Science & Mathematics - 13 September 2007

evaluate each algebraic expression.

2007-09-13 10:09:06 · 3 answers · asked by Eman K 1 in Mathematics

2007-09-13 10:05:12 · 4 answers · asked by vincentchan16@sbcglobal.net 2 in Chemistry

What is the point of intersection of the Line and Plane?

2007-09-13 10:02:21 · 1 answers · asked by Anonymous in Mathematics

I'm an AS level student and I was wondering what exactly is the control of a chemical experiment. There's an example of an experiment which involves extracting potato juice from a potato and adding it to glucose and adding iodine to discover that the potato juice has turned the glucose into starch. Apparently the control of the experiment is an enzyme. But why is it an enzyme?

2007-09-13 10:00:53 · 3 answers · asked by Anonymous in Chemistry

huh???

2007-09-13 09:56:36 · 7 answers · asked by meee 2 in Mathematics

High voltage switchgear usually applies interrupting arc quenching chambers to extinguish the arc between two contacts. a) Which principles are applied to extinguish the arc? b) Explain the extinction of the arc by an arc quenching chamber. Make some drawings to support your explanation. c) Which materials are normally used for the contacts? Which gas is used? Why?

2007-09-13 09:52:54 · 3 answers · asked by meesogynist 1 in Engineering

length of the curve from x=1 to x=3, y= ((x^3)/3) + (x/4)

I get to a point where I have to take the integral of a square root, but the inside function does not have the derivative in the integral so I am stuck and can't go any further.

2007-09-13 09:51:36 · 3 answers · asked by Anonymous in Mathematics

2007-09-13 09:48:01 · 3 answers · asked by sid 2 in Engineering

5/12 and 3/20

2007-09-13 09:41:02 · 4 answers · asked by baby166_99 2 in Mathematics

help me pls...im confused!!!

2007-09-13 09:40:26 · 6 answers · asked by meee 2 in Mathematics

(x1, y1) and (x2, y2).

b) Find a parametrization for the line segment with endpoints (x1, y1) and (x2, y2)

2007-09-13 09:39:50 · 2 answers · asked by hello 1 in Mathematics

The patient was prescribed suppositories to be inserted rectally for nausea and vomiting. What drug administration route is being used in this scenario?

a. gastrointestinal
b. intramuscular
c. parenteral
d. subcutaneous

2007-09-13 09:38:28 · 8 answers · asked by crismarie 4 in Medicine

4x(2x – 1) + 5x(3x + 1)

2007-09-13 09:37:27 · 4 answers · asked by baby166_99 2 in Mathematics

(CH3)2CHCH2OH

(all the numbers shouod be subscript)

Please could you write the answer in like this for example:
2-methyl-2-ol

2007-09-13 09:34:38 · 1 answers · asked by Muppet 2 in Chemistry

Do you believe that we could go back in time, if it has already happened won't there just be nothing there, I can never get my head around time travel films where they go back in time to save someone wont they have to keep doing that for all eternity, loop it if you like. What are your views on time travel, I have heard that we are getting closer to achieving it.

2007-09-13 09:34:11 · 14 answers · asked by jo 3 in Astronomy & Space

A patient with bronchitis is directed to take Humabid. What type of medication is being prescribed?

a. Expectorant
b. Antihistamine
c. Antiemetic
d. Diuretic

2007-09-13 09:34:08 · 2 answers · asked by crismarie 4 in Medicine

Me and my class had an activity in Chem about elments involved in our environment. This question popped out and I have no idea what to write. Please help. TY

2007-09-13 09:33:11 · 35 answers · asked by Nayden 2 in Chemistry

Consider a 1.50g mixture of magnesium nitrate (Mg(NO3)2) and magnesium chloride (MgCl2). After dissolving this mixture in water, 0.500 M silver nitrate (AgNO3) is added dropwise until precipitate formation is complete. The mass of the white precipitate formed is 0.641g.

a) Calculate the mass percent of the magnesium chloride in the mixture.

b) Determine the minimum volume of silver nitrate that must have been added to ensure complete formation of the precipitate.

2007-09-13 09:32:50 · 1 answers · asked by tay 3 in Chemistry

2007-09-13 09:31:40 · 3 answers · asked by Jeffrey J 1 in Mathematics

2007-09-13 09:29:32 · 12 answers · asked by baby166_99 2 in Mathematics

2007-09-13 09:29:06 · 79 answers · asked by Anonymous in Physics

I noticed he has a turtle face. He swims ALL the time. I saw those Animorphs reference books at the mall and I'm thinking he might be ONE! Could he seriously be a turtle? I mean I've never seen him with his shirt off so I can't tell if he has a shell but if he was one of these Animporh people/animals would he?? I know this sounds weird but the idea of neighbor morphing into a turtle makes me nervous. I have noticed the weeds NEVER grow on that side of my yard. Turtles eat stuff like that don;t they? Any help you can give me would be much appreciated. THANKS!

2007-09-13 09:28:28 · 12 answers · asked by Anonymous in Zoology

HELP!!! how do i solve it???

2007-09-13 09:28:15 · 12 answers · asked by meee 2 in Mathematics

2007-09-13 09:24:56 · 3 answers · asked by MS.NEET 1 in Weather

2007-09-13 09:24:23 · 6 answers · asked by tootybug31 1 in Geography

2007-09-13 09:21:04 · 3 answers · asked by m_tricia 3 in Physics

1. I'm looking for the density. I was given the equation Density=Mass/Volume. The mass is 4.65 x 10^6 g. The volume is 5.374 x 10^-3 mL. Would the answer be 0.865 x 10^9 g/mL?

2. Given that the volume is 13.6 x 10^4 mL, and the density is 6.8 x 10^4 g, what is the mass? So the equation would be M=VD, right? My answer was 92 x 10^8 g^2. Is that correct?

3. I had to find the volume. I'm not sure if this is right, but I changed the equation to V=M/D. The given mass was 6.2 x 10^6 and the given density was 12.4 x 10^-6. I got the answer 0.5 x 10^36, which I think may be wrong in multiple different ways.

Thank you!

2007-09-13 09:19:43 · 4 answers · asked by Me 7 in Mathematics

Florence Nightingale
nursing

2007-09-13 09:13:07 · 2 answers · asked by Anonymous in Medicine

Is there evidence for this or is it theoretical? Can epigenetics lead to speciation in the absence of mutation? Thanks.

BTW: I am NOT a creationist and I do know what a mutation is and what epigenetics marks are.

2007-09-13 09:13:01 · 3 answers · asked by Anonymous in Biology

Three half-full water tanks are connected with pipes as shown here:
http://i7.tinypic.com/6gdvqdv.gif

The numbers on the right indicate elevations with respect to the floor (ignore viscosity and other losses)

2007-09-13 09:11:24 · 2 answers · asked by Alexander 6 in Physics