Science & Mathematics - 13 September 2007

i don't kno how to do percentage problems!!

2007-09-13 16:47:35 · 7 answers · asked by Amy F 1 in Mathematics

2007-09-13 16:47:31 · 7 answers · asked by jasondede123456789 1 in Earth Sciences & Geology

In the Film Conspiracy, Mel Gibbson's character Jerry Fletcher outfittied his appartment to self-destruct? WHen his apartment is raided he set it ablaze. But the rest of the building was left unharmed do to fire-containment systems he set up. Is it possible to rig an apartment or office in such a manner?

Can an apartment or office be designed to self-destruct like this (destroy the office/apartment without damage to rest of the rest of the building)?

2007-09-13 16:45:44 · 7 answers · asked by Yahoo Sucks 5 in Engineering

In my opinon I dont think we went just because we havent gone back so just let me know your opinons without swearing please

2007-09-13 16:41:54 · 20 answers · asked by Rachael 3 in Astronomy & Space

expectations?
this is an english question from the scralet letter story please give me the answer.

2007-09-13 16:35:09 · 2 answers · asked by oooooooooooo 1 in Chemistry

[ ( 3 / (x-2)) - ( 1 / (x-3)) ] / [ ( 1 / (2-x)) + (2 / (x+3)) ]

I hope it makes sense with the brackets..it looks a little messy. Please help. thanks :)

2007-09-13 16:33:43 · 5 answers · asked by Anonymous in Mathematics

at a speed of 65 km/h?

2007-09-13 16:31:16 · 5 answers · asked by abbs 2 in Physics

Chemical Sedimentary rocks, non-foliated metamorphic rocks, plutonic igneous rocks, or all of the above.

2007-09-13 16:29:10 · 1 answers · asked by sportman16977 2 in Earth Sciences & Geology

2007-09-13 16:26:53 · 5 answers · asked by sportman16977 2 in Earth Sciences & Geology

find dy/dx if y=x-(1/2)(x^2+4) tan^-1 (x/2)
omg, this is so hard. this 1 question worth 50 points of the homework. help!!!

2007-09-13 16:26:28 · 6 answers · asked by NOMEGA 1 in Mathematics

A lizard lies in the sun to regulate its body temperature. Which form of heat transfer allows the sun to warm the lizard?

a)Conduction
b)Convection
c)Radiation
d)No heat transfer will take place

2007-09-13 16:22:49 · 5 answers · asked by jay 2 in Earth Sciences & Geology

I just started a proofs course in college and have been doing great so far with direct proofs (if x and y are both even, then x + y is even - simple stuff like that) ...until this last section hit us...I can't seem to do any of the proofs. We just learned what proof by contrapositive was. Here is one I have no idea about...

If ab > 0 and bc < 0, then ax^2 + bx + c =0 has two distinct real roots.

A couple issues arise...first, what is a distinct real root? She never mentioned it. I know real roots, but distinct...does that mean unique? or what?

Next, I cannot say whether or not a,b, or c is negative. All I know is one or more will have to be to fit both hypothesis.

If I should use proof by contrapositive, well..it simply leaves me stuck at the hypothesis ax^2 + bx + c = 0 does not have two distinct real roots. I still have no idea what to do with that knowledge or how to write it out to even get started with something...

2007-09-13 16:21:12 · 2 answers · asked by Anonymous in Mathematics

2007-09-13 16:19:14 · 4 answers · asked by pink_kitties_and_rhinoplasty 2 in Mathematics

Thanks so much in advance!!!
1) Find the domain of the function.

F(X) √ 2x-14

2) Find the domain of the given function.

F(X) = x-10 / x^3+9x

2007-09-13 16:16:09 · 3 answers · asked by lifeiscake 3 in Mathematics

I have a test tomorrow, and I need serious help and quick! If a graph has a u shaped curve and it's pointing down, what is it? a relation? function? What if it's curved up?

2007-09-13 16:13:28 · 6 answers · asked by Sassafras 1 in Mathematics

its been forever since i have done math
i also need to know step by step to the solution
thanks

2007-09-13 16:13:08 · 9 answers · asked by Anonymous in Mathematics

1. The density of an object is 1000 mg/µm3. Calculate its density in SI.

2. A train is speeding with an acceleration of 0.18 km/h2. Calculate its acceleration in SI units.

3. A cubic container measuring 2 in x 2 in x 2in is filled with water.

a. What is the volume of this container in (in3)?
b. What is the volume of this container in (m3)?
c. What is the volume of this container in liters?
d. What is the mass of the water in kilograms?

