Science & Mathematics - 8 September 2007

2007-09-08 11:15:29 · 1 answers · asked by Anonymous in Zoology

Can someone please explain how to work this problem out and exactly why that is the answer? I did it, but im not sure if I am right and the data that I have does not make sense to me.

Show which is relatively better, and why: a score of 88 on the first test, or a score of 70 on the second test. Scores on the first test have a mean 80 and a standard deviation of 10. Scores on the second test have a mean 64 and a standard deviation of 6.

I did a little chart, but im not even sure if it is right. (I had to add the ex's cause the data came out weird without it. The chat might still not come out right on here for some reason.)

0 10 20 30 40 50 60 70 80 |90 100 110
xxxxxxxxxxxxxxxxxxxxxxxxx-----68----
xxxxxxxxxxxxxxxxxxxxx----------95----------
xxxxxxxxxxxxxxx ----------------99.7---------------


66 |72 78 64 70 76 82 88
xxxxxxx -----68----
xxxx----------95----------
---------------99.7--------------

2007-09-08 11:14:54 · 4 answers · asked by preteargraphic 1 in Mathematics

2007-09-08 11:13:06 · 3 answers · asked by candywhurl 1 in Chemistry

lose 100 million tons of material during the few months that its orbit brings it close to the sun. With an orbital period of 76 years, what is the maximum remaining life span of Halley's comet?

Help!! Please =)

2007-09-08 10:59:18 · 5 answers · asked by CrazyOne 1 in Astronomy & Space

Personally i like gravity. It has its ups and downs, but over all its been good to me. I don't mind that they made it a law, since i was obeying it anyhow. But, . . .as i under stand it, there are a rebellious few (and proud) that are against it.

Last i heard:
Nasa is contemplating designs for the mars lander that include the afore mentioned rebellion.

is it possible. - i think it is, but won't be quite what people think. I won't hold your breath or anyone else's waiting for a land speeder.

Livermore is conducting experiments in that direction. what exactly, i'm not sure since i don't work for either institution. Speaking of which. Such great break throughs are usually from outside the main stream.

(that's us)

Inside the box . . . people starting thinking inside the box. Good thing Plato's cave is big.

2007-09-08 10:58:44 · 3 answers · asked by Kelly 3 in Other - Science

I understand that the curve is a spiral, and that x^2+y^2=1. But what happens to x=t? if that becomes one, how?

2007-09-08 10:57:47 · 2 answers · asked by math q 2 in Mathematics

The equatorial system is very similar to the terrestrial coordinate system. Which terrestrial coordinate is the counterpart of right ascension? Which terrestrial coordinate is the counterpart of declination?

2007-09-08 10:57:23 · 2 answers · asked by New Mommy 1 in Astronomy & Space

2007-09-08 10:56:08 · 3 answers · asked by Anonymous in Medicine

Using IUPAC formalism name the structure where a cycloheptane bonds to cyclohexane... the structure looks like.....cycloheptane----cyclohexane "-----" = bond

hexylcycloheptane was what I thought, but that's wrong.

2007-09-08 10:54:46 · 3 answers · asked by <3 2 in Chemistry

2007-09-08 10:52:45 · 3 answers · asked by bubblepower789 2 in Geography

This is for Math so well, basically just list some items using both math and technology. They dont necessarily have to be used daily. Thank you! =)

2007-09-08 10:49:42 · 5 answers · asked by Anonymous in Other - Science

I am taking astronomy this semester and am finding it rather fascinating. I would like to know if anyone has any recommendations for a good telescope or binoculars (suitable for stargazing)...at a budget price. Thanks...

