Science & Mathematics - 7 August 2007

I'm confused about a certain step in a problem at this site:

http://purplemath.com/modules/distform.htm#to_quiz

If you follow the link, it's the very last example. How are they getting y^2? I don't understand.

2007-08-07 07:45:04 · 4 answers · asked by justgoingforadeathdrive 1 in Mathematics

2007-08-07 07:41:06 · 8 answers · asked by nate 2 in Geography

I have two questions i need help with

1.x2 + 2x - 15 = 0

a. Solve by factoring.
b. Solve using the quadratic formula.

2.x2 + 4x - 21 = 0

a. Solve by factoring.
b. Solve using the quadratic formula.

2007-08-07 07:40:14 · 10 answers · asked by Anonymous in Mathematics

In order to pass a physical education class at a university, a student must run 1 mile in 12minutes. After running for 10 min, she still has 500 yd to go. If her maximum acceleration is 0.15m/s^2 can she make it? If the answer is no, determine what acceleration she would have to have to be successful.

2007-08-07 07:35:01 · 3 answers · asked by vivianvo333 1 in Mathematics

The complement of an angle is 37 degrees. What is the measure of the angle?

2007-08-07 07:34:41 · 7 answers · asked by taylor17brown 1 in Mathematics

2007-08-07 07:21:05 · 6 answers · asked by Anonymous in Mathematics

2007-08-07 07:21:04 · 2 answers · asked by Anonymous in Mathematics

Sin^2x+(sin^2*cot^2x)=1

Thats all I have!!!

2007-08-07 07:20:05 · 4 answers · asked by babyruth45304 2 in Mathematics

Preferably in Chicago but it doesn't matter.

2007-08-07 07:18:26 · 3 answers · asked by Mr.Cooler 2 in Engineering

2007-08-07 07:17:20 · 7 answers · asked by chato r 1 in Astronomy & Space

Some say yes.

2007-08-07 07:12:04 · 9 answers · asked by noname 1 in Paranormal Phenomena

They said you can't do it....Can u???

2007-08-07 07:10:05 · 5 answers · asked by Anonymous in Mathematics

2007-08-07 07:09:34 · 14 answers · asked by Anonymous in Earth Sciences & Geology

when pressure is at 25 m bar and the temp is 25c

2007-08-07 07:03:58 · 3 answers · asked by rama k 1 in Physics

Describe to me what's happening in your head when I say:
2+5
5+7
8-3
6 times 7
4 divided by 7
Close your eyes if it helps.

2007-08-07 06:55:43 · 8 answers · asked by Anonymous in Mathematics

2007-08-07 06:46:02 · 7 answers · asked by sidney g 1 in Engineering

Find the domian
x squared+3x+2
------------------------ (fraction)
x squared - 10x +9

2007-08-07 06:42:45 · 4 answers · asked by Anonymous in Mathematics

When a radar detector goes off is it a sound wave that is being shot at it? Are radar and sonar waves able to interferring with each other? Does pitch have anything to do with radar?

2007-08-07 06:42:34 · 12 answers · asked by Joseph C 2 in Physics

I used excel to create a line graph or curve that has pressure on the x-axis and volumetric storage capacity on the y-axis. My problem is that currently my x-axis ends at a value of (or pressure) of35 and I now need to use this curve to find storage capacities at pressures ranging from 160 to 510. How would I go about finding an equation that would allow me to insert a given pressure and have it give me the storage capacity volume?

My points on the curve are: (0,0); (3,25); (4.5,41.5); (6,46); (8,600; (11.5,75.5); (14.75,85.75); (18,91.25); (21.7,101); (25.5,109.25), (29,115.5); (32,121); (35,124)

Also I do have access to a TI-89 calculator, but am not sure how to use it to do this.

2007-08-07 06:40:49 · 4 answers · asked by Brit 1 in Mathematics

explain?

2007-08-07 06:37:47 · 7 answers · asked by sara.girl122 1 in Physics

I know graphite is carbon, but any other differences? I read somthere that a carbon electrode uses less power. Is this true? In electrolysis, does one produce more H or O2 than the other or does one do it faster?

2007-08-07 06:34:12 · 1 answers · asked by Dan S 2 in Chemistry

Suppose humans were still around, how could they avert this disaster to survive?

2007-08-07 06:32:14 · 15 answers · asked by Athrun 2 in Astronomy & Space

2007-08-07 06:31:20 · 6 answers · asked by The Imaginer 2 in Astronomy & Space

please someone do tell me what is definite integral (cosx)^2dx with limits pi & 0.
this is a part of a bigger question.
i proceeded (1-(sinx)^2)dx
also integral cos x* cos x... the product rule...
yet i didn't get correct answer. please help me...
beleive me i tried it lots of times. so u wouln't be simply answering my HW but really helping me...

2007-08-07 06:29:35 · 5 answers · asked by Chandini 1 in Mathematics

I need a material that if fold then unfold will back 2 its original shape and that will not react with car fuel.

2007-08-07 06:22:09 · 5 answers · asked by pinkly b 1 in Engineering

1 light year away...how many years will it be in Earth time?

Can you reach the stars in 1 light year away?

2007-08-07 06:19:06 · 6 answers · asked by The Imaginer 2 in Astronomy & Space

doing science subjects at school.I want to know what should i do afterwards,how many years its gonna take me etc.Also what do you think of psychiatry as a profession?9 out of 10 people discourage me to opt for this.i don't know why?? i really want to know.What are the degrees which i would need to practice fully as a psychiatrist and what are the fields in which i can specializein psychiatry itself? Please help! thanks!

2007-08-07 06:18:12 · 9 answers · asked by miss brainy 2 in Medicine

??

2007-08-07 06:13:27 · 3 answers · asked by MEN D 1 in Biology

Why are all these cows being slaughtered when all thay have is a common cold that doesn't harm humans?

2007-08-07 06:12:33 · 9 answers · asked by willow 6 in Zoology

2007-08-07 06:06:27 · 1 answers · asked by k,b 1 in Chemistry