I have worked on 22 of these problems, but I am stuck on these last 3 . Thank you in advance for any help you can provide with any of the questions. If you could provide a link to a website or a brief explanation (show work), I would greatly appreciate it. Thanks, again!

2007-09-13 16:13:07 · 2 answers · asked by Heather 3 in Physics

if i lived right on the equator,right smack dab on it would i have to do the daylight savings time change?!

2007-09-13 16:11:39 · 2 answers · asked by Emmett W 1 in Earth Sciences & Geology

basically, when your on the moon, your lighter, and on earth your heavy. what other place makes you heavier than being on earth? this is a science question from class, but i don't know the answer.

2007-09-13 16:09:46 · 3 answers · asked by janineisstylin 1 in Earth Sciences & Geology

I just switched majors from undeclared to Math around a semester ago, so I'm still in Trigonometry, preparing to take Calculus. So far, I am loving all of the concepts and things I get to do. I took a College Algebra class and fell in love so much that I became a tutor WHILE taking the class.

I have an education class with someone in Calculus and they are too a math major, and she seems to "show off". In my mind she's an idiot because of her extracurricular philosophies.

While I was doing homework earlier after I got off at work (still at work) a girl came up to me and started to lecture me how what I was doing was wrong (I was solving right triangles using the trig) and once I was finished I checked my answer in the BOB and it cleared.

Does anyone else have this kind of problem with math? Or should I tell these people to shove it and let me enjoy math?

2007-09-13 16:07:59 · 6 answers · asked by MrPodpechan 1 in Mathematics

Does Hydrogen burn alone?
Does oxygen burn alone?
And did anyone believe Democritus at the time of his Atomos theory.

2007-09-13 16:06:03 · 7 answers · asked by Anonymous in Chemistry

is the bermuda triangle real??i wanna believe cause it would be so cool to encounter it but ppl say its just a legend but more ppl say that its true and theres many aircrafts and ships that disappeared and with no trace left but they appear several years later in another part of the world?!?!? but what realy cause it and how can magnetic watever you call it can cause it. My opinion is that the bermuda is caused by a clash of time in space because mayb the world has enough history???pls tell me what you think of this. this is the question that makes me think the most.!!!!

2007-09-13 16:03:42 · 6 answers · asked by llovell 6 in Earth Sciences & Geology

is the bermuda triangle real??i wanna believe cause it would be so cool to encounter it but ppl say its just a legend but more ppl say that its true and theres many aircrafts and ships that disappeared and with no trace left but they appear several years later in another part of the world?!?!? but what realy cause it and how can magnetic watever you call it can cause it. My opinion is that the bermuda is caused by a clash of time in space because mayb the world has enough history???pls tell me what you think of this. this is the question that makes me think the most.!!!!

2007-09-13 16:02:44 · 13 answers · asked by llovell 6 in Astronomy & Space

I want to perform a simple blood test on a group of women to gauge their fertility (relative to one another).

I was thinking estradiol, but then women taking birth control would mess up the study because most birth controls have synthetic estrogens.

So what is an easy way for me to compare fertility between different women?

2007-09-13 16:01:52 · 2 answers · asked by Ayla 3 in Medicine

thanks ahead of time

2007-09-13 16:01:06 · 2 answers · asked by bob 1 in Biology

It doesnt make any sense to me

2007-09-13 15:58:49 · 21 answers · asked by WeNeedEachOther 1 in Astronomy & Space

2007-09-13 15:57:30 · 4 answers · asked by cassie9240 1 in Earth Sciences & Geology

2007-09-13 15:54:19 · 2 answers · asked by mud v 3 in Biology

I have looked in two math help books and I still can't figure out this equation!

Terry has 3 more quarters than dimes for a total of $3.55. How many quarters does he have?

I know that the answer is 11 quarters (thanks to the back of the book) but try as I might, I can't figure out how to setup the problem. Could someone please help? And if you don't mind, please explain how you decided to set it up so I can learn from it. (Example- "I put 25-x because....and I set it equal to " " for this reason...and so on.) Thank you so much to whomever helps me, because it will cease my increasing frustration.

2007-09-13 15:52:48 · 5 answers · asked by ashley2325 2 in Mathematics

either the y-intercept and one point or the x-intercept and one point?

2007-09-13 15:51:43 · 8 answers · asked by tyra s 2 in Mathematics