Science & Mathematics - 21 September 2007

multiply:

(5√(6)-15√(7)) ((4√(6)+12√(7))=




use rational expressions to write (x^1/3)( y^1/6)(z^1/9) as a single rational expression.



simplify by factoring.
√(80a^2b)


rewrite the following expression with positive exponents.
(5xy)^-8/9

2007-09-21 21:30:16 · 4 answers · asked by kitty c 1 in Mathematics

Are molecular ions only formed by bombardment of electrons.
what are the similarities between radicals and ions.

2007-09-21 21:26:54 · 2 answers · asked by Maths Rocks 4 in Chemistry

I need a formula that says:

For every 10mph over 55 mph, (miles per hour) your mpg (miles per gallon) decreases by 10%

Lets say you got 19 mpg at 55 mph, what would you get at 75 mph? I am having a very hard time trying to figure this one out.

Thanks in advance!

2007-09-21 21:26:04 · 5 answers · asked by Greg L 1 in Mathematics

During photosynthesis,______from the sun is converted to potential energy in plants?
1. chemical energy
2. heat energy
3. light energy
4. kinetic energy

Device Enerygy conversion
A : Chemical energy-------->eletrical energy
B : Electrical energy-------->heat and light enerygy
C: Electrical energy---------> kinetic energy
D: Kinetice energy--------->eletrical energy

1. A:battery B: fan C:dyanamo D: turbine
2. A:battery B:toaster C:elevator D: dynamo
3.A: elevator B: iron C: bell D: battery
4.A: clock B:battery C:drill D:gear

During photosynthesis,two substances A and B are produced. Excess of B is changed to C which turns iodine blue. Identify A,B,C
1.A: oxygen B: sugar C:starch
2.A: Sugar B:starch C:oxygen
3. A:Starch B sugar C:oxygen
4. A starch B: oxygen C:Sugar

PS: pls help me and explain to me - to be continued at next thread

2007-09-21 21:24:55 · 2 answers · asked by Anonymous in Other - Science

I'm just curious where did it go? There is so many penguins at the south pole. But where did it go?

2007-09-21 21:14:06 · 4 answers · asked by gary7k 1 in Zoology

How do you solve this equation: 18k-6k-14k=6

Please show your work. If you answer this, you are considered "smart" cause all the people i ask to solve this equation is too dumb.

2007-09-21 21:12:52 · 10 answers · asked by infamous_l00z3r 2 in Mathematics

Plz give logical and descriptive answers.

2007-09-21 21:11:16 · 4 answers · asked by Anonymous in Physics

i really need this one.....

2007-09-21 21:07:29 · 3 answers · asked by intifada 1 in Mathematics

2007-09-21 21:03:01 · 7 answers · asked by Anonymous in Geography

why do people get excitied to take it?? help me

2007-09-21 20:52:37 · 2 answers · asked by Anonymous in Medicine

2007-09-21 20:48:58 · 5 answers · asked by Anonymous in Zoology

2007-09-21 20:48:21 · 1 answers · asked by monicakryzelle_fortes 4 in Chemistry

2007-09-21 20:47:06 · 6 answers · asked by Anonymous in Zoology

Please be descriptive.

2007-09-21 20:46:54 · 5 answers · asked by Anonymous in Astronomy & Space

Derive an expression for the terminal speed vt of a sphere falling in a viscous fluid in terms of the sphere's radius r and density p and the fluid density n, assuming that the flow is laminar so that Stoke's law is valid. Hint: Use FBD

2007-09-21 20:46:09 · 3 answers · asked by Anonymous in Physics

2007-09-21 20:44:23 · 8 answers · asked by this3that 1 in Medicine

how do YOU help?

2007-09-21 20:42:25 · 6 answers · asked by Clara 2 in Earth Sciences & Geology

Let C(t) be the concentration of drug in bloodstream. As the body eliminates the drug, C(t) decrease at the rate that is proportional to the amount of the drug that is present at the time. Thus dC/dt =-kC(t) where k is positive number. If C(0) is the concentration at time t=0, find the concentration at time t.

help me on this question please.....

2007-09-21 20:40:59 · 1 answers · asked by wow_wow1127 1 in Chemistry

i was watching a corpse bride video and talking about pens and later on pens search came up in youtube but i dint wrote it is there any diabolic thing here is 3:33 am

2007-09-21 20:35:41 · 10 answers · asked by christian 1 in Paranormal Phenomena

2007-09-21 20:35:37 · 13 answers · asked by secret 1 in Geography

or does it act the same way water inside a cup, would, when you rotate the cup?...

give me a good reazon... this aint my homework, i totally randomly came up with this... as i looked at the sky.

think about it. we all know that wind is what mainly drives clowds around... however. Imagine there is not wind...

would the movement of the clowds be due to the rotation of the earth while the clowds stay in a single spot?...

any ideas?...

2007-09-21 20:30:46 · 4 answers · asked by alb_spec 2 in Physics

or does it act the same way water inside a cup, would, when you rotate the cup?...

give me a good reazon... this aint my homework, i totally randomly came up with this... as i looked at the sky.

think about it. we all know that wind is what mainly drives clowds around... however. Imagine there is not wind...

would the movement of the clowds be due to the rotation of the earth while the clowds stay in a single spot?...

any ideas?...

2007-09-21 20:30:25 · 4 answers · asked by alb_spec 2 in Earth Sciences & Geology

2007-09-21 20:24:51 · 6 answers · asked by Anonymous in Mathematics

How does leaning inwards towards the centre of the circular motion for a cyclist prevent him from slipping?

2007-09-21 20:20:42 · 3 answers · asked by Anonymous in Physics

2007-09-21 20:19:18 · 5 answers · asked by Anonymous in Mathematics

2007-09-21 20:16:37 · 3 answers · asked by Anonymous in Weather

Here in San Antonio's far NE side there is about 3 major cement factorys/parks. Next to all 3 there is big lakes/ponds. Why?

2007-09-21 20:16:25 · 4 answers · asked by Dude 4 in Geography

2007-09-21 20:15:52 · 4 answers · asked by HC 2 in Mathematics

i live in gustine california and over here its 12:15am.

2007-09-21 20:14:17 · 17 answers · asked by domenicathesims2player 3 in Geography

i love the rain
when it pitters and patters down the window pane
it makes the gardens grow
and the rivers flow
(and makes everything green again)
And that's why i like the rain :)

2007-09-21 20:13:54 · 2 answers · asked by Anonymous in Weather