Science & Mathematics - 26 August 2007

2007-08-26 04:32:16 · 2 answers · asked by 'Ya 1 in Engineering

how do you figure out this problem? (are there formulas?)

An item costs $100 including 6% sales tax. What is the cost of the item before sales tax? What is the amount of sales tax?

I'm stuck!!!! Thank you!

2007-08-26 04:26:39 · 11 answers · asked by marie 2 in Mathematics

please tell me if the planet mars is encountering with planet earth this august 27 2007? i got an email and i spread it to everyone but now i am confused it wont happen bc i think it happened last year or something. is it happening on aug 27 2007???

2007-08-26 04:26:22 · 7 answers · asked by Anonymous in Astronomy & Space

2007-08-26 04:24:24 · 12 answers · asked by Anonymous in Chemistry

3 f(x)... but why? I know that's right because no matter what I substitute for x in my calculator it comes out, but I have no idea how to prove my work.

2007-08-26 04:23:50 · 5 answers · asked by the1nonlypy 2 in Mathematics

How do scientists figure out how far a light came from. As they say we are still getting light from billion of years away from big bang time. Is that light like the light from the stars we see at night?

2007-08-26 04:23:40 · 5 answers · asked by elearner 1 in Physics

(√5)/[5(√6)-(√5)]. the answer I keep coming up with is [5(√30)+1]/(29). I am not sure if this is correct.. help please

2007-08-26 04:23:02 · 1 answers · asked by m-o-o-n 3 in Mathematics

Would you please explain the answer of this problem to me.

(5x/ 3x +1) - (1/9x + 3) = (7/6)

Thanks

2007-08-26 04:22:01 · 14 answers · asked by Gator Girl 5 in Mathematics

Solve for y.
3x^2/y=2y+b . Thank you.

2007-08-26 04:21:06 · 4 answers · asked by Anonymous in Mathematics

2007-08-26 04:20:36 · 11 answers · asked by lifeboat51 1 in Weather

2007-08-26 04:20:36 · 4 answers · asked by Anonymous in Mathematics

2007-08-26 04:19:06 · 5 answers · asked by enchel 1 in Chemistry

2007-08-26 04:18:50 · 3 answers · asked by Anonymous in Chemistry

Is it 100% "foolproof" to use an elevator? I've always assumed that if for some reason the elevator I was in started plunging to the ground, some sort of safety brakes would kick in and save me. Is this or is this not the case? Are there safety brakes? If there are, how many floors would it take before they actually pulled up the elevator?

2007-08-26 04:14:05 · 3 answers · asked by michael 2 in Engineering

2007-08-26 04:12:39 · 4 answers · asked by Anonymous in Zoology

If f(x) = ax^2 + bx + c, where a, b, and c are real numbers, and f(x) > 0 for all x, then does 'a' have to be positive? Who can prove this? I have tried some arguments using concepts from calculus but have not, to my mind, been successful. It's driving me crazy, so I'd love it if one of you can produce a clear, cogent proof that 'a' has to be positive if f is everywhere positive.

2007-08-26 04:10:23 · 6 answers · asked by AxiomOfChoice 2 in Mathematics

just wondering

2007-08-26 04:08:01 · 5 answers · asked by Christie W 4 in Astronomy & Space

The square root of a number x is always less than x.

2007-08-26 04:06:31 · 5 answers · asked by Anonymous in Mathematics

really considered cloudy either...I use to think clear or hazy but found out I was wrong

2007-08-26 04:00:48 · 3 answers · asked by Summer C 1 in Weather

2007-08-26 04:00:38 · 10 answers · asked by sheslioness 1 in Engineering

I know it's easy, but help me anyway, while your at it figure out this one too.
The difference of two numbers is 6. The second is 9 less than 2 times the first. What are the two numbers?

2007-08-26 04:00:12 · 10 answers · asked by cathy m 2 in Mathematics

If I solve for y in the equation 7y+6x = 10, is it that y = 10/7?

If I solve for y in the equation (1/4)y-7x = (15/2), is it that y = 30?

If these are the wrong answers, you any answer kindly show me how to get the right answers?

Thank you.

2007-08-26 03:59:25 · 5 answers · asked by hp 1 in Mathematics

Can this trees can make frie energy? I think putting a wire that are connected to the branch or near the leavs?Will it make energy?

2007-08-26 03:57:08 · 1 answers · asked by Anonymous in Botany

Would it be possible to put a satellite into an elliptical orbit around Mars?

The orbit I am thinking of would ideally be closer to Mars's North and south poles than the other parts of Mars.

2007-08-26 03:52:26 · 8 answers · asked by Anonymous in Astronomy & Space

and the possibility of multible Universes, do you think that any Aliens that visit the earth may actualy be from one or more of these other Dimensional Universes or do you think they are traveling great distances accross the vastness of space to get here? Maybe the "Greys" are just the cross dimensional inhabitants of the Earth!
(This is of course, assuming that we are actualy being visited)

2007-08-26 03:50:15 · 6 answers · asked by bender_xr217 7 in Astronomy & Space

im doing this school project as how my teacher asked me too,your cooperation in helping me is very much appreciated!

cheers~

2007-08-26 03:46:57 · 1 answers · asked by obieealex 1 in Chemistry

2007-08-26 03:42:50 · 2 answers · asked by Rishabh 1 in Mathematics

on a day that has a little clouds than on a clear day

2007-08-26 03:41:12 · 3 answers · asked by Summer C 1 in Weather

I need help with this homework question
Ive never been good at math and I am absolutley
bazzled at this question I dont' get it at all
can some1 please tell me how I might figure it out
or what the answer is
here is the question exactly as written:

Mrs. Jones had some white paint and some green paint, and a bunch of wooden cubes. Her class decided to paint the cubes by making each face either solid white or green.
Jaun painted his cube with all 6 faces white--Julie painted her cube solid green. Hector painted four faces white and 2 faces green. How many cubes could be painted in the fashion, so that each cube is different from the others? Two cubes are alike if one can be turned so that it exactly matches, color for color on each side, the other cube.

Pleeeeez help i will except all answers just try pleeeez.

2007-08-26 03:36:38 · 5 answers · asked by Pinkadots243 1 in Mathematics

Calculate the current in a 140-W electric blanket connected to a 120-V outlet.

2007-08-26 03:31:24 · 5 answers · asked by boy101 3 in Physics