Science & Mathematics - 28 January 2007

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I always choose best answers. :D

2007-01-28 14:23:02 · 2 answers · asked by Sarina 2 in Mathematics

In a group of 180 persons composed men, women, and children, there are twice as many men as women, and three times as many women as children. How many are there each?

In 8 years, a will be 3 years older than twice her present age. How old is she now?

If a certain number is added to 36, the result is the same as if the number were multiplied by 4. What is the number?

2007-01-28 14:22:08 · 4 answers · asked by tennisdude2793 2 in Mathematics

2007-01-28 14:21:49 · 5 answers · asked by Anonymous in Engineering

http://i63.photobucket.com/albums/h133/sexiazztomboi/algebraII.jpg On this page I need help with the Questions 14 and 16
http://i63.photobucket.com/albums/h133/sexiazztomboi/algebra.jpg 26 and 28 I need help with the Questions

2007-01-28 14:17:51 · 2 answers · asked by hotttlikeeefirrrrrre 1 in Mathematics

Fluorine and Chlorine are gases, Bromine is a liquid, and Iodine is a solid.
Which of the following statements are true about these elements?

1. All of the molecutes are diatomic.
2. All of the molecules are non-polar.
3. The intermolcular forces increase as you move down the family because of larger electron clouds producing induced dipoles.
4. The intermolecular forces increase as your move down the family because of increased shielding.

(Note)Can be any combination of the choices above.

2007-01-28 14:16:28 · 3 answers · asked by BlaireOboe 1 in Chemistry

a. marine
b. reproduce by asexual reproduction only
c. relatively simple but sophisticated nervous system
d. nematocysts
e. multicellular

2007-01-28 14:15:54 · 3 answers · asked by Anonymous in Biology

For the following assume the relationship can be expressed as a Linear Equation in two variables. Use the given information to determine the equation and express the equation in Standard Form.

A company produces Fiberglass Shower Stalls, it can produce 10 stalls for $2015, and 15 stalls for $3015. Let 'y' be the cost and 'x' the number of stalls.

2007-01-28 14:15:54 · 4 answers · asked by Anonymous in Mathematics

2007-01-28 14:15:06 · 6 answers · asked by Amy 1 in Botany

like blackholes
or the fact that some bees are cures?

2007-01-28 14:13:07 · 7 answers · asked by storage b 1 in Astronomy & Space

It occurs to me that a combined history and geography course on national and state boundaries would be interesting. Some topics might include: Why does Michigan have an Upper Peninsula? How did the "Florida Counties" east of the Mississippi become part of Louisiana? Why is Vermont a state, not combined with New Hampshire, and why was Vermont the 14th state but not the 14th colony? What happened to the Plimoth Colony? What is the Adams-Onis Line? Why is Idaho a state, and why does it have that odd shape? Why is the New York-Connecticut border bent along the Westchester-Fairfield line? Why is there a zigzag at the Cumberland River along the Kentucky-Tennessee border?

I think this stuff is interesting. Any thoughts?

2007-01-28 14:12:55 · 1 answers · asked by bpiguy 7 in Geography

Does anyone know this question:
Which of the following reactions represents the Haber process to synthesize ammonia

A.N2(g)+3H2(G) <-->2nh3(g)
B. NaCl(aq) + H2O (l) --> NaOH(aq)
C. 2NO(g) + O2(g) -->2NO2(g)
D. 2S(s) +3O2(g)-->2SO3 (g)

thanks, and if you can tell me how you know it/how you do it that would be helpful!!

2007-01-28 14:12:35 · 6 answers · asked by nice too meet you. 4 in Chemistry

2007-01-28 14:11:53 · 2 answers · asked by Queen Kitty 3 in Astronomy & Space

2007-01-28 14:11:44 · 2 answers · asked by Amy 1 in Biology

2007-01-28 14:11:33 · 2 answers · asked by Amanda M 1 in Geography

2007-01-28 14:11:25 · 6 answers · asked by king218@sbcglobal.net 1 in Mathematics

2007-01-28 14:09:25 · 10 answers · asked by Anonymous in Astronomy & Space

Question: A positive charge +q1 is located to the left of a negative charge -q2. On a line passing through the two charges, there are two places where the total potential is zero. The first place is between the charges and is 4.00 cm to the left of the negative charge. The second place is 7.00 cm to the right of the negative charge. (a) What is the distance between the charges? (b) Find q1/q2, the ratio of the magnitudes of the charges.

