Science & Mathematics - 5 August 2007

Solve the system by addition.
5x – 4y = –5
x – 2y = –7

2007-08-05 15:05:53 · 8 answers · asked by sittinncat 1 in Mathematics

please answer this with workings out please
Two circular discs are touching. The diameter of the larger disc is seven times that of the smaller disc, and the distance between their centres is 28cm.
What is the diameter of the smaller disc?
thanks to anyone smart enough to work this out lol ; )

2007-08-05 15:05:08 · 3 answers · asked by Anonymous in Mathematics

A number is called "wise" if it has exactly 5 positive integer factors. What percent of the first 20 positive integers are "wise"


James took 2/5 of the wrapped taffy from a large candy box. Bill removed 2/3 of the remaining taffy. If Bill removed 26 pieces of taffy from the box, how many pieces of taffy were in the box before James took any?

2007-08-05 15:04:46 · 5 answers · asked by Anonymous in Mathematics

This has happened to me many times.Especially when numbers are involved.I know what your thinking,go to a casino right?I have and the results are amazing.Is this a form of cheating,or taping into something i should'nt be messing with.Perhaps financial gain could be tragic.

2007-08-05 15:04:36 · 14 answers · asked by Anonymous in Parapsychology

Describe the graph. Indicate whether the line would be a solid or a dotted line. Indicate which quadrant would be shaded
x + y = 4
–x + y = 2

2007-08-05 15:02:38 · 2 answers · asked by sittinncat 1 in Mathematics

without any kind of support or the person being connected to a space ship. just curious.

2007-08-05 14:57:08 · 15 answers · asked by DARK WOLF 2 in Astronomy & Space

Formula:
-b +/- √b²-4ac / 2a

prob.
x²+6x-4=0
plug values.

1) -6 +/- √36-4*1*-4
2) -6 +/- √52

I retry. Complete Square way.

(x+6/4)²-36/16=4 +36/16
(x+3/2)²=100
\ect...Which will turn out different. BS.

God SMACK this is G@y.
Damn. Help, Quadratic are so stupid shyt. Can't even solve this. Damn.itt

2007-08-05 14:52:46 · 6 answers · asked by Anonymous in Mathematics

Does anyone know what kind of fruit this is?
They are about the size of olives, but taste like plums. The skin is a dark indigo color, but the flesh is orange and red, like plums. It contains a long, pointed, flat pit.
Here are some pictures I took: http://www.deviantart.com/deviation/61539586/
http://www.deviantart.com/deviation/61539522/

2007-08-05 14:52:16 · 10 answers · asked by Emilie 3 in Botany

5x-1 3x +9 y+8 Y3-6

2007-08-05 14:50:10 · 2 answers · asked by Anonymous in Mathematics

2007-08-05 14:50:04 · 3 answers · asked by Frantisko 2 in Weather

g (x) = 3x^2 + 5x-3

state the domain

thank you

2007-08-05 14:45:16 · 3 answers · asked by peanut1 1 in Mathematics

How dorenewability and pollution relate?

2007-08-05 14:44:43 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-05 14:41:11 · 3 answers · asked by d w 1 in Mathematics

Customers's arrival rate is 1/2 per min. Find the probability that the 250th customer enters on the last hour of an 8-hr working day.

2007-08-05 14:29:53 · 1 answers · asked by kayedimanche 2 in Mathematics

I mean like how many more pound are added to you?
Does this question depends on the amount of water?
If so I am talking about a Olympics size pool but only 5 feet tall

2007-08-05 14:28:29 · 1 answers · asked by Ireqiredlotofhelp 1 in Physics

this is related to physics...topic is projectile motion

2007-08-05 14:25:28 · 2 answers · asked by rexie13 1 in Physics

At least how fast it can go.

2007-08-05 14:24:26 · 7 answers · asked by Ireqiredlotofhelp 1 in Physics

2007-08-05 14:23:48 · 6 answers · asked by amazonwoman1970 1 in Paranormal Phenomena

i'd like to hear some ideas on terraforming mars, keeping in mind that it is a "dead" planet in that it has no magnetosphere to protect it from the sun's radiation. also keep in mind that i don't mean that"dead" also means hopeless. hmmmm...could just starting its core back up somehow do the whole shabang?

2007-08-05 14:20:48 · 9 answers · asked by Anonymous in Astronomy & Space

Ok, this is not really a question. I had to put the interrogative line so as to fulfill the pestering question mark which displays automatically at the end.

