Science & Mathematics - 25 August 2007

2007-08-25 07:08:27 · 6 answers · asked by Anonymous in Zoology

x + 9y = 90

- x + 3y = 18

2007-08-25 07:07:07 · 8 answers · asked by Jack M 1 in Mathematics

The perimeter of a rectangle is 122 m. The length is 10m more than twice the width. What are the dimensions?

2007-08-25 07:05:20 · 4 answers · asked by Jack M 1 in Mathematics

Okay, so now I can solve equations with variables on both sides easily. But now I don't know how to use the distributing property. =/ Once again, please be so kind to dumb little nut gobbler to explain step by step when solving. Thanks

2007-08-25 07:04:25 · 6 answers · asked by Anonymous in Mathematics

5x + 9y = -17

-4x + y = 30

2007-08-25 07:03:59 · 7 answers · asked by Jack M 1 in Mathematics

2007-08-25 07:00:09 · 2 answers · asked by Anonymous in Mathematics

Can someone tell me the details of number which are used in IC's.Why are these numbers used.
Eg. Opamp 741,.

2007-08-25 06:58:22 · 2 answers · asked by Khwaja 2 in Engineering

Many homes in rural America are heated by a propane gas, a compound that contains only carbon and hydrogen. Complete combustion of a sample of propane produced 2.641g of carbon dioxide and 1.442g of water as the only products. Find the empirical formula of propane.

2007-08-25 06:54:41 · 2 answers · asked by Andrea 2 in Chemistry

I need help understanding and figuring out which digits are considered significant numbers/zeros. Any websites or actual explainations will GREATLY be appreciated!

2007-08-25 06:54:19 · 3 answers · asked by Harley Q. 2 in Chemistry

e.g. what are the factors of eqauation x^3-6x^2+11x-6=0
Expalin the procedure.

2007-08-25 06:51:50 · 6 answers · asked by Sahil R 1 in Mathematics

2007-08-25 06:48:39 · 1 answers · asked by Genetikçi 2 in Biology

6m + n = 31

m - 3n = 21

2007-08-25 06:47:15 · 6 answers · asked by Anonymous in Mathematics

3x - 3y = - 9

6x + 48 = y

2007-08-25 06:45:52 · 7 answers · asked by Anonymous in Mathematics

I know its around 168W longitude, and it's somewhere in Alaska, but I need to know the exact longitude of the most westerly boundary of the U.S.

2007-08-25 06:45:44 · 4 answers · asked by JiaySun 2 in Geography

Radio Shack?
Circuit board types, is there only one kind?
What Do I need to learn about Transitors Resistors, compasitors ect ect...?
What I need to know if I want to be serious about engineering electronics, or simply to modify an electronic component?

Thanks.

2007-08-25 06:44:14 · 2 answers · asked by Anonymous in Engineering

1.The slope of line AB is -3/10. What is the slope of line CD, if CD is perpendicular to AB?

2. The slope of line AB is 4. What is the slope of line CD, if CD is perpendicular to AB?

3. The slope of line AB is -5. What is the slope of line CD, if CD is parallel to AB?

4.The slope of line AB is -7. What is the slope of line CD, if CD is parallel to AB?

5. The slope of line AB is -1 3/4. What is the slope of line CD, if CD is perpendicular to AB?

6. The slope of line AB is -1/3. What is the slope of line CD, if CD is parallel to AB?

7. The slope of line AB is 1 ¼. What is the slope of line CD, if CD is perpendicular to AB?

8. The slope of line AB is 3. What is the slope of line CD, if CD is parallel to AB?

2007-08-25 06:43:56 · 3 answers · asked by Smith 1 in Mathematics

a CD costs $10 each. If you buy 4 CD's, you get 1 CD free. Write a equation that represents the cost as the function of number of CD's.

2007-08-25 06:42:42 · 2 answers · asked by Ha!! 2 in Mathematics

Now Imagine theres a point 'A' vertically above the surface of earth. the distance of point A from the horizontal plane is given by X metres .also, imagine theres no atmosphere.

Now Imagine from within that point A , a chain {made of identical oval shaped rings linked sequentially} keeps on appearing {materializing}

and it starts to fall down due to gravity and hits the ground.the liks which appear from within point A are static and are pulled down by the links below them i.e., the faster you pull the faster the new links materialize. now what will be the velocity of the chain { particularly the rings} when they hit the ground if X = 20 metres .(remember the chain keeps on materializing from the point A}.

i think the terminalvelocity of the chain can be given by Vt = squarerootof (Xg)

where g = acceleration due to gravity(take g= 10 m/s^2).
now sqrroot of(20*10) = 14.14.so , here Vt = 14.14.

2007-08-25 06:40:49 · 3 answers · asked by balaji.k 2 in Physics

2007-08-25 06:35:57 · 5 answers · asked by dibman2001 1 in Chemistry

Write the equation of the line passing through (7,1), (7,-4) and (7, 4)

2007-08-25 06:31:29 · 8 answers · asked by Anonymous in Mathematics

Theres a rumor floating around, first heard of it on facebook.com. heres the link, it will only work if u are a member of facebook. http://www.facebook.com/event.php?eid=10914723440

2007-08-25 06:26:35 · 8 answers · asked by Anonymous in Astronomy & Space

2007-08-25 06:18:57 · 4 answers · asked by suzywong 4 in Zoology

2007-08-25 06:16:01 · 13 answers · asked by Anonymous in Physics

2007-08-25 06:13:17 · 5 answers · asked by bbygotriceee 2 in Geography

Hi, I'm completely lost when it comes to algebra. Please, explain step by step how you solved the equation. And any suggestions of websites that help you understand algebra clearly. Please don't suggest quickmath.com, it just solves the answers but it doesn't help at all.
Thanks,

2007-08-25 06:11:36 · 12 answers · asked by Anonymous in Mathematics

Look at the graph above and comment on the sign of D or the discriminant. Form the quadratic equation based on the information provided and find its solution.

The equation is

y = ax^2 + bx + c

One approach: Put each (x, y) pair that you have in to get three equations. Then solve them to find a, b, and c.

A different approach: If (s,0) and (t,0) are where the parabola crosses the x-axis, then the equation is y = a(x - s)(x - t)
To find a, put that vertex you are given in to find the equation.

2007-08-25 06:10:55 · 2 answers · asked by Anonymous in Mathematics

to lake water after a thunderstorm the day before (is it cold?,warm?dirty?) i might og swimming today but i want ot make sure the water is ok

2007-08-25 06:06:17 · 3 answers · asked by Bryan 1 in Weather

2007-08-25 06:06:09 · 9 answers · asked by codee 1 in Chemistry

When you try to stretch a piece of plastic bag,the length of the piece being pulled increases dramatically and thickness decreases.Does the same thing happen when you pull a piece of paper? Why or why not? Explain on a molecular level

2007-08-25 06:03:51 · 1 answers · asked by Bisma 2 in Chemistry

2007-08-25 06:03:42 · 4 answers · asked by Anonymous in Mathematics