Science & Mathematics - 24 September 2007

my brother keeps telling me that the u.s has a is 200 Megaton bomb? i dont believe him

2007-09-24 20:50:24 · 3 answers · asked by c d.o.t 3 in Chemistry

1. The price of a 2-hour plumbing repair job is $130 and the price of a 5-hour job is $250. Find the slope of the line. Match your result to the correct answer below.
A) $50/hr B) $180/hr C) $40/hr D) $120/hr

2.The price of a 2-hour plumbing repair job is $130 and the price of a 5-hour job is $250. Write an equation for the cost of a t-hour repair job and use the equation to find the cost of a repair job lasting 6 hours.
A) C = 50t + 40; $340
B) C = 40t + 50; $290
C) C = 40t; $240
D) C = 40t + 40; $280

Thank you for any help that you can give.

2007-09-24 20:48:12 · 4 answers · asked by Lady E 1 in Mathematics

2007-09-24 20:45:15 · 12 answers · asked by shablax 2 in Medicine

i tried finding the derivative of x^3 +2x2+2. i try it on the calculator and it gives me the derivative at a certain point. so it gives me a numerical value.

i know that the derivative of x^3 +2x2+2 is. i know that its 3x^2+4x. i just want to find out how to find it in this format instead of a numerical value on the calculator.

thanks.

2007-09-24 20:45:06 · 1 answers · asked by diehard4ever319 1 in Mathematics

2007-09-24 20:40:25 · 4 answers · asked by manasa n 1 in Engineering

2007-09-24 20:37:08 · 1 answers · asked by lixingsddx 1 in Chemistry

whats more powerful

2007-09-24 20:31:55 · 6 answers · asked by c d.o.t 3 in Chemistry

-_-

2007-09-24 20:13:27 · 2 answers · asked by Anonymous in Chemistry

I have this science project that is an imaginary space station. You can think of it as a mini Earth. It is same as Earth, but it is just a space station and is much smaller. (Has less species of animals/plants :) ...)

MY question is what does it mean to describe the path of energy and matter through living systems and the physical environment?? I get the energy, they are passed by eating but what is matter? How can matter be passed????? To illustrate the path of energy/matter how should I draw it out? By using a food web or what?

2007-09-24 20:03:38 · 1 answers · asked by Anonymous in Biology

The pilot of a small boat measures and determines that the angle of elevation of the the top of a lighthouse is 19°. The Lighthouse reaches 21m above sea level. Find the distance between the boat and the lighthouse.

I don't know which function to use because when I draw the right angle the problem doesn't tell you which is x and which is y.

2007-09-24 19:58:29 · 5 answers · asked by SUPERMAN 2 in Mathematics

What is the probability that you would give someone your last dollar?

What is the probability that you would give your last dollar to someone selfish enough to take your very last dollar?

2007-09-24 19:56:28 · 3 answers · asked by Tasm 6 in Mathematics

(a) Which type of organisms remove
1. carbon dioxide frm the atmosphere
one of my answers is : Plants,
But i don't have an idea of the other organisms

2. nitrogen frm the atmosphere
one of my answers is : Rhizobium Bacteria
But what other organisms?

(b) By which processes do microorganisms return

1. carbon dioxide to the atmosphere.
my answers are; respiration, decomposition
is fossilisation correct? i mean when the fuel is burnt, CO2 is returned to atmos

2. nitrogen to the atmosphere.
one of my answers is: denitrification
R there other processes?


(c) What are the main human impacts on
1. carbon cycle
2. nitrogen cycle


Thanks

2007-09-24 19:52:05 · 5 answers · asked by Mystic healer 4 in Biology

This is my blood type and I've been told that it's rare (if you knew me, that would not surprise you in the least, lol, I'm left handed and have that red hair only 2% of the world has). So this is my question. I donate blood to the blood bank when I can. Who can accept AB+? And what blood can I accept?

2007-09-24 19:51:15 · 3 answers · asked by Anonymous in Medicine

ELECTRON CONFIGURATION
Energy Level: 1 2 3
Electrons: 2 8 8

according to the peridoic table and the info above, which element has this electron configuration?

a) Sodium

b) Neon

c) Magnesium

d) Argon

2007-09-24 19:48:01 · 4 answers · asked by XOXO 1 in Chemistry

f(x) = 9x + 9 ;
g(x) = 32x+3 ;
h(x) = 27 (9x) ;
define the same function.

