Science & Mathematics - 25 July 2007

2007-07-25 11:01:46 · 5 answers · asked by Ashley S 1 in Biology

How many ounces of pure acid must be added to 20 ounces of a solution that is 5% acid to strengthen it to a solution that is 24% acid?

2007-07-25 11:01:27 · 1 answers · asked by wu_4533 2 in Mathematics

4. Solve the system of equations using the substitution method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is “no solution” or “infinitely many solutions.”
-3x + y = 1
5x + 2y = -4




5. Solve the system of equations using the addition (elimination) method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is “no solution” or “infinitely many solutions.”
-7x + y = 8
2x – y = 2




6. Solve the system of equations using the addition (elimination) method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is “no solution” or “infinitely many solutions.”
3x – 2y = -7
-9x + 6y = 21

2007-07-25 11:01:22 · 1 answers · asked by princessmommy05 2 in Mathematics

Mr. Strauss invests $4000, part at 6%, and part at 7%. His income from these investments in one year is $250. Find the amount invested at 7%

2007-07-25 10:57:52 · 3 answers · asked by wu_4533 2 in Mathematics

2007-07-25 10:55:21 · 6 answers · asked by John G 1 in Mathematics

For example, if someone was put on a strict diet to lose weight as a medical treatment to a health problem, but the person couldn't stick to it because of a sugar addiction, what would the doctor do?

2007-07-25 10:54:44 · 5 answers · asked by Anonymous in Medicine

In theory, it seems that this should be possible with a giant capacitor or something. I am no electrical wiz', but it seems that the earth gives up more "free" electricity than we can even come close to creating ourselves. Shouldn't we figure out a way to use it? I understand it would be very regional, but so is wind, solar, hydro, geothermal, etc.

2007-07-25 10:48:28 · 5 answers · asked by luke_the_duke 2 in Weather

max points to whoever answers it correctly first (with explanation)

2007-07-25 10:46:37 · 10 answers · asked by Anonymous in Other - Science

Simplify the expression.

- 4x + 4y / - 4y + 4x

1
-4
-1
4

2007-07-25 10:45:43 · 4 answers · asked by Anonymous in Mathematics

Reversible equation for the esterfication and hydrolysis of glyceryl ethanoate.

2007-07-25 10:44:21 · 2 answers · asked by tara_05_87 1 in Chemistry

You begin socking away $200/month in an account that pays 6%, compounded monthly.After some months you'll have enough money in the account so that you can stop making payments and start drawing out $200/month--forever. How many months will it take?

2007-07-25 10:43:44 · 3 answers · asked by soccer 2 in Mathematics

I already know they have a life cycle of about 15-20 yrs until the radiation destroys their capability to transmit and recieve, but what happens to them after that.

2007-07-25 10:36:42 · 12 answers · asked by Zealot18 1 in Astronomy & Space

I have noticed that some pine trees grow side ways even though they are in the sun.I was wondering why

2007-07-25 10:25:39 · 6 answers · asked by Anonymous in Botany

In 10 seconds an object traveled 30 feet. If the object traveled the same distance every second, how many feet did it travel in 7 seconds????

Can someone plz tell me how to do problems like this?

2007-07-25 10:24:18 · 19 answers · asked by Anonymous in Mathematics

I found this video, can be seen here http://www.metacafe.com/watch/718152/how_to_turn_water_into_ice_in_seconds/,
that freezes a cup of water almost instantaneously. One of the posted comments explains the phenomenon, allegedly called Graham Shrinder Effect, but is not very clear. Is this something bogus or does the explanation make sense to anyone? It mentions this "deromindal corpus attraction" that I could find no reference of. Thanks.

2007-07-25 10:23:23 · 6 answers · asked by EverCrack 1 in Physics

how can i calculate an average if the first number is only worth 15%, the 2nd 25%, the 3rd 25% and the 4th 35%?? its for my grades at school!! please help!

2007-07-25 10:22:48 · 4 answers · asked by Anonymous in Mathematics

y=tan x, (pi/4,1)

Any help would be great. Thanks!

2007-07-25 10:22:17 · 3 answers · asked by spire8901 2 in Mathematics

2. Solve for x. Collect xs on the LEFT side. The solution should be presented with x first, the correct inequality symbol, then the number.
- 7x + 2 + x – 10 > -3(x – 1)


3. Name the coordinate described here:
From the origin, the point is four places to the left and six places down.


6. The linear equation x = -4 graphs as a horizontal/vertical/diagonal line (choose the correct label and type it below).

2007-07-25 10:17:29 · 3 answers · asked by princessmommy05 2 in Mathematics

I need your help. Briefly explain to me the roles of a jockey pump and a diesel engine fire pump in a high rise building. This would be for a five story 100,000 sq ft structure with it's sprinkler water supply coming from the city's main line. Which of these 2 pumps would need to have backup battery or generator power in case of an outage. And if the city water line was broken(hurricane Katrina) how could this cause the diesel pump to run itself dry until it overheated(the oil in the engine was like tar). Just need to know the basics for an interview. Thank you Thank you.

2007-07-25 10:15:31 · 4 answers · asked by killmylandlord 4 in Engineering

I am trying to find out if my career choice will give me a chance to have an impact on others, whether directly or indirectly.
For example, engineers help doctors by designing and building the equipment they use................ Am looking for the connection between Engr. and all other careers.
Thanks

2007-07-25 10:14:49 · 1 answers · asked by EdS 1 in Engineering

2007-07-25 10:10:52 · 3 answers · asked by mb75205 1 in Zoology

2007-07-25 10:09:53 · 6 answers · asked by Anonymous in Chemistry

I have a summer assignment in a textbook and this is one of the questions. I can't find it in the book or online!!!! Please help :) thank you so much in advance

2007-07-25 10:09:34 · 9 answers · asked by Kaila 2 in Chemistry

how is did absolutely nothing produce something. Or how could matter always exist in a time based dimension. This is totally illogical because something cannot be infinitely old because it would require an infinite amount of time.

2007-07-25 10:09:20 · 22 answers · asked by Anonymous in Astronomy & Space

Determine each of the following a,b,c
the y-intercept(state the formula then the answer)
the x-intercept(state the formula then the answer)
the axis of symmetry (state the formula then the answer)
the vertex(state the formula then the answer)

2007-07-25 10:05:05 · 6 answers · asked by big red 1 in Mathematics

This is for the preparation of aspirin by using salicylic acid and acetic anhydride with phosphoric acid as a catalyst.

2007-07-25 10:05:02 · 3 answers · asked by Anonymous in Chemistry

Since we throw our fruit seeds into the garbage, i was wondering if it was possible for a tree to grow in the landfill and would it be like a mutated fruit tree?

2007-07-25 10:04:07 · 4 answers · asked by Calvin & Hobbes 4 in Botany

2007-07-25 10:00:44 · 7 answers · asked by Anonymous in Astronomy & Space

1.Who is generally credited with inventing the first telescope?

2. Who first used the telescope to observe objects in space?

3. What is the name of Earth's galaxy?

4. What is a constellation and please name one?

5. On what space shuttle was the Hubble space shuttle luanched on?

2007-07-25 09:59:25 · 5 answers · asked by Bluemini93 2 in Astronomy & Space

2007-07-25 09:58:56 · 8 answers · asked by Scrap 22 2 in Mathematics