Science & Mathematics - 20 November 2007

2007-11-20 16:31:07 · 4 answers · asked by Deborah J 1 in Mathematics

i dont understand how this works.. if someone can show me how, and also why it works..that would be awesome.

1. CO2
2. CO
3. SO2
4. SO3
5. N2O
6. NO
7. N2O3
8. NO2
9. N2O4
10. N2O5
11. PCl3 (chlorine)
12. PCl5 (chlorine)
13. NH3
14. SCl6 (chlorine)
15. P2O5
16. CCl4 (chlorine)
17. SiO2
18. CS2
19. OF2
20. PBr2

2007-11-20 16:28:57 · 1 answers · asked by Anonymous in Chemistry

hey everyone
I completely forget how to find the horizontal asymptotes for a function.
the specific function I need asymptotes for is:

9x2 – 36 / x2 - 9
(the x's are squared, it wouldn't let me type it with exponents)
I know how to get vertical asymptotes...but if anyone wants to do a little math or at least remind me how to get horizontal asymptotes, that would be great
thanks!

2007-11-20 16:26:12 · 4 answers · asked by COXIE 3 in Mathematics

i keep getting this problem wrong every time i redo it

19-5x/2=34

and should x= 6


and another one is:

41x-(-33)-25x=-145

and should x= -7


just wondering if this r right or lose?!?

2007-11-20 16:22:50 · 6 answers · asked by swift 1 in Mathematics

Im a Uruguayan citizen and never hear much about my country around the world. I would like to know how many people know this country and what they know about it. Thanks.

2007-11-20 16:21:32 · 6 answers · asked by Anonymous in Geography

2007-11-20 16:17:52 · 2 answers · asked by Khalid 1 in Mathematics

3x ^4

2007-11-20 16:16:18 · 4 answers · asked by Anonymous in Mathematics

As a child in the 60's and 70's, I recall massive swarms of these around lights at night where I lived. Most people in the area also notice they have rarely seen the once common beetles in recent years also.

Is this just a local dramatic population decrease, or has something happened across their entire range? If so, any ideas what we did?

2007-11-20 16:12:26 · 2 answers · asked by Sp. Gr. 0.98 3 in Zoology

2007-11-20 16:11:36 · 1 answers · asked by honey 3 in Chemistry

√(1+8v) - 2 = v
√(x-6) = 3 + √x

*everything in the parenthesis is in the radical

2007-11-20 16:09:47 · 4 answers · asked by Anonymous in Mathematics

First, Calculate the wavelength of the light that corresponds to the transition of the electron from the n=4 to n=2 state of the hydrogen atom. Is the light absorbed or emitted??? (1.0967 for transition)


What is the energy of the single electron in a hydrogen atom when it is in the n=4 state??? Is it (-2.178 x 10^ -18 / 16)
Not sure how, though!!!!Explain, please!!!!

Which of the following could be the quantum numbers (n l m(subscript l) m(subscript s) for the valence electron in a potassium atom in its ground state!!!!!! Explain, please!!!

2007-11-20 16:04:45 · 1 answers · asked by Doc. Ock 3 in Chemistry

2007-11-20 16:04:30 · 1 answers · asked by Anonymous in Chemistry

Is this how the jews lf old lived hundreds of years (supposedly), or how "miracle" healing occurs?

2007-11-20 16:02:40 · 3 answers · asked by Anonymous in Biology

The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0*10^-17 J of energy to trigger a series of impulses that eventually reach the brain.

(a) How many photons of red light (660 nm) are needed?

(b) How many photons of blue light (475 nm) are needed?

2007-11-20 16:00:08 · 1 answers · asked by Ruby Winter 2 in Chemistry

2007-11-20 15:58:46 · 1 answers · asked by Crystal_Rocks_Dowley 2 in Zoology

The probability density function of the length of a hinge for fastening a door is f(x)=1.25 for 74.6 < x < 75.4 for millimeters. Determine the following:
a) P(X<75.4)=?
b)P(X<74.8 or X > 75.2)
c)If the specifications for this process are from 74.7 to 75.3 millimeters, what proportion of hinges meets specifications?