2007-09-08 10:46:07 · 3 answers · asked by higherlovetx 5 in Astronomy & Space

my car gets 7L per 100km what is that in Miles per gallon

2007-09-08 10:45:07 · 5 answers · asked by Anonymous in Mathematics

2007-09-08 10:42:47 · 19 answers · asked by Anonymous in Other - Science

exp=exponet
i need help

2.5731 x 10[exponet 2]
+
3.60 x 10 [exponet -1]
+
7.482 x 10 [exponet 1]
=

a) 3.68 x 10 [exp. 1]
b) 7.78 x 10 [exp. 1]
c) 1.37 x 10 [exp. 1]
d) 3.3249 x 10 [exp. 2]

2007-09-08 10:40:48 · 6 answers · asked by Erin 2 in Mathematics

solve for k: |k-4|=10

answer should be like this:

{a number here, another number here}

2007-09-08 10:38:45 · 16 answers · asked by Anonymous in Mathematics

X has coordinates (a , 3a), and Y has coordinates (-5a, 0) Find the coordinates of the midpoint of (XY).
Ok, so I know how to set up the equation so that it's

(a + -5a) /2 , (3a + 0)/2

How do I find out what a is? Do I just set them equal to each other or something because when I did that a ended up equaling zero. (probably did something wrong)
Could someone show me how you work it out?

Thanks

2007-09-08 10:37:10 · 5 answers · asked by Lilaznboi2011 2 in Mathematics

I can't figure that out. Please help me, thanks!!

2007-09-08 10:34:24 · 8 answers · asked by gamer31924 2 in Mathematics

2007-09-08 10:32:36 · 6 answers · asked by elger57 1 in Astronomy & Space

I have not taken math in over 30 years. My degree requires college algebra.I want to do as well as possible on placement math test. I do not expect to be able to take college algebra immediately, but would like to spend no more than 1 semester to prepare for it. Can anyone suggest on-line or other "refresher sites" to go to starting with the basics?

2007-09-08 10:32:23 · 4 answers · asked by In trouble 1 in Mathematics

2007-09-08 10:30:19 · 4 answers · asked by Shepard S 1 in Mathematics

I am pretty sure it is a solution, but I am not positive.

2007-09-08 10:28:53 · 6 answers · asked by Anonymous 3 in Chemistry

calculate (to 1 decimal accuracy) the perimeter of a regular octagon inscribed in a circle of radius 10cm

2007-09-08 10:24:36 · 6 answers · asked by Anonymous in Mathematics

what is the cause of lights flickering off for about 1,2, or 3 seconds and then kicks back on when lightning strikes? what role does lightning play in it?

2007-09-08 10:14:45 · 6 answers · asked by adamc44 3 in Weather

Which of these are correct IUPAC names:

3-isopropyloctane
3-ethyl-2-methyl-3-propylpentane
3-ethyl-2-methyloctane
2,2-dimethyl-4-pentanol
N-ethyl-2-pentanamine
methyl ethyl ether
2-isopropoxybutane
2-sec-butoxyisopropane
4-hexylcyclobutane
3,3,4-trichloro-2-hexanol

2007-09-08 10:07:46 · 1 answers · asked by bdgurl5388 1 in Chemistry

My teacher told our class that we had to design an experiment that involved seperating koolaid powder from the water in koolaid. What is the easiest way to seperate the two? I was thinking a coffee filter would work. My friend said she was going to try heating the mixture till the water evaporated. I think that would take a long time though. and would the powder burn? Please tell me your thoughts. thanks.

2007-09-08 10:06:10 · 5 answers · asked by me 2 in Other - Science

NaCI, Ag3N, Fe2O3.

This is my AS level Chemistry homework, I'm struggling to calculate the atoms, can someone please help, thanks.

2007-09-08 10:03:44 · 4 answers · asked by Anonymous in Chemistry

Let M and N be two 9-digit positive integers with the
property that if any one digit of M is replaced by the digit
of N in the corresponding place (e.g., the `tens' digit of M
replaced by the `tens' digit of N) then the resulting integer is
a multiple of 7.
Prove that any number obtained by replacing a digit of N by
the corresponding digit of M is also a multiple of 7.
Find an integer d > 9 such that the above result concerning
divisibility by 7 remains true when M and N are two d-digit
positive integers.

2007-09-08 10:00:12 · 3 answers · asked by Mugen is Strong 7 in Mathematics

SATP stands for standard ambient temperature and pressure

2007-09-08 09:59:37 · 1 answers · asked by Shani D 2 in Chemistry

chemistry homework. answers greatly appreciated.

2007-09-08 09:59:04 · 4 answers · asked by Anonymous in Chemistry