Science & Mathematics - 26 September 2007

2007-09-26 16:37:15 · 1 answers · asked by Sammy G 1 in Chemistry

a)The first 6 terms in row 25 of Pascal’s triangle are 1, 25 , 300 , 2300 , 12650 , and 53130. Determine the first 6 terms in row 26.

How would i answer this question please help!!!
Thank you

2007-09-26 16:32:16 · 5 answers · asked by Anonymous in Mathematics

2007-09-26 16:32:09 · 3 answers · asked by Black Light Burns 1 in Chemistry

3(x+5)
---------- = 2x-2
5

2007-09-26 16:30:43 · 9 answers · asked by Abiku 6 in Mathematics

If anyone can help me out, it'd be REALLY helpful!

thanks!

2007-09-26 16:29:13 · 3 answers · asked by gatorbabe09 2 in Physics

2007-09-26 16:28:34 · 10 answers · asked by . : : stephanie : : . 4 in Mathematics

2007-09-26 16:27:58 · 3 answers · asked by lover2 1 in Chemistry

For school we have to think of things with high density i have thot of a few but what do u think of?
Like led, granite?

2007-09-26 16:26:45 · 3 answers · asked by Anonymous in Chemistry

A commerical freight carrier is flying at a constant speed of 400 mi/h and is traveling 4 mi east for every 3 mi north. A private plane is observed to be 210mi due east of the commerical carrier,traveling 12 mi north for every 5 mi west.If it is known that they are on a collision course,how fast is the private plane flying?

Ok so when i tried the problem out..., the freight has a slope of 4/3;The private plane 12/-5;The freight is traveling at 400mi/h; and the we need to know the plane; so maybe i try putting y=mx+b for both making them equal to find the speed? I got lost trying to find speed.Help?

2007-09-26 16:25:44 · 1 answers · asked by Krumpits&Tea☺ 2 in Mathematics

I had my house fully fumigated October 2006, meaning it was covered the whole house entirely, and fumigated for sub and med. termites (two different kinds).
Now, since last week I have found 4 living termites flying around, and none since the whole year. I am upset.
Could it be they did not do a good job the company, or are they coming from the neighbor next door?
She rents, but I do not want to ask her, and if she does have termites from her home coming to mine, could I sue or what action can I take against her property management company? Or do I have to call my company up again?

2007-09-26 16:25:16 · 4 answers · asked by Born Valentine's Day 5 in Agriculture

The atomic mass of element X is 33.42 amu. A 28.09 g sample of X combines with 85.30 g of another element Y to form a compound XY. Calculate the atomic mass of Y.

2007-09-26 16:24:51 · 2 answers · asked by Anonymous in Chemistry

2007-09-26 16:22:49 · 3 answers · asked by king T 1 in Biology

why is the rule of divisibility of 7 not in math textbooks

2007-09-26 16:22:44 · 3 answers · asked by suzy 1 in Mathematics

Explain the following statement: Every mineral is a element or a compound.
_______________________________________________
I don't quite get that please help me =[

2007-09-26 16:22:19 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-26 16:18:19 · 15 answers · asked by francesca h 2 in Astronomy & Space

2007-09-26 16:16:24 · 2 answers · asked by chaniquana 1 in Chemistry

A company is decreasing the amount of tuna sold in a cylindrical can by 10%. The cans will have the same height but a smaller diameter. By what percent should the diameter decrease in order to accomodate the change?

2007-09-26 16:12:12 · 2 answers · asked by Anonymous in Mathematics

2007-09-26 16:10:19 · 8 answers · asked by Anonymous in Zoology

2007-09-26 16:09:28 · 1 answers · asked by greatestfan84 1 in Mathematics

Does the size of the molecule have anything to do with what moves across the cell membrane and what doesn’t?

What other factors impact movement of molecules?

Thanks in advance. Appreciate it.