I had some good times here in YA mathematics, but now I finally feel what it really is: an out-of-school club for whining K12 kids massively poor at arithmetic, willing to have their trivial homeworks done without even the self-pride of trying by themselves. In this environment, only the quantity of answers counts. No real interest in the charm of a proof (and by the way, the point system is obviously too shallow to adequately represent one's efforts towards the beauty).

I'll get back to my cave keeping the fire of curiosity alive. I took from the library "a concise introduction to the theory of numbers" by Alan Baker. May I suggest you all take a good book and read it, to heck with YA!

Thank you for your attention at my long and uncalled-for rant. Goodbye and good luck with your studies.

2007-08-05 14:18:54 · 17 answers · asked by Anonymous in Mathematics

but its not storming, its just dark and a little windy. huh?

2007-08-05 14:15:51 · 9 answers · asked by meg *__* 5 in Weather

I have been reading about all the money used to send ships to Mars and to Jupitor' rings to explore etc, but don't you think it is more appropriate to use all that money to benefit man here on Earth. The bridge colapsed in Minn, and many bridges in NY and NJ are obsolete, so don't you think all that money would be more wisely spent on rebuilding or fixing or making new bridges, or should more bridges fail. What good is it if we can go to outer space if we can't go into the next state?

2007-08-05 14:13:01 · 15 answers · asked by joan 4 in Astronomy & Space

It says "Marijuana may increase Sedation". I do not plan on smoking when I take these, but if its in my system, say I smoked last night, but took one today, I am not high anymore, but obviously its still in my system.. is that okay?

2007-08-05 14:07:03 · 5 answers · asked by Anonymous in Medicine

2007-08-05 14:05:04 · 6 answers · asked by Fullfigured_Kitten 1 in Mathematics

After the 48 is the symbol for Pi. What does this mean?

2007-08-05 13:58:17 · 7 answers · asked by Meghan M 1 in Mathematics

I know its the rate in which your body burns calories...but please explain more in detail. Thnx.

2007-08-05 13:57:13 · 5 answers · asked by Missy 2 in Medicine

According to Brian Greene, The Fabric of the COSMOS (his CDs), if the whole universe could be reduced to the size of earth, the part of it that would be available to us for observation would be the size of a grain of rice; that the light produced by distant planets and galaxies have not yet had time to reach us, and won't until well after the earth and our solar system has long gone out of existence.

If that is so, then how can astronomers say that they have looked as far back as the first star systems at the edge of the universe?

2007-08-05 13:55:22 · 6 answers · asked by Bob D1 7 in Astronomy & Space

Assume that a steel pipe is embedded in the concrete floor of a bare room. The inside dia. of the pipe is .06 inches larger than the dia.of a ping-pong ball that is resting at the bottom of the pipe. You are in the room with 6 other people with the following objects: 100 ft of clothesline, A carpenter's hammer ,A chisel, A box of wheaties, A file, A wire coat hanger, A monkey wrench, A light bulb. List as many ways as you can think of to get the ball out of the pipe without damaging the ball,tube,or floor.

2007-08-05 13:52:31 · 4 answers · asked by comethunter 3 in Physics

2007-08-05 13:47:36 · 2 answers · asked by spfxart408 1 in Astronomy & Space

A student measures the potential of a cell made up with 1 M CuSO4 in one solution and 1 M AgNO3 in the other. There is a Cu electrode in the CuSo4 and an Ag electrode in the AgNO3, and the cell is set up in a "voltmeter." She finds that the potential, or voltage, of the cell, E^0cell, is 0.45 V, and that the Cu electrode is negative

a)At which electrode is oxidation occurring?
b)Write the equation for the oxidation reaction.
c)Write the equation for the reduction reaction.

d)If the potential of the silver, silver ion electrode, E^0Ag+, Ag is taken to be 0.000 V in oxidation or reduction, what is the value of the potential for the oxidation reaction, E^0Cu, Cu2+oxid? E^0cell=E^0oxid + E^0red.

e) If E^0Ag+, Agred equals 0.80 V, as in standard tables of electrode potentials, what is the value of the potential of oxidation reaction of copper, E^0Cu, Cu2+oxid?

f) Write the net ionic equation for the spontaneous reaction that occurs in teh cell that the student studied.

Help

2007-08-05 13:45:48 · 1 answers · asked by Anonymous in Chemistry