Girl 2 in Mathematics

I'm really having trouble with these two proofs. Can anyone solve these two? It would be greatly appreciated! I'm having trouble getting one side to equal the other.

1.) (sinθ -1)(tanθ + secθ ) = -cosθ

2.) cos B cot B = csc B - sin B

2007-10-13 13:34:33 · 3 answers · asked by neverisenough 1 in Mathematics

2007-10-13 13:29:49 · 1 answers · asked by Anonymous in Chemistry

2007-10-13 13:27:23 · 1 answers · asked by Anonymous in Chemistry

I did a lab experiment with an unknown solution. I noticed that my solution had a sweet scent and I noticed that the solution has a boiling point near the same boiling point as Toluene. I was wondering if Toluene has a sweet smell?

2007-10-13 13:26:00 · 4 answers · asked by Emma H. 1 in Chemistry

2007-10-13 13:25:23 · 1 answers · asked by Anonymous in Chemistry

2007-10-13 13:23:38 · 3 answers · asked by Anonymous in Chemistry

2007-10-13 13:23:30 · 11 answers · asked by Mary L 2 in Mathematics

Acetaldehydy, Ch3CHO, (d= 0.788 g/ml) a liquid used in the manufacture of perfumes, flavors, dyes, and plactics, can be produced by the reaction of ethanol with oxygen.

CH3CH2CHO + O2 ------------------> CH3CHO + H2O (Unbalance)

How many liters of liquid ethanol (d-0.789) must be consumed to produce 25.0L of acetaldehyde

2007-10-13 13:20:29 · 1 answers · asked by evilshenanegans 1 in Chemistry

3h2t + 6ht + 3t
Help me please

2007-10-13 13:17:49 · 4 answers · asked by mormar 1 in Mathematics

Dog breeds exist because humans basically forced them to evolve aka bred them. Now there are breeds that look VERY different from each other, yet they are still the same species. So how could the dog breeds evolve so much through the accelerated evolution that humans forced upon them but still all be the same species?

2007-10-13 13:13:50 · 12 answers · asked by Anonymous in Biology

fast, easy, way, to clean about 200 ft of 100 pair phone wire?
know burning it, but thats not legal, plus i live in town.

yes, i did get it legal. its old, not in on continuious run, my superviorsor okayed it.

help please?
thanks

2007-10-13 13:10:34 · 4 answers · asked by Anonymous in Other - Science

A sample of NiCl*H2O is found experimentally to contain 0.0116 moles of H2O, 0.0055 moles of Ni, and 0.00121 moles of Cl. What is the molecular formula of NiCl*H2O? How can I calculate it?

In the actual question, it says Ni(subscript x)Cl(subscript y) * zH2O, but i dont really think those are important. And does anyone know why they are there or why the z is infront of the water molecule and not a subscript?

2007-10-13 13:09:20 · 4 answers · asked by Jamie 3 in Chemistry

Some ingredients break our skin out and I would like to know exactly what the heck it is before I purchase them. There are also generics on the market but none of the boxes tell exactly whats it is! Some just say latex free, some say natural rubber latex and so on. It's aggrivating....I can't find this information on Google, Yahoo etc. It seems almost top secret! If anyone can find links on the technical ingredients can they please post them so I can read about it. My family would appreciate it!

Is it the same as the adhesive used on bandaid bandages, I think it is different.

2007-10-13 13:08:39 · 3 answers · asked by char__c is a good cooker 7 in Chemistry

2007-10-13 13:08:31 · 3 answers · asked by App Master 1 in Mathematics

a / a-7 minus 10 / a+9 plus a-9 / a^2+2a-63

2007-10-13 13:07:14 · 2 answers · asked by Anonymous in Mathematics

A long straight wire is carrying a current of 2.4 A in a region where the magnetic field is perpendicular to the wire. If the magnetic field is 0.52 mT, what is the magnitude of the force on 3.0 m of the wire??

