Science & Mathematics - 2 October 2007

2007-10-02 13:42:59 · 2 answers · asked by jessica 1 in Biology

do cells have cells and do they have cells and so on

2007-10-02 13:42:13 · 5 answers · asked by !=]<3Single And Proud Of It&l 2 in Biology

ok so i know it seems easy and i think i got the answer
but i just need to double check it with u guys answers
thanks sooo much!


When each works alone Barbara can do a job in 15 hours less time than John. When they work together it takes them 10 hours to complete the job. How long does it take John working alone to do the job?

2007-10-02 13:42:00 · 6 answers · asked by Anonymous in Mathematics

Match each of the following equations with the letter that tells what the pH of the final solutions that form would be.

a. low (about 1-2)
b. moderately low (about 5-6)
c. high (about 13-14
d. moderately high (about 8-9)

1. ___ NaOH + H2O -->

2. ___ NH3 + H2O -->

3. ___ H2O + CO2 -->

4. ___ HCl + H2O -->


1.B 2.D 3.A 4.C?

2007-10-02 13:41:06 · 3 answers · asked by matterized 1 in Chemistry

The cost of producing one unit of a product is given by
c=a+bx+ky
where x is the amount of labor used (in man hours) and y is the amount of raw material used (by weight) and a and b and k are constants. What does c/x =b mean? What is the practical interpretation of b?

2007-10-02 13:40:09 · 1 answers · asked by doreen 1 in Physics

2007-10-02 13:40:01 · 2 answers · asked by Anonymous in Chemistry

my school is making a homemade hovercraft and i need help with the homemade motor. we tryed useing THe Newton's Law and using a blow up pump but that did not work. plz help before friday.
thanks

2007-10-02 13:39:59 · 1 answers · asked by skittle 1 in Other - Science

2007-10-02 13:38:57 · 3 answers · asked by Anonymous in Astronomy & Space

x over x+2 + x-2 over x

2007-10-02 13:38:45 · 5 answers · asked by arod_69 1 in Mathematics

how does the number of hydrogen atoms compare to the number of oxygen atoms in each amino acid?

whats the difference between an amino acid molecule and a protein molecule?

2007-10-02 13:38:12 · 3 answers · asked by Anonymous in Biology

A satellite in orbit is not truly traveling through a vacuum--it is moving through very thin air. does the resulting air friction cause the satellite to slow down?

2007-10-02 13:37:27 · 4 answers · asked by back2back 2 in Physics

i need help simplifying this:

2/5(10x + 25) = -10 - 4(x +3)

first i distributed and got:
2x + 10 = -10 - 4x - 12
i combined like terms -10 & -12.
2x + 10 = -22 -4x
added 22 to each side then subtracted 2 from each side.
32 = -6x
and then i divided by -6.

the soultion i got is 5 1/3 but the answer is supposed to be -4. what did i do wrong?

2007-10-02 13:36:25 · 2 answers · asked by jkl; 4 in Mathematics

2007-10-02 13:35:59 · 1 answers · asked by Jayson H 1 in Earth Sciences & Geology

2007-10-02 13:35:17 · 8 answers · asked by Anonymous in Astronomy & Space

2/x - 3/2x = 1/3

Solve for x.

Please show how you got the answer. I know it comes to x = 3/2 but I can't figure out how it gets to that answer.

Please explain using the LCD method.

I understand how the other one works but my teacher won't accept the answer if it's not using the LCD method.

HELP PLEASE!

Thank you in Advance!

2007-10-02 13:35:07 · 1 answers · asked by Ruebelle 1 in Mathematics

2007-10-02 13:33:07 · 21 answers · asked by Hello Dave 6 in Astronomy & Space

im 15 & i cant sleep @ night. i lie awake in bed every school night. im so tired @ school. i lie awake as the hours go by. i dont drink caffeine or exercise. what should i do? i have to go to school tomorrow. i dont want to be tired. what if im up until three. i get up at six. you guys have to help me. do something! i have a big day tomorrow. you guys have to do something about this. i missed so much school already due to sleep. were so poor. we cant afford doctors or sleeping pills. so what do you guys recommend?

2007-10-02 13:32:06 · 9 answers · asked by Anonymous in Physics

I'm looking into buying a telescope.
Of course, budget is a concern,
so I'm wondering...

does anyone know what the minimum decent size is?
I see them ranging from 50mm x 450mm
to 1100mm x 102mm

This means nothing to me.

Also, I see there are Dobsonian, Newtonian, and Gallileo ones.
Assuming these are brands?

More important distinctions I think are:
Tri-centric
Refractor
Reflector
Astronomical (I know what that means)
Terrestrial (I know what that means, too and it's not ET!)
and Equatorial

Any ideas what these mean and why I would want them on my telescope?

Kind of in a rush,
as I'd like to purchase it before Thursday.
(Birthday present)

If I know what these things mean,
then I can maybe find one I want in a price range I can afford.
(the one that has them all is $1,399)

2007-10-02 13:31:04 · 5 answers · asked by ncgirl 6 in Astronomy & Space

2007-10-02 13:28:11 · 2 answers · asked by Anonymous in Earth Sciences & Geology

its a chemistry question. how many electrons do you think there are in orbit of the elements rb and cs"; 2nd question same but br and i. i told the teacher the amount of electrons in those elements but she said it was wrong. wth?

2007-10-02 13:28:10 · 2 answers · asked by Updated Life th13f 2 in Chemistry

2007-10-02 13:27:10 · 3 answers · asked by Irene K 1 in Physics

the 4th term is -9
and the 28th term is 9
find the generator, the inital value and an equation
how in the heck do i do this!!!!

2007-10-02 13:27:01 · 2 answers · asked by slhs_classof2010 2 in Mathematics

When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 370 N to hold it there. We pull the block to x = 14.0 cm and then release it. How much work does the spring do on the block when the block moves from xi=+6.0 cm to (a)x= +3.0 cm, (b)x= -3.0 cm, (c)x= -6.0 cm, and (d)x= -9.0 cm?

2007-10-02 13:25:32 · 1 answers · asked by keeptheuroalive 2 in Physics

When testing vapor pressure with water and t-butyl, n- hexane, cyclohexene, and ethyl ether, what changes would you expect if the water and all of the liquids tested had been heated before the experiment?

2007-10-02 13:24:33 · 1 answers · asked by lovin Chem right now 1 in Chemistry

Tickets for the dance cost 20 bucks for a single ticket or 35 bucks for a couple. ticket sales totaled 2280 bucks and 128 people came. how many of each type were sold?

2007-10-02 13:22:20 · 3 answers · asked by Louis C 2 in Mathematics

A mammal uses only 1 to 2 percent of its enegry in ventilation (breathing air in and out) while a fish must spend about 15 percent of its energy to move water over its gills. Explain this huge difference in their efforts to collect oxygen

2007-10-02 13:14:02 · 2 answers · asked by neas182000 1 in Biology

why would an organism with repiratory equipment ever resort to fermentation???

i don't understand how respiratory is related to fermentation :[

need help FAST

2007-10-02 13:13:18 · 3 answers · asked by Anonymous in Biology

not state

2007-10-02 13:09:56 · 6 answers · asked by 435e97y34-9gerg7uy3508340rdgre0& 2 in Geography

what mass of pheno, C6H5OH, (fw=94.11) must be dissolved in 25 g of naphthalene to produce a solution that is 0.22 m in phenol?

2007-10-02 13:08:07 · 1 answers · asked by Anonymous in Chemistry

2007-10-02 13:07:37 · 5 answers · asked by Anonymous in Mathematics