Science & Mathematics - 9 December 2007

I just don't know how to do it. I've worked out the gradient is 1.4, so I guess is it 1.4x + by +c? The line goes through 8, 2.
Can someone please explain how to do it? A-level maths mock tomorrow :/

2007-12-09 05:13:51 · 1 answers · asked by Jethro 5 in Mathematics

2007-12-09 05:13:17 · 2 answers · asked by Answer Seeker 1 in Mathematics

how are you supposed to answer this i dont gett it.,

Pretend that you are the size of an atom, observing a reaction between a potassium atom and a fluorine atom. Write an account of the formation of an ionic bond as the atoms react. Tell what happens to the valence electrons on each atom and how each atom is changed by losing or gaining electrons.

2007-12-09 05:12:52 · 1 answers · asked by Emily:) 1 in Physics

2007-12-09 05:09:36 · 4 answers · asked by eyez 1 in Weather

I recently asked my Maths teacher what he though 1/0 was. He told me it was infinity. I didn't beleive him but most other Maths teachers say the same thing. I can see why they could think this, since if you divide 1 by a smaller and smaller number the result increases. Since 0 is the smallest possible number, the result will be the biggest possible number, infinity.

However, most americans that I know (I'm english) think the opposite, they think the answer is either undefined or 0. I agree.

I would like to know the worldwide mathmetician's opinion on this matter, if there is one.

P.S. I've asked 'Dr Math'(google it) about this and it gave me no straight answer.

2007-12-09 05:09:33 · 4 answers · asked by blank 4 in Mathematics

2007-12-09 05:08:05 · 3 answers · asked by w00t w00t 1 in Geography

Should Stingrays Be Trusted? I say NO WAY!!

Your view?

2007-12-09 05:07:37 · 2 answers · asked by Anonymous in Zoology

Help

2007-12-09 05:07:12 · 5 answers · asked by qutgal 1 in Mathematics

aliens? have you ever seen one?did it have a space ship.

2007-12-09 05:04:37 · 12 answers · asked by louise d 6 in Astronomy & Space

8. A balloon has a volume of 2500.0 ml on a day when the temp is 30.0°C. If the temperature at night falls to 10.0°C, what will be the volume of hte balloon if the pressure remains constant?

2007-12-09 04:56:08 · 3 answers · asked by Lorr C 1 in Chemistry

doesnt it have to do with seismic waves or something?

2007-12-09 04:53:05 · 1 answers · asked by Anonymous in Astronomy & Space

how long is the diagonal of a square that has an area of 1000 square centimeters? express your answer as a decimal to the nearest tenth. I came up with .5cm is that correct?

2007-12-09 04:52:54 · 9 answers · asked by sheba40 1 in Mathematics

six friends commute to work together.Each week,the gas,parking and tolls cost $114.If they split the costs equally,how much does each friend pay per week toward the commuting costs?

(1) $17

(2) $18

(3) $19

(4) $108

(5) $120

2007-12-09 04:52:38 · 5 answers · asked by Anonymous in Mathematics

2x-5y=1 and -3x+7y= -3


2) What is the solution to this system of equations?
2x+y=7
3x-y=3

2007-12-09 04:52:24 · 1 answers · asked by yankeefan13x 1 in Mathematics

90Sr38→ 90Y39+ ?
proton
beta particle
neutron
alpha particle
gamma ray

2007-12-09 04:52:21 · 3 answers · asked by sonia 1 in Chemistry

A Cruise liner travels with the water current for 1000 miles. On the way to the destination, the water current helps and makes the travel time shorter. The speed of the water current is 5 miles an hour. The round trip takes 45 hours. How fast would the speed of the Cruise liner be if there was no current?

2007-12-09 04:52:12 · 1 answers · asked by Anonymous in Mathematics

2007-12-09 04:45:30 · 4 answers · asked by vivica 1 in Mathematics

Has anyone had a paranormal experience?? It seems that throughout my childhood I had them all the time, and then into my 20's, but after I had my first child in my early 30's it doesn't happen as often. Every now and then something will happen. My sister use to say I had a "gift" to know what was going to happen before it actually happened. I lived in a home for nearly 8 years that I would see a ghost and super werid things happened on a daily basis, but now?? Not much, just sometims I will know something is going to happen right before it does happen. So I'm curious do other people have this too?

2007-12-09 04:36:43 · 16 answers · asked by candygirl 2 in Paranormal Phenomena

What are we going to do about
Cosmic Rays from Black Holes?

2007-12-09 04:35:11 · 7 answers · asked by Anonymous in Astronomy & Space

What makes a true mathematician?

What is the difference between someone who is good at math and a mathematician?

2007-12-09 04:33:25 · 3 answers · asked by Anonymous in Mathematics

Help me to find these unknown values?
1. Let p and q be real numbers and let f be the function defined by the piece function:

f(x) = 1+2p(x-1)+(x-1)^2 [x less or equal to 1]
qx+p [x greater than 1]

a. Find the values of p and q for which f is differentiable at x=1.
b. Using your values of p and q, is f" continuous?

2007-12-09 04:29:21 · 2 answers · asked by Anonymous in Mathematics

they were too small for the microscope, but they were moving and definitely something living. How would I classify them?

2007-12-09 04:25:02 · 3 answers · asked by tmmz1107 2 in Botany

2007-12-09 04:22:08 · 2 answers · asked by me samir4u 1 in Physics

log(base6) 9+log (base6) 4

2007-12-09 04:19:30 · 3 answers · asked by star baller 360 5 in Mathematics

2007-12-09 04:16:41 · 4 answers · asked by Anonymous in Astronomy & Space

The population of the world was about 5.3 billion in 1990. Birth rates in the 1990s ranged from 35 to 40 million per year and death rates ranged from 15 to 20 million per year. Lets assume that the carrying capacity for world population is 100 billion.

a) Write the logistic differential eq. for these data. (because the initial pop is small compared to the carrying capacity, you can take k to be an estimate of the initial relative growth rate).
b) use the logistic model to estimate the world population in the year 2000 and compare with the actual population of 6.1 billion.
c) Use the logistic model to predict the world population in the years 2100 and 2500.
d) What are your predictions if the carrying capacity is 50 billion?

show work/steps plz..thanks!

2007-12-09 04:12:15 · 1 answers · asked by Anonymous in Mathematics

2007-12-09 04:11:30 · 5 answers · asked by Book of Changes 3 in Mathematics

When the universe was much smaller at the dawn of the time , 13+ billions years ago, would the more concentrated matter/ mass not distort space time through gravity on a completely different scale than today? How much would this affect the light we see now? More red shifted etc than it really should be if the universe had always been the same size?
I am thinking about this as gravitational lensing of early galaxies suggests that light takes longer to get here than if it came here directly without lensing. Would the considerably smaller universe not exaggerate this effect dramatically? Then tailing off the closer to the present time it gets.
This confusion also concerns me in relation to question of how fast the universe is expanding as the further you look back in time the more space time would look curved from our point of view.

If you read all then I am already in your debt. this confusion has concerned me for ages. Please put me out of my ignorance thanks a billion remainz

2007-12-09 04:11:26 · 9 answers · asked by semiconductor 1 in Astronomy & Space

weather oriented, concerning snow and ice.

2007-12-09 04:08:09 · 4 answers · asked by Anonymous in Weather

Are gamma rays the most dangerous?

Do nuclear explosions occur in space?

What is a good opening paragraph for a report about gamma rays (don't give any information just cool sayings and facts for opening paragraph)

2007-12-09 04:05:53 · 7 answers · asked by Anonymous in Astronomy & Space