Science & Mathematics - 19 November 2006

Solve Each System of Equations: (please show the process to the best of your ability)

17.
5x+7y=-1
-2y+3z=9
7x-z=27

18.
r-s+3t=-8
2s-t=15
3r+2t=-7

During class we learned to pick 2 equations and solve by using substitution & elimination. I know how to solve with 2 equations I'm just not sure which ones to pick.

2006-11-19 08:26:59 · 4 answers · asked by adorkable_pink18 2 in Mathematics

2006-11-19 08:26:47 · 3 answers · asked by suzyQ1956 1 in Biology

A copper block rests 30.0cm from the center of steel turntable. The coefficent of static friciton between the two is 0.53. The turntable start from rest and rotates with a constant angular acceleration of 0.50rad/s^2. After what time internal will the block start to slip on the turntable? (Hint: The normal force in this case equals the weight of the block.)

2006-11-19 08:26:37 · 2 answers · asked by lauren u 1 in Physics

A website would be preffered, as I can't find one.

2006-11-19 08:25:57 · 1 answers · asked by Flippy 1 in Physics

No need to get very specific. In general, how does this feature work?

2006-11-19 08:22:14 · 1 answers · asked by Ubi 5 in Engineering

2006-11-19 08:21:22 · 5 answers · asked by Nora 1 in Astronomy & Space

A crate of 36 grape fruit has a total mass of 4 kg. When 12 grape fruit are removed, the total mass is 3 kg. determine the mass of the crate and the mass of one grapefruit.--- can u tell let x equal ??....let y equal ??...and what are the 2 equations?? thanks for taking ur tyme

2006-11-19 08:21:12 · 3 answers · asked by avant1991 3 in Mathematics

Find the radious of a circle which a 62.8 degree central angle cuts of an arc length of 18.4 centimeters

2006-11-19 08:20:25 · 3 answers · asked by Levi M 1 in Astronomy & Space

2006-11-19 08:18:47 · 4 answers · asked by ibid 3 in Biology

2006-11-19 08:18:39 · 7 answers · asked by beauty 1 in Zoology

2006-11-19 08:17:43 · 3 answers · asked by me 1 in Biology

If two objects can influence each other through gravity,

if one was say, a light year away from the other and it moved suddenly, how long would it take before the effect was felt on the other object?

Would it be faster or slower than light speed?

2006-11-19 08:16:50 · 5 answers · asked by Bill N 3 in Astronomy & Space

2006-11-19 08:15:49 · 3 answers · asked by micheal 1 in Zoology

and i know that disney made them mean and i didnt like that,,,, but they are really not too bad.

2006-11-19 08:15:21 · 7 answers · asked by </3 3 in Zoology

It was too bright in my neighborhood to see anything. :(

2006-11-19 08:14:13 · 7 answers · asked by royrox 5 in Astronomy & Space

solve the following simultaneous equations

1.4x-y=5
2x+y=-2

plz dont just give me the answer show me how you did it plz xxx

2006-11-19 08:13:47 · 9 answers · asked by laura 1 in Mathematics

2006-11-19 08:12:58 · 6 answers · asked by Kitty 1 in Biology

electromagnetic

2006-11-19 08:12:20 · 7 answers · asked by blink 1 in Physics

2006-11-19 08:11:33 · 3 answers · asked by ibid 3 in Biology

2006-11-19 08:11:08 · 2 answers · asked by Anonymous in Physics

2006-11-19 08:09:11 · 9 answers · asked by ........ 3 in Zoology

A bobsled team with a total mass of 198.4 kg leaves a run that begins 248.8 meters above the finish point. The bobsled takes 1 minute and 8 seconds to travel 2 km. What fraction of the sled's initial potential energy was converted to kinetic energy? (Ans = 18%)

Thanks in advance.

2006-11-19 08:09:07 · 1 answers · asked by Stev 1 in Physics

1. Have temperatures actually been rising?
2. Is it too early to be making predictions for the future?
3. Is global warming driven by people or a natural cause?
4. Could continued warming benefit some regions?

-What are both sides of these controversies and what do you believen?
-NO STUPID ANSWERS!!!!

2006-11-19 08:08:29 · 7 answers · asked by jsock 1 in Earth Sciences & Geology

**<1>**ultiple regression equation is y = -35,000 + 130a + 20,000b, where a is a person's age, b is the person's grade point average in college, and y is the person's income. income for a person 29 years old college grade point average 3.2.
A: 32700

***<2>***Suppose the r² value of your equation in #1 is .892. Interpret this number for our situation in #1

***<3>***This data shows the temperatures on randomly chosen days during a summer class and the number of absences on those days. (temperature, number of absences), (72, 3), (85, 7), (91, 10), (90, 10), (88, 8), (98, 15), (75, 4), (100, 16), (80, 5). Find the equation of the regression line for the given data.

***<4>***Interpret an r value of -0.82

***<5>***What number represents the sum of the x's for your data in #3?

***<6>****What number represents the sum of the x's squared (i.e., (sum of x)2 ) for your data in #3?

***<7>***What number represents the sum of the x-squareds (i.e., sum of x2 ) for your data in #

2006-11-19 08:08:26 · 1 answers · asked by 翊翔 金 1 in Mathematics

Science question, need help please! what is the major disadvantage of mitosis as a means of reproduction?

2006-11-19 08:03:12 · 5 answers · asked by watawatacrazy 3 in Biology

What would happen if you put a ripe tomato in glass of strong pure water?

2006-11-19 08:02:33 · 5 answers · asked by smells 2 in Biology

2006-11-19 07:59:44 · 5 answers · asked by DeeZee 2 in Geography

2006-11-19 07:59:26 · 3 answers · asked by ........ 3 in Zoology

I really need to know the purpose of a infrared spectrometer. Are they any other methods of getting similiar results. Did this open any doors as to finding something else? Please Help!

2006-11-19 07:56:27 · 2 answers · asked by turbo4045 1 in Chemistry

(g=9.80ms^-2)

2006-11-19 07:53:03 · 9 answers · asked by mapleafgal sweet an delicious 1 in Physics