a) 1.2 * 10^-3 N
b) 3.7 * 10^-3 N
c) 7.2 * 10^-3 N
d) 3.7 N
E) 7.2 N

please help and explain thanks

2007-10-13 13:06:47 · 1 answers · asked by Anonymous in Physics

2ln(4)-ln(8)

and

3ln(2)-ln(1/2)

2007-10-13 13:05:27 · 1 answers · asked by Anonymous in Mathematics

an electron is moving at 2.5 * 10^6 m/s perpendicular to a 3.5 mT magnetic field. What is the radius of its path?

a) 5.1 cm
b) 3.9 cm
c) 1.6 cm
d) 4.1 cm
e) 2.0 cm

please help and explain thanks

2007-10-13 13:01:11 · 2 answers · asked by Anonymous in Physics

I ma from the UK and I have been reffered by my doctor to general medicine at my local hospital to investigate various unexplained symptoms I was wondering what can i expect to happen at this appointment? can they run tests such as scans ? like if i said i get strange headaches will i get an mri scan there and then? or will it just be like a visit to a doctor and a general chat and pyshical?

2007-10-13 12:54:55 · 1 answers · asked by Anonymous in Medicine

I need to pull the tape apart and be able to measure the distance?

2007-10-13 12:54:15 · 2 answers · asked by bitsbacon13 1 in Other - Alternative

The fermentation of glucose, which occurs primarily when the glucose concentration is high or when oxygen is not available. The cells attain a maximum specific growth rate of about 0.45 hr-1 with a low biomass yield of 0.15 g dry mass per gram glucose consumed and a high respiratory quotient (the ratio of CO2 production rate to the O2 consumption rate) and a low energy yield of only about 2 ATP per mole of glucose metabolized. The stoichiometry of this reaction is

2007-10-13 12:53:08 · 2 answers · asked by Anonymous in Chemistry

Find an equation of the line containing the given pair of points.

(-5, -8) and (-1, -2)

The equation of the line is y=

**************************************************

2007-10-13 12:52:39 · 5 answers · asked by iwishiwereanangel 3 in Mathematics

Solve, for the equation 3 cos^2x + 10 sinx cosx = 0

when x is between 0 and 360 degrees ( inclusive of 0 and 360 degrees)

Pls show your workings...and explain too..tks a lot

2007-10-13 12:47:05 · 3 answers · asked by Anonymous in Mathematics

Pension fund investments

A pension fund has decided to invest $45,000 in the two high-yield stocks:

Duke Energy Corp with a share price of $14 and yield return of 8%.

Eastman Kodak with a share price of $30 and yield return of 6%.

This pension fund has decided to invest at least 25% of the $45,000 in each of the two stocks. Further, it has been decided that at most 63% of the $45,000 can be invested in either one of the stocks. How many shares of each stock should be purchased in order to maximize the annual yield, while meeting the stipulated requirements? what is the annual yield in dollars for the optimal investment plan?

2007-10-13 12:45:11 · 3 answers · asked by w s 3 in Mathematics

2007-10-13 12:41:59 · 13 answers · asked by Anonymous in Medicine

What is the weater suppose to be tomorrow?(Sunday)Need to know asap!!!!

~Thanks~

2007-10-13 12:41:56 · 10 answers · asked by Anonymous in Weather

2007-10-13 12:40:20 · 10 answers · asked by Ptericytol 1 in Astronomy & Space

find an equation of the line containing the given pair of points (2,1) and (6,4)

Again working with my son on algebra problems and have not been able to get this one. He has it done I just dont know if it is right, lol. Can someone help?

2007-10-13 12:36:55 · 11 answers · asked by iwishiwereanangel 3 in Mathematics

I have two questions I'm absolutely stuck on. Any help would be much appreciated!!

1. Find the slope of the tangent line at the point P
y = a^2 / (a^2+x^2) .... P(a, 1/2)

and this next one is going to be challenging to type...

2. What is the value of:
http://i179.photobucket.com/albums/w293/controldeficit/calculus.gif
(since I couldn't type that out).

2007-10-13 12:33:56 · 3 answers · asked by Riot Act 1 in Mathematics