Science & Mathematics - 30 August 2007

2007-08-30 14:21:29 · 3 answers · asked by wmeckes10 1 in Mathematics

any interesting facts?

2007-08-30 14:19:49 · 10 answers · asked by e s 2 in Earth Sciences & Geology

2007-08-30 14:18:23 · 13 answers · asked by Anonymous in Zoology

1) Use both inquality and interval notation to describe the set of numbers.

Salary raises at the State University of California at Chico will average between 2% and 6.5%.


2) Rewrite the expression without using absolute value symbols.

| (square root)5 - 5/2 |


3) Replace O with <,=,> to make the statement true.

-|-5| O |-5|

These are the problems I'm really stuck on. Please help! Will give best answer.

2007-08-30 14:13:56 · 1 answers · asked by charmedrules10 2 in Mathematics

can you please explain how to factor problems like this:

10x^2 - 7x - 6 = 0

i don't understand the ones with a number in front of the x squared.

2007-08-30 14:12:59 · 10 answers · asked by Anonymous in Mathematics

2007-08-30 14:11:28 · 3 answers · asked by janice v 1 in Chemistry

how do you factor a problem that is like this:

81p^4 - 18p^2 + 1 = 0


please explain

thank you

2007-08-30 14:10:20 · 6 answers · asked by Anonymous in Mathematics

trouble on it

2007-08-30 14:07:14 · 5 answers · asked by lari b 1 in Mathematics

2007-08-30 14:06:24 · 5 answers · asked by lala haha gaga mama 2 in Mathematics

2007-08-30 14:06:01 · 3 answers · asked by Anonymous in Weather

2007-08-30 14:04:40 · 5 answers · asked by canhgachiennuocmam1991 1 in Astronomy & Space

Why are we not sending a human mission to Mars?


Also, why have we not sent an astronaut to live on the Moon? There are large hydrogen deposits, which are most likely frozen water on the moon. So an adequate supply of water is not the problem.

I'm only a high school freshmen, therefore I'm not as knowledgeable as someone on Yahoo Answers is, at least I'm hoping. Am I missing something obvious, prohibiting us from exploring further in the Solar System?

2007-08-30 14:04:11 · 10 answers · asked by Mike the Venerable 2 in Astronomy & Space

What is the instantaneous speed (in m/s) at the 10-second mark for a car that accelerates at 2 m/s squared from a position of rest? I need the answer, but I need a very very very easy to understand explanation for how you got the answer. Thank you.

2007-08-30 14:03:53 · 2 answers · asked by Anonymous in Physics

in a filament lamp circuit as the voltage reached a certain high level and the circuit behaved not according to ohm's law. Can you give me a reason why?

2007-08-30 14:02:54 · 5 answers · asked by Anonymous in Physics

2007-08-30 14:00:07 · 3 answers · asked by rujem shae 1 in Weather

if a problem reads

A professional baseball player believes that he is a good hitter, but his current batting average is only .250. That is he has only gotten hits in 25% of his at-bats. Find the probability that the player who really is a .250 hitter will get at least 18 hits in his next 50 at-bats

Now,
n=50
x=18
Probability of success or failure=.50

Do I include de .250 somewhere? or not?

2007-08-30 13:56:26 · 2 answers · asked by ABC 4 in Mathematics

Write equations of two lines that satisfy each description.
a. perpendicular and one is vertical
b. paralled and neither has a y intercept.

2007-08-30 13:54:29 · 3 answers · asked by Ballerina 5 in Mathematics

can you please help me!!!??

2007-08-30 13:51:13 · 6 answers · asked by gyrl89 1 in Mathematics

The limit as t approaches 2 of:
(t^3 + 3t^2 -12t +4)/(t^3-4t)

When I plug in 2 I get 0 over 0. I know this needs to be factored. If it helps, I know the answer is 3/2.

2007-08-30 13:48:43 · 3 answers · asked by Anonymous in Mathematics

2007-08-30 13:46:22 · 8 answers · asked by Anonymous in Astronomy & Space

Please help! I am awful at science...thanks

2007-08-30 13:45:52 · 6 answers · asked by lola 1 in Astronomy & Space

-5+(-4) and tell me how you get the answer as i'm not understanding this math
thank you

2007-08-30 13:45:51 · 8 answers · asked by Anonymous in Mathematics

i see lots of people going down the rainbow river in thunder and lightning storms. I know they should get off the river, but they don't. So I would really like to know what would happen if lightning struke near them.

2007-08-30 13:43:29 · 7 answers · asked by Anonymous in Physics

And what is the distance (in km) that he runs if he maintains this average speed for 1 hour? I need the answer, but I also need a very very easy to understand explanation for the answer. Thank you.

2007-08-30 13:38:39 · 2 answers · asked by Anonymous in Physics

need help in this question...
intergrate by parts not by substitution..
thankyou

2007-08-30 13:33:12 · 1 answers · asked by Anonymous in Mathematics

I am doing some physics work and I am confused about a certain question. It is as follows:

The dot product of two vectors
1. is a scalar
2. is 0 if the two vectors are perpendicular
3. lies perpendicular to the plane defined by the two vectors

and I have to state which statements are true. It can be 1 only, 2 only, 3 only, 1 and 2 only, or all three.

As of right now I am pretty sure that 1 and 2 are true, but I am not sure about 3. Can anyone tell me which ones are true, and if possible, explain to my why? (i am just beginning my physics studies and I find it difficult. By the way does anyone know any good websites or books that can break down this sort of thing as my textbook is kind of advanced.)

2007-08-30 13:30:48 · 1 answers · asked by Mark the man 2 in Physics

2007-08-30 13:27:40 · 2 answers · asked by ~~xx{Stelth[k9]}xx~~ 1 in Geography

1.) John and Mary Smith plan to put a wooden
fence around their yard in order to keep the
mean cats away from their dog Fido. There
is a gate that is 2.45 m long which is not
included as part of the length of the fence.
What total length of fence is required to
enclose a rectangular yard whose sides are
28.4 m and 34.4 m in length? 1 m = 3.281 ft .
Answer in units of ft.

(please show work - thank you very much)

2.
A billionaire offers to give you $4.9 billion if
you will count out the amount in $1 bills or
a lump sum of $4000. Assume that you can
count at an average rate of one bill per second,
and be sure to allow for the fact that you need
about 10 hours a day for sleeping and eating.
Which offer should you accept?
In order to answer this, how long will it take
you to count out the $4.9 billion? Answer in
units of years.

2007-08-30 13:26:55 · 6 answers · asked by mimi j 1 in Physics

▬▬▬▬▬▬▬▬▬▬
1 ►The universe’s symmetry isn’t spherical, but the universe would be like spinning sphere? If it is so, where is the reference frame for the rotation?

2 ►This symmetry can explain where would be the antimatter? Matter and antimatter would be towards the poles, and there would be an equator empty?

3 ►It is possible that the plane rotation for the E.W. would be related to asymmetric molecules in the space? The panspermia hypothesis [Fred Hoyle] suggest an Universe filled with bacteria (as cosmic dust). This kind of dust can rotate the polarized waves, yes?
▬▬▬▬▬▬▬▬▬
Please search for 'polarized universe' in the web...

2007-08-30 13:22:34 · 2 answers · asked by Anonymous in Astronomy & Space

Phoenix fabrics had five odd pieces of fabric that it put on sale for $120. The pieces measure 1 3/4, 2 1/8 yard, 3 3/8 yard, and 2 1/4 yard. What was the average selling price per yard?

2007-08-30 13:21:08 · 8 answers · asked by Anonymous in Mathematics