Science & Mathematics - 8 November 2007

like 1/x + 3/y = 3/4
4/x - 2/y = 2.

Please, help me on how would you solve that equation I have no idea how to.

2007-11-08 06:50:17 · 5 answers · asked by John E 1 in Mathematics

2007-11-08 06:44:53 · 1 answers · asked by Sophos 2 in Astronomy & Space

Its a fraction.. is it < or >

6/11 7/10

6/11 < 7/10 or 6/11 > 7/10

2007-11-08 06:44:33 · 6 answers · asked by mistameter8292 1 in Mathematics

a. log(9) 54
b. 54
c.6
d.486

This ? really has me stumped!

2007-11-08 06:43:48 · 7 answers · asked by Hollywood614 2 in Mathematics

A violin string is 36.0 long. It sounds the musical note A (440 Hz) when played without fingering.
How far from the end of the string should you place your finger to play the note C (523 Hz)?

Any help on how to approach this question would be appreciated. Thank you

2007-11-08 06:35:24 · 4 answers · asked by 킹세븐 2 in Physics

2007-11-08 06:29:42 · 5 answers · asked by lordchaos88 1 in Chemistry

Find a whole number so that:

A=13, y=2

When you divide this number by 131 the remainder is Y,
When you divide this number by A the remainder is 7.

2007-11-08 06:28:33 · 7 answers · asked by irish dubliner 2 in Mathematics

exonerate him from being the father of this child?

2007-11-08 06:25:54 · 6 answers · asked by sonal p 1 in Biology

and AB. What are the genotypes of the parents?

2007-11-08 06:24:14 · 3 answers · asked by sonal p 1 in Biology

The below reactions are followed by one or two statements. Choose the correct statements that follow each reaction.

C5H5N + H2O ↔: C5H5NH+ + OH−

a) This is an example of an elimination reaction


Pb2+(aq) + 2I−(aq) → PbI2(s)

b) This is an example of a precipitaion reaction

c) The product is an ionic compound


CH3CH2Br + OH- → CH3CH2OH + Br-

d) This is an example of a substitution reaction

e) Double bonds are formed in the product

2007-11-08 06:22:33 · 1 answers · asked by john1234 1 in Chemistry

What is the derivative of the square root of x?

√(x)

2007-11-08 06:21:36 · 5 answers · asked by Anonymous in Mathematics

2007-11-08 06:21:16 · 3 answers · asked by fatandsmooth 5 in Biology

if I ^ - + Br2 ------> ?????

Please explain..

and would I ^ - + Cl2 -----> ICl2?

2007-11-08 06:21:13 · 1 answers · asked by Cannot Think of Name 2 in Chemistry

1
∫ ln(x) dx
0

2007-11-08 06:19:09 · 2 answers · asked by A4life2k4 1 in Mathematics

5
∫ x^-1/2 + (5-x)^-1/2 dx
0

2007-11-08 06:18:30 · 2 answers · asked by A4life2k4 1 in Mathematics

2
∫ dx/(4+x^2)
- infiniti

2007-11-08 06:17:52 · 1 answers · asked by A4life2k4 1 in Mathematics

A boat leaves a dock at 3:00 P.M. and travels due south at a speed of 20 km/h. Another boat has been heading due east at 15 km/h and reaches the same dock at 4:00 P.M. How many minutes after 3:00 P.M. were the two boats closest together?

kinda lost on this one

2007-11-08 06:16:15 · 2 answers · asked by syem64 2 in Mathematics

2007-11-08 06:16:05 · 5 answers · asked by Anonymous in Zoology

What is the probability that 25 out of 2000 women cannot have children if 10 out of 1000 cannot?

2007-11-08 06:15:19 · 3 answers · asked by star_wisher86 1 in Mathematics

Light of wavelength 598 nm illuminates a single 0.77 mm wide slit. At what distance from the slit should a screen be placed if the first minimum in the diffraction pattern is to be 2.03 mm from the central maximum?

What is the width of the central maximum?

im not sure where to start

2007-11-08 06:14:13 · 1 answers · asked by Pac M 1 in Physics

2007-11-08 06:11:37 · 5 answers · asked by Anonymous in Zoology

A)oxygen and silicon
B)nitrogen and oxygen
C)sulfur and hydrogen
D)silicon and nitrogen

2007-11-08 06:10:48 · 6 answers · asked by Anonymous in Earth Sciences & Geology

Simple equations and reasons are very helpful.
Equipment includes volumetric flask, scales, pipette, beaker etc.

2007-11-08 06:10:18 · 2 answers · asked by Anonymous in Chemistry

Regional parts

Each vertex of a triangle is joined by straight line to six points on the opposite side of the triangle. no three of the joining lines pass through the same point. Into how many regions do these 18 lines divide the interior of the triangle

2007-11-08 06:09:44 · 2 answers · asked by jennifer w 1 in Mathematics

C5H5N + H2O &harr: C5H5NH+ + OH−

a) This is an example of an ionization reaction


Ca2+(aq) + SO42−(aq) → CaSO4(s)

b) This is an example of a neutralization reaction

c) The product is an ionic compound


CH3CH2Br + OH- → CH3CH2OH + Br-

d) This is an example of a substitution reaction

e) Only single bonds are formed in the product

2007-11-08 06:07:44 · 3 answers · asked by Anonymous in Chemistry

I've gotta find out what type of electromagnets and radiation are transmitted by the atmosphere and what are absorbed.
I've tried a lot of internet sites, but I can't find one that breaks it down into something simple enough so that i can understand it fairly easily. I can't spend all night on it, which is why I don't want to go too deep into it, but I'm hoping it's a fairly straightforward answer.

2007-11-08 06:06:51 · 1 answers · asked by Anonymous in Physics

2007-11-08 06:05:12 · 6 answers · asked by Jackson Peter Templeton Jr. 2 in Astronomy & Space

2007-11-08 06:05:12 · 6 answers · asked by Bill W 【ツ】 6 in Biology

please tell me.it is an assignment i was giving to do.the teacher said i should use the internet to find out.Thanks

2007-11-08 06:04:44 · 2 answers · asked by Anonymous in Chemistry

say where you are...also is the temp below or above normal

2007-11-08 06:04:13 · 20 answers · asked by laundromatlyts 2 in Weather