2007-11-20 15:58:28 · 2 answers · asked by Anonymous in Mathematics

An inspector working for a manufacturing company has a 99% chance of correctly identifying defective items and a 0.5% chance of incorrectly classifying a good item as defective. The company has evidence that its line produces 1.2% of nonconforming items.

a) What is the probability that an item selected for inspection is classified as defective?

b) If an item selected at random is classified as nondefective, what is the probability that it is indeed good?

2007-11-20 15:55:16 · 2 answers · asked by Anonymous in Mathematics

An office water dispenser holds 18.9 L of water. The paper cones from which people drink are 9.5 cm high with radius 3.5

a) how many full cones of water can be dispensed from the container?

b) what is the minimum amount of paper needed to construct the number of cones in part a?

2007-11-20 15:55:01 · 1 answers · asked by andrew c 1 in Mathematics

A worker transports bricks from a pile to the endgate of a pick-up truck, and then pushes the bricks to the front of the truck’s bed.

Is work being done in each of the steps, and if so, please explain (I know work is being done, but I don't know how to explain it other than saying the worker did work)

2007-11-20 15:54:59 · 3 answers · asked by Scout F 2 in Physics

What color are actual "neon" lights?

2007-11-20 15:54:00 · 2 answers · asked by Kevin 1 in Chemistry

2007-11-20 15:52:31 · 11 answers · asked by Juice 1 in Astronomy & Space

How do you write the chemical equation for the combustion of ibuprofen (C13H18O2). Is this reaction balanced? Justify your answer.


Why is NO2 a balanced equation?
Is this reaction endothermic?

How do you write a chemical equation for the reaction in which sodium and water make hydrogen gas and sodium hydroxide (NaOH). Is this reaction balanced?


How can you write out a chemical equation for the reaction in which nitrogen triiodide makes nitrogen gas and solid iodine (I2). Is this reaction balanced?

Write a chemical equation for the combustion of ethyl alcohol (C2H6O). Is this reaction balanced?


Write a chemical equation for the combustion of ibuprofen (C13H18O2). Is this reaction balanced?

2007-11-20 15:52:05 · 2 answers · asked by Jaz 'ma' Taz 2 in Chemistry

was that really true?

2007-11-20 15:50:50 · 15 answers · asked by ghoulart 1 in Astronomy & Space

i Think it Has To Do With Electrons?

2007-11-20 15:48:59 · 1 answers · asked by #20babiigurl 1 in Chemistry

PbSO4

Answer Format:


For KMnO4 the correct answer would be +1 +7 -2 for the elements K Mn and O respectivley.


That is, you must type in the oxidation numbers for each element in the compound
(reading from left to right)

Put one and only one space between each oxidation number, and include the sigh + or -,
as in the example answer format above

2007-11-20 15:46:10 · 2 answers · asked by Poland Spring 1 in Chemistry

The rate of change of the area affected by a culture is determined by the form dA/dt = k (A^1/2) (M - A) where the rate is proportional to the number of cells on the periphery (A^1/2) and the unaffected area (M - A). k is the proportionality constant.

How do you prove that the tissue culture is growing fastest when M/3? 2nd derivative = 0? But it doesn't turn up.

Find A(t) in terms of the initial area Ao = A(0)?

After what time does the tissue reach M/2?

2007-11-20 15:42:06 · 1 answers · asked by maximgubaya 1 in Mathematics

how do you find x when Lnx + Ln(x+3)=1 im confuesd i only got up to Lnx(x+3)= 1 thanksss

2007-11-20 15:39:20 · 3 answers · asked by meow 2 in Mathematics

Does it melt, char or burn?
The same question goes for porcelain and bone.

2007-11-20 15:36:39 · 6 answers · asked by Tunips 4 in Other - Science

What is the difference between reflector, refractor, zoom? and what is altazimuth mount? does red-dot projection viewfinder help? what does a diagonal viewer do? will he actually be able to see the rings of Saturn, moons of Jupiter, the moon's craters?

2007-11-20 15:32:46 · 6 answers · asked by Anonymous in Astronomy & Space

2007-11-20 15:28:51 · 4 answers · asked by claudia 2 in Mathematics