My Thoughts:
Ok...This might be one of the most confusing questions I've ever encountered in Physics! I drew a diagram, but i had no clue what i was doing. I know the equation V = Kq/r is supposed to be used, but i don't know what to substitute in the problem!!! please show me how you do this problem. appreciate all the help i can get!

Book Answer: I only have part b, which is 3.67

(Note: I will award a best answer - i promise)

2007-01-28 14:07:21 · 1 answers · asked by Anonymous in Physics

1.)__ Balanced equation for the combustion of B 2H 6
2.)__Neutralization of stomach acid (HCl) by milk of magnesia (magnesium hydroxide)
3.)__Balanced equation for the combustion of Si 4H 10
4.)__Thermal decomposition of nitrous oxide (laughing gas)
5.)__A salt like(alkaline earth metal) hydride reacting with water.
6.)__Thermal decomposition of witherite (barium carbonate)
7.)__Reduction of a metal halide by drogen to form a metal

a. CaH 2 + 2 H 2O --> Ca(OH) 2 + 2 H 2
b. PdCl 2 + H 2 --> Pd + 2 HCl
c. BaCO 3 --> BaO + CO 2
d. 2 HCl + Mg(OH) 2 --> MgCl 2 + 2 H 2O
e. B 2H 6 + 3 O 2 --> B 2O 3 + 3 H 2O
f. 2 Si 4H 10 + 13 O 2 --> 8 SiO 2 + 10 H 2O
g. NH 4NO 3 ---> N 2O + 2 H 2O

2007-01-28 14:07:17 · 6 answers · asked by Cupcake 2 in Chemistry

I have seen some evolution critics state that evidence for evolution is merely adaptation. Obviously species will adapt, but at what point does adaptation become evolutionary?

2007-01-28 14:06:13 · 6 answers · asked by David W 3 in Biology

Does anyone know the difference between Syngamy and Fertilization? I'm doing a study guide for my BIO 109 class and I can't figure it out.

Is it syngamy is the product of an egg and sperm
and Fertilization is the product of two gametes?

2007-01-28 14:06:04 · 1 answers · asked by Anonymous in Botany

copper mines

2007-01-28 14:05:59 · 4 answers · asked by ~C.b.~ 1 in Earth Sciences & Geology

Animals that eat woody plants lack an enzyme that is important in what process?
A. Dehydration synthesis of glucose monomers
B. Hydrolysis of cellulose
C. Digestion of Cellulose
D. answers A, B, and C
E. Answers B and C

i was leaning for C, because lignin (which is in wood) is hydrophobic, so i dont think an animal would eat wood for hydrolysis of cellulose... which would cut out answer D.
but im terrible at biology and my professor doesnt explain anything.

2007-01-28 14:05:58 · 2 answers · asked by UNCBballGirl 2 in Biology

Can you please tell me what an underwater is! I need it for school and it's due tomarrow!

2007-01-28 14:05:09 · 2 answers · asked by Louise B 1 in Earth Sciences & Geology

plz answer

2007-01-28 14:04:04 · 17 answers · asked by ☆Stranger in a Sunset☆ 3 in Weather

is the answer multiplication?

2007-01-28 14:03:06 · 4 answers · asked by Anonymous in Mathematics

1, The smallest angle of a trianlge is 70 degree. Find the other two angles if we know that they differ
by 6 degree:
2. The sum of the inner angles of a polygon is 5580 degree. How many sides does the polygon have?

2007-01-28 14:01:51 · 8 answers · asked by do you smell..... what's coo 4 in Mathematics

2007-01-28 14:01:06 · 2 answers · asked by pokeralchemist 2 in Mathematics

2007-01-28 14:01:03 · 4 answers · asked by Anonymous in Geography

2007-01-28 14:00:35 · 6 answers · asked by ProdigyNyR 2 in Weather

2007-01-28 13:58:57 · 5 answers · asked by Anonymous in Biology