Science & Mathematics - 31 October 2007

2007-10-31 23:57:14 · 4 answers · asked by Anonymous in Mathematics

find the limit when x approaches to infinity ?
(ln (2 + e^(3x))) / (in ( 1 + e ^x))

2007-10-31 23:50:28 · 2 answers · asked by dr-Fouad 2 in Mathematics

2007-10-31 23:49:23 · 7 answers · asked by hellllloooooooo 1 in Mathematics

2007-10-31 23:46:47 · 2 answers · asked by cinnamonstar123 2 in Geography

2007-10-31 23:44:35 · 30 answers · asked by Anonymous in Mathematics

2 / (3x+1) = 1 / x - 6x / (3x+1)

2007-10-31 23:40:03 · 4 answers · asked by gr8ventura 1 in Mathematics

An article todays states that we throw away one third of our grocery shopping and that is impacting on Co2 levels. Does anyone know what the methane output of one third of our food eaten is? Wouldn't it have the same impact or more?

2007-10-31 23:31:52 · 2 answers · asked by Lozzie p 2 in Chemistry

2007-10-31 23:14:18 · 4 answers · asked by hellllloooooooo 1 in Mathematics

what could we hope to gain by sending a probe to mars

2007-10-31 23:02:45 · 2 answers · asked by Ryan 2 in Astronomy & Space

2007-10-31 22:57:34 · 9 answers · asked by hellllloooooooo 1 in Mathematics

2007-10-31 22:55:58 · 12 answers · asked by Anyan J 1 in Weather

A tower 27.5 meters tall makes an angle of 126 degrees with the inclined road on which it is located. Determine the angle subtended by the tower at a point down the road 35 meters from its foot.

2007-10-31 22:48:54 · 2 answers · asked by delixir_21 1 in Mathematics

FOR AN ASSINGNMENT PLEASE HURRY ON ANSWERS AS MANY AS I CAN GET

2007-10-31 22:42:27 · 2 answers · asked by Anonymous in Engineering

my 6 yrs old nephew asked me this question...does anyone there knows the answer???

2007-10-31 22:14:12 · 7 answers · asked by Gabriel 1 in Zoology

Please can you give the answer to this sum then explain how you got the answer so I can learn myself, thank you.

7.1 x 10-3 (the minus sign should be higher up but the computer did not have a button for this!)

2007-10-31 21:51:13 · 7 answers · asked by Michele 3 in Mathematics

First to answer correctly and in details gets best answer

2007-10-31 21:49:51 · 2 answers · asked by Drag DarkFire 2 in Mathematics

2007-10-31 21:49:08 · 1 answers · asked by murali k 1 in Mathematics

It reacts with the alkali metals (M) to form a salt MX, where X is the halogen.
Its hydrogen halide, HX, forms an acidic solution.
It is prepared by electrolysis from a molten salt.
It forms interhalogen compounds only of the form XA, where A is the unknown and X is another halogen.

1. fluorine 2. chlorine 3. bromine 4. iodine

2007-10-31 21:36:05 · 2 answers · asked by dbdwnd 1 in Chemistry

2007-10-31 21:32:16 · 8 answers · asked by Anonymous in Agriculture

I did a redox experiment where I got H2 to be released from water by sending electricity into a metal in water. The metal lost .024 grams and 50 mL of H2(g) was collected.
I established the half reaction was 2e-+H2O->H2, and the problem said, (1 mole e- = 1 faraday)
The following problem says, "With knowledge of EM, the molar mass of your metal (MM) may be calculated using the equation MM = EM x n. Here, n is the charge of oxidaized metal cation, so MM simply represents a multiple of EM. For instac,e for EM=24, MM has possible values of 24 g mol^-1 (for n=+1), 48 gmol^-1 (for n=+2)...etc.

The problem is "The equivilant mass (EM) of a metal is the mass of metal oxidized by 1 f (faraday).In this experiment EM is calculated using the following equations
EM=metal lost(g)/f
This expression assumes that 1f is required to oxidize 1 EM of metal. Using your data, calculate the EM for your metal."

In order for that to happen, EM has to be above 1 but metal lost is .024, so how do I get EM>1?

2007-10-31 21:26:46 · 1 answers · asked by Anonymous in Chemistry

x - y + 2z = 4
2x - 2y + 4z = 7
3x - 3y + 6z = 11

placing them in a matrix
1 -1 2 4
2 -2 4 7
3 -3 6 11

then proceeding with row-echelon form I got

1 -1 2 4
0 0 0 -1
0 0 0 -1

By analyzing the equations for the planes, I know that all the planes are parallel but are in different places.

What I'm having a problem with is that when I plug my equations into a program, I get:
1 -1 2 4
0 0 0 -1
0 0 0 0

What did I do wrong?

2007-10-31 21:23:45 · 2 answers · asked by fye 1 in Mathematics

a) a mercury vapor streetlight
b) an incandescent (tungsten filament) streetlight
c) a star like the sun

how do you know which spectrum it is?

2007-10-31 21:13:14 · 2 answers · asked by Anonymous in Physics

What is the most powerfull drug that can be used to treat terminal pain without puting the person into a coma? I know there are surgical procedures but im just interested in medication.

Could doctors and nurses answer this one please.

2007-10-31 21:12:43 · 8 answers · asked by taken 1 in Medicine

2007-10-31 21:05:10 · 0 answers · asked by Kainon 1 in Chemistry

date of birth 12-04-1961, birth time 8.15 am

2007-10-31 21:00:55 · 6 answers · asked by George M 1 in Astronomy & Space

would you ever play it again??

2007-10-31 20:54:57 · 8 answers · asked by Shuggah Pie Sweets 3 in Paranormal Phenomena

what are the chances of something crashing into the sun and having an impact on earth

or something big enough to wipe out the sun, what would happen and how long would it take before we felt the effect

2007-10-31 20:46:27 · 4 answers · asked by BOB 1 in Astronomy & Space

2007-10-31 20:44:45 · 4 answers · asked by Anonymous in Geography

I understand simple factorials, but not factorial quotients where you have a numerator and denominator that don't simplify. I don't know what to do with expressions like 1 * 3 * 5 * 7 ..... (2n - 1).

There are two alternating series I'm stuck on. I am supposed to determine the convergence or divergence of the series using the Alternating Series Test: find where an is > 0; the limit of an as n approaches infinity must = 0; and you must show that a(n + 1) [the next nth term after an] is less than an for all values of n. We've been using derivatives to show a function is decreasing so I don't understand these mathematical induction style proofs.

1) Summation, from 1 to infinity:
[(-1)^(n + 1) * n!]/[1 * 3 * 5 . . . (2n - 1)]

2) Summation, from 1 to infinity :
[(-1)^(n + 1) * 1 * 3 * 5 . . . (2n - 1)]/[1 * 4 * 7 * . . . (3n - 2)]

If any math genius happens to see this, I would really be happy to have some help. Thanks. :)

2007-10-31 20:44:41 · 3 answers · asked by Anonymous in Mathematics

5m2=16-3?
(2 means squared)

2007-10-31 20:29:19 · 6 answers · asked by Anonymous in Mathematics