2007-09-26 16:08:53 · 3 answers · asked by Anonymous 2 in Biology

2007-09-26 16:07:56 · 2 answers · asked by Vicky 2 in Mathematics

2007-09-26 16:06:14 · 4 answers · asked by Jamie 4 in Earth Sciences & Geology

I swear im not just fishing for answers lol i just need some help and my book is not doing the trick..

"what is the weight of a 76kg astronaut on (a)Earth, (b) on the moon (g = 1.7m/s2) and, (c) on mars (g= 3.7m/s2) and (d) in outer space traveling with constant velocity?"

i know that F=mg in this case, and i understand the difference between weight and mass.. I guess im just having trouble understanding... do i use 9.8m/s2 for g when im calculating for earth? cause then i get a really high (unrealistic) weight. and wouldnt weight and mass be the same on earth anyway? lol now im just thinking too much.. ANY help please :)

2007-09-26 16:01:50 · 6 answers · asked by Anonymous in Physics

A ball held by a string is coasting around in a large horizontal circle. The string is then pulled in so the ball coasts in a smaller circle. When it is coasting in the smaller circle its speed is:

a) greater
b) less
c) unchanged

Yes - I know it's not a difficult question but it allows for a great discussion of the mechanics involved and relates to the last question nicely.

2007-09-26 16:00:54 · 3 answers · asked by ? 6 in Physics

I'm thinking a 10' octagonal deck or garden gazebo. At first I was sure it was point to point. Then I started doubting myself. Help, please?

2007-09-26 15:54:21 · 3 answers · asked by Emmaean 5 in Engineering

Solve for x
x/2 & x/5 are fractions

2007-09-26 15:53:45 · 11 answers · asked by Abiku 6 in Mathematics

Here's a nice little problem distantly related to some work I did way back when for my honours thesis.

In ring theory, an idempotent element is one which is its own square. In a ring with unity, 0 and 1 are always idempotents, but there may or may not be other idempotent elements.

Now the product of idempotents is not necessarily an idempotent. In my honours thesis I was concerned with characterising the elements that could be expressed as the product of idempotents. Here's a little problem relating this to the simple ring Z_n (n any integer ≥ 2).

a) Prove that in Z_n, the product of two idempotents is also an idempotent.

b) If n = p^r where p is prime, show that the only idempotents of Z_n are 0 and 1.

c) If n = pq where p and q are distinct primes, show that Z_n has exactly four idempotents and characterise them.

d) For arbitrary n ≥ 2, characterise the number of idempotents in Z_n in terms of the prime power factorisation of n.

2007-09-26 15:53:24 · 2 answers · asked by Scarlet Manuka 7 in Mathematics

The following sets of three numbers each form a word. Put the words together to find a question, and then submit the answer to that question:

(1,4,45) (2,7,5) (6,1,11) (24,3,47) (16,1,6) (13,9,5) (94,3,27) (258,2,41)?

What is the answer?

Hint: The first word is "What".

2007-09-26 15:51:15 · 6 answers · asked by Andrea B 1 in Mathematics

I have tried really hard but can't figure these problems out:

1) A coin bank contains 30 coins, all dimes and quarters, worth $5.70. Write a system of linear equations to represent this situation. How many dimes and how many quarters are in the bank?

2) You have $25 to spend on picking 21 pounds of 3 different types of apples in an orchard. The empire apples cost $1.40 per pound, the red delicious apples cost $1.10 per pound, and the golden delicious cost $1.30 per pound. You want twice as many red delicious apples as the other two types combined. How many pounds of each type of apple should you buy?

3) solve for a: S= a(1-r^n)
--------------- (divided by)
1-r

If you could help I would appreciate it sooo much!!!

2007-09-26 15:50:07 · 3 answers · asked by chocolatelover2292 2 in Mathematics

...or what other superhuman abilities would you like to have?
why?

2007-09-26 15:49:59 · 6 answers · asked by phoenixxgrey 3 in Zoology