Science & Mathematics - 27 January 2007

2007-01-27 13:23:10 · 4 answers · asked by Link 4 in Biology

2007-01-27 13:22:42 · 10 answers · asked by bourassachristopher 1 in Other - Science

solve each system of equations using substitution. Show all work. write the solution as an ordered pair.

3x+y=4
6x+2y=7

heres another one:

x=0.5y+3
2x-y=6

graph the two lines
write both equations in slope-intercept form

2007-01-27 13:22:28 · 9 answers · asked by jenjen 3 in Mathematics

When a weather report says there will be SW winds, does this mean the wind is blowing to SW or from SW?

2007-01-27 13:22:25 · 11 answers · asked by Anonymous in Weather

It's true, they do, but how?

2007-01-27 13:19:47 · 2 answers · asked by Link 4 in Biology

2007-01-27 13:17:44 · 12 answers · asked by Michael C 2 in Mathematics

at what velocity is moving the light of the headlight?

2007-01-27 13:16:21 · 13 answers · asked by Lost. at. Sea. 7 in Astronomy & Space

Need For School Please Help Im desperate

2007-01-27 13:16:19 · 3 answers · asked by bk54de 1 in Astronomy & Space

2007-01-27 13:16:02 · 6 answers · asked by mikelarryh2o 2 in Mathematics

2007-01-27 13:11:17 · 11 answers · asked by wiggafree 1 in Mathematics

A speedboat could travel at 4 times the speed of the current. Thus, it could travel 700 miles downriver in 2 hours more than it took to travel 400 miles upriver. What was the speed of the boat in still water.

plz use a system of equations and explain thoroughly

2007-01-27 13:11:14 · 4 answers · asked by Kasra 2 in Mathematics

Could anyone tell me how to solve 27x^3 =1 ? thanks alot

2007-01-27 13:10:59 · 10 answers · asked by Anonymous in Mathematics

2007-01-27 13:10:45 · 4 answers · asked by Anonymous in Mathematics

3/5, 9/16, 7/8, 2/3

2007-01-27 13:07:59 · 13 answers · asked by derek 1 in Mathematics

Am a stupid freshman in college? I hate math...
I am a very intelligent student.
A's in Biology always...
A's in Literature always...
A's in History always....
A's in Art always...
but when it comes to math my brain doesn't connect..or something. I love college..I really want to be a professional and go to graduate school but math is just not for me....what career can I take? help me please???!!! how do you all geniuses do it???

2007-01-27 13:07:56 · 8 answers · asked by Anonymous in Mathematics

2H2(g) + O2(g) --> 2H2O(g) ΔH = −486.6kJ



Which of the following are true statements for the above chemical reaction ?



a) A phase change is not involved


b) Two moles of hydrogen gas react with one mole of oxygen gas to
produce two moles of water vapor


c) Energy is given off to the surroundings


d) If the reaction takes place at constant pressure, q = −483.6 kJ


e) ΔH for reacting four moles of hydrogen gas with two moles of
of oxygen gas is −483.6 kJ

2007-01-27 13:06:56 · 7 answers · asked by Whatever 1 in Chemistry

9/28 + 3/z+2 = 3/4

In other words:
9 over 28 + 3 over z+2 = 3 over 4

2007-01-27 13:05:46 · 8 answers · asked by Anonymous in Mathematics

How much heat (kJ) must be removed in order to change 2.91 moles of steam at 114.0 oC to water at 51.0 oC ?


The specific heat capacity of water vapor is 2.01 J g-1 oC -1


Use a negative sign in your answer if heat is removed.


Enter a numeric answer only, do not enter units.

2007-01-27 13:05:06 · 1 answers · asked by Whatever 1 in Chemistry

2007-01-27 13:04:14 · 6 answers · asked by Michael C 2 in Geography

One person says that when a comapss is taken across the equator, it turns around and points in the opposite direction. Another person says that people in the Southern Hemisphere use the south magnetic pole of the compass to point toward the nearest pole.

Which one is correct and why?

2007-01-27 13:03:12 · 2 answers · asked by Melissa 2 in Physics

2007-01-27 13:01:18 · 2 answers · asked by Yea Yea 4 in Other - Science

2007-01-27 12:59:52 · 6 answers · asked by Anonymous in Biology

2007-01-27 12:56:16 · 3 answers · asked by Anonymous in Physics

How would you BEGIN to integrate this problem? I do not need you to solve the problem for me. Thanks!

2 / ( e ^ (-x) + 1 ) dx

2007-01-27 12:55:17 · 7 answers · asked by AlaskaGirl 4 in Mathematics

2.-What is the perimeter of a 3in frame around a 11”x14” (11 inches by 14 inches) photo? Show your work.
3.-A backyard has a swimming pool that measures 20ft by 35ft. The backyard has a perimeter of 370ft and a width of 80ft. What is the area of the backyard not including the pool?

the answer for the number 1 i have 120 i am not sure about it

2007-01-27 12:54:33 · 7 answers · asked by princess 1 in Engineering

2007-01-27 12:52:15 · 3 answers · asked by s.tsioros@rogers.com 1 in Geography

2007-01-27 12:51:55 · 1 answers · asked by Neisha S 1 in Mathematics

Is it possible that humans have tested weapons of mass destruction on the moon in the past . . . i.e. nuclear weapons? If so, is that why the far side has so many craters? I understand the universe is a violent place, which leaves me pondering why earth has had only one mass extinction that we know of due to deep impact. I mean, if the craters on the moon are due to meteors then surly more than one should or will hit earth that will/should have cause noticable damage...weather, movement, tilt, etc. Also, why dont earths gravity pull in meteors like other planets do?

2007-01-27 12:49:53 · 18 answers · asked by crit 1 in Astronomy & Space

2007-01-27 12:46:34 · 9 answers · asked by gmsgoad 1 in Mathematics

I know this is impossible, but humor me, If you had a straight hole that went completely through the Earth and dropped a pebble in would it fall through or would gravity stop it dead straight in the center?

2007-01-27 12:46:20 · 18 answers · asked by the walrus 1 in Physics