2007-09-24 19:41:53 · 1 answers · asked by Anonymous in Mathematics

Find the volume of the solid obtained by ro-
tating the region A about the line x + 4 = 0 :

2007-09-24 19:40:45 · 1 answers · asked by Anonymous in Mathematics

2C2H2(g) + 5O29g0 → 4CO2(g) + ____

*all but the first "2" is suppose to be lowered.
example: H2O - the "2" is usually lower than the H and the O....make since?

a) 4OH(aq) **4 is NOT lowered

b) CH4(aq) **4 IS lowered

c) H2O2(g) ** both numbers lowered

d) 2H2O(g) **first "2" normal, second "2" lowered

2007-09-24 19:33:22 · 4 answers · asked by XOXO 1 in Chemistry

2007-09-24 19:26:14 · 3 answers · asked by Anonymous in Chemistry

Does the integral from 4 to infinity of (3+sinx)/x diverge?
I need to use a direct comparsion test to figure this out but I dont know what to comapre it to.
any help is much appreciated

2007-09-24 19:25:35 · 3 answers · asked by starz8 2 in Mathematics

they...
a) have differences in reactivity

b) are able to bond with oxygen

c) vary in solubility

d) exist in different places

2007-09-24 19:25:00 · 2 answers · asked by XOXO 1 in Chemistry

is carbon dioxide a triatomic molecule or a compound?
is ozone a triatomic or polyatomic molecule?i thought ozone had 3 oxygen atoms in it...

2007-09-24 19:20:39 · 3 answers · asked by Anonymous in Chemistry

its a baby bottle warmer in which you activate the bag by boiling, but after a feel hours or weeks later when the bag is even at room temp.when you need instant heat just click this little metal button inside and the clear gel or water inside starts turning like snow, but it's hot instanly like magic?
please explain

2007-09-24 19:18:02 · 1 answers · asked by marcos t 1 in Chemistry

With all the problems we are experiencing with our environment, the above question makes sense. What's your opinion?

2007-09-24 19:17:23 · 5 answers · asked by ZORRO 3 in Astronomy & Space

lim x --> -2 f(x)/x^2=1
find :
a. lim x--> -2 f(x)/x = ...??
b. lim x--> -2 f(x) = ...??

Can somebody help me to solve this question
I cant solve this question..
thx in advanced..

2007-09-24 19:15:54 · 1 answers · asked by xXx 1 in Mathematics

i need it right away because this h/w is due tomorrow the equasion is


1.what is the volume of a box that is 2 cm. wide, 3 cm. thick, and ten cm. long

how do you figure out volume by multipling adding subtarcting what is done please help me an give me the answer i'd appreciate it and in return i will CHOOOSE A BEST ANSWER if it helps me out the best one by tonight wilol be chosen by me its already 11:07 pm and i need help by midnight


thanks

signed

----** -me-**----

2007-09-24 19:14:35 · 13 answers · asked by Eminuhh☮ 4 in Mathematics

We know that black holes do not suck up everything in the universe; you have to cross the event horizon before you get sucked in forever. Does this make black holes comparable with vacuum cleaners? After all, vacuum cleaners do have a finite effective radius themselves

2007-09-24 19:12:52 · 4 answers · asked by chabangas 1 in Astronomy & Space

& 56°17' (angle measure) to degree.

Another trig ?:

When you solve right angles how do you know which side is x and y. How do you know which function to use such as tan, sin, cos? THANKS!

2007-09-24 19:12:01 · 7 answers · asked by SUPERMAN 2 in Mathematics

I just thought about this. Stupid question some would say; a brain killer to others.

The graph of x/x should be similar to the graph of 1, but since there's a variable in the denominator, then the domain for x/x is all real numbers except x=0.

Therefore, there is a 'hole' at x=0 on the graph of x/x, whereas the graph of 1 is continuous everywhere. Now, it is said that anything divided by itself is equal to one, but how about the case of x/x?

If you simplify x/x, it would be equal to one, but by leaving it as is, it isn't quite the same.

Anyhow, just a matter I thought would be interesting to point out.

And no, I'm not on crack, thank you.

2007-09-24 19:06:01 · 6 answers · asked by J. Morrissey 2 in Mathematics

3/4(x+2)=27/8 {Given replacement for X....1/2, 1, 1.5, 2, 2.5}
can anyone solve this?

2007-09-24 19:00:00 · 1 answers · asked by Seung7 1 in Mathematics

Calculating the Determination of Water in a Hydrate????HELP!!!?

Here are the weights:

Weight of crucible and cover = 12.85grams
Weight of crucible, cover and sample = 16.21grams
Weight of crucible, cover and sample after first heating = 14.82grams
Weight of crucible, cover and sample after second heating = 14.74grams
Weight of crucible, cover and sample after third heating = 14.72 grams

My chemistry teacher wants me to find the calculations of these samples above. I have no F'in idea if I am right or wrong when I am working out this problem.

I think the formula is Percentage of water=(mass lost divided by mass of sample) and then you multiply it by 100.

Here are the directions for the calculations:

Calculate weight of original sample
Numerical setup:


Calculate weight lost from sample by heating
Numerical setup:


Calculate percentage of water in sample
Numerical setup:


For this one, it also asks:

sample No._____
Percentage of water_____

2007-09-24 18:57:25 · 1 answers · asked by danie 2 in Chemistry