Science & Mathematics - 15 September 2007

a) Combinations
There are 12 candidates for 4 positions

C(m,n)= __M !_______
(m - n)! n!

b) Permutations
There is 52 cards. How many hands you can deal taken five in each hand?

P(m,n)= ___m !________
(m - n)!

2007-09-15 14:22:43 · 2 answers · asked by Jesnes 1 in Mathematics

The problem is:

A part of $5,000 was invested at 7% annual interest and the remaining at 8% annual interest. At the end of the year, the total amount received was $5398. How much money was invested at each rate?

....I know the procedure on how to do this problem, but i just need someone to validate me with my answer. Here is my work:

*Amount invested at 7% = X
*Amount invested at 8% = (5,000-X)

So, Investment= Rate X Amount = Interest

*7% investment= 0.07 rate (X) = 0.07
*% investment = 0.08 rate (5,000-X) = 0.08(5,000-X)
*Total investment = 0.07(X) + 0.08(5,000-X) = 5,398
So,: 0.07x + 400 - 0.08x = 5,398
(0.07-0.08)x = 5,398-400
(-0.01x/-0.01) = (4,998/-0.01)
(x = -498,800 @ 7%)

.....Is my answer correct? If not, would you please be so kind to tell me where my mistake is?

2007-09-15 14:21:01 · 3 answers · asked by dana c 1 in Mathematics

Which one of the following can be done to shorten the half-life of the radioactive decay of uranium-238?

A. none of the above
B. freeze it
C. convert it to UF6
D. heat it
E. react it with an oxidizing agent


and how do u kno?

2007-09-15 14:18:54 · 2 answers · asked by desigoddess217 1 in Chemistry

A circle has a circumference of 100 yards. Find its area.
Use 3.14 inplace of pi.

Please show work to find the area.
The answer i got was 795.8 but in the back of the book they had got 796.2. I want to know how to do this so i can understand it on a test.
Thank-you for your time!

2007-09-15 14:17:33 · 5 answers · asked by donutss 1 in Mathematics

I have no idea what this means....

5. Using the discriminant, determine the nature of the roots of the following equations (DO NOT SOLVE):

a) x2 + 4x – 1 = 0

b) 2n2 – 3n + 5 = 0


6. Find the roots using the quadratic formula.
a) 3x2 – 2x + 5 = 0

b) 2t2 + 6t – 3 = 0



THANKS EVERYBODY!!!

2007-09-15 14:15:43 · 12 answers · asked by crackr 3 in Mathematics

You know how they said that we evolved form apes and stuff,and noahs ark?And that a giant meteorid crashed into the planet and killed off all the dinosaurs?What I think is that..ok,the dinosaurs could have lived at the same time as dinosaurs,and the humans had no idea of it,and,(God did not exist around this time)Then a meteroid crashed into the planet wiping out all humans and dinosaurs,and at the same time,creating lakes and rivers all around the world.Then they could have filled up with water after the flood as mentioned in Noahs Ark,filling the big holes in the ground with water(that the meteorids created)And then all the dinosaurs and humans drowned.Then God shows up and creates more humans.Then the continent(known as Pangea back then millions of years ago or so) splits up into what we now call like North America,Russia,Europe,Africa,Australia,and so on.

2007-09-15 14:13:14 · 12 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-15 14:12:22 · 2 answers · asked by Seena P 1 in Chemistry

Which type of radioactive decay results in no change in mass number and atomic number for the starting nucleus?

A. gamma
B. alpha
C. positron emission
D. electron capture
E. electron emission

2007-09-15 14:11:15 · 2 answers · asked by desigoddess217 1 in Chemistry

s is the lengh of the arc (m) , r is the radius (m) et θ is the angle in radian how to demonstrate this formula??? thanks a lot

2007-09-15 14:11:03 · 4 answers · asked by Anonymous in Physics

You stand on a chair and jump off
The Earth is lurching up toward you with acceleration a.
If your mass is 96 kg, what is value of a?
If the seat of chair is 30 cm off ground, how far does Earth move while you are falling?

2007-09-15 14:08:36 · 4 answers · asked by ひいらぎ 5 in Physics

2007-09-15 14:06:15 · 18 answers · asked by Carldric G 1 in Geography

My doctor said I cannot eat nuts because the little nut particles will get stuck in my colon, or something like that. I forgot what the name of it was.

Thanks!

2007-09-15 14:06:09 · 15 answers · asked by frogster99 2 in Medicine

A) Dirty Air
B) Clean Air
C) Pencil
D) Ice
E) Iron
F) Silver Chloride
G) Salt Water
H) Ethanol

2007-09-15 14:05:32 · 2 answers · asked by Anonymous in Chemistry

Which one of the following processes results in an increase in the atomic number?

A. emission
B. corrosion
C. electron emission
D. positron emission
E. emission

2007-09-15 14:01:18 · 1 answers · asked by Anonymous in Chemistry

please help in any way you can.

2007-09-15 14:00:44 · 2 answers · asked by Elvis P 1 in Chemistry

How does

( 11(pie)/6) = ((square root 3)/2, 1/2)?

please tell me how you got this answer

2007-09-15 13:58:38 · 6 answers · asked by alfomale 1 in Mathematics

Please put the contents, indications, dosage, contraindications, special precautions, adverse reactions, drug interactions, presentation and packing and classification of each drugs...

2007-09-15 13:58:21 · 4 answers · asked by drew_line 1 in Medicine

I am a geology major. I transfered to Univeristy Alaska Fairbanks from Murray State University in KY. MSU only required up to Calculus and two semesters of any given science other than geology. UAF required two semesters of Physics, two of Chemistry and all the way up to Calculus 2. I have heard that all of this is useless because in the field, everything is on computer and you really do not even use the other sciences that much, aside from reference. I would like to know how true this is. I am struggeling in the physics class and my math class. I am worried that I will not be able to cut it as a geologist if I have to used calculus in everyday work and know all these physics formulas even though the geology classes are so easy for me.

Thanks for your responses!

2007-09-15 13:58:05 · 2 answers · asked by Doodlebug 4 in Earth Sciences & Geology

What household products have either silicon, arsenic, or germanium in them please??

Thank you :)

2007-09-15 13:57:33 · 3 answers · asked by Anonymous in Chemistry

Would precipitation occur when 500ml of a 0.02M solution of AgNO3 is mixed with 500ml of 0.001 M solution of NaCl if the Ksp of AgCl = 1.8x10^-10 ?

2007-09-15 13:49:40 · 1 answers · asked by Ben F 1 in Chemistry

For the positive ions in the list, predict the formula of the simplest compound formed between each positive ion and the oxide ion.
ex: Fe3+

2007-09-15 13:49:14 · 1 answers · asked by monie20032007 2 in Chemistry

2007-09-15 13:47:44 · 8 answers · asked by mztana820 1 in Mathematics

Dramamine (dimenhydrinate, motion sickness pills), robaxin (methocarbamol), and klonopin (clonazepam)? 16, 3, and 4 of each. Don't ******* ask why. If you tell me not to do drugs, they're bad for me, or anything like that, I will hate you with a burning passion for all of eternity.

These pills won't interact and kill me will they? I ate the three muscle relaxers (robaxin) about 2 or 3 hours ago. I snorted, dissolved, chewed, swallowed the K's about an hour ago. I'm having a really ******* bad day and I need to leave this world for awhile. The drugs I already took aren't doing enough. Will the dramamine OD me or anything? I've done 20 dramamines at a time once, that's not what I'm worried about. I'm worried about the drugs interacting and ******* me up.

2007-09-15 13:47:00 · 3 answers · asked by huhididnthearyou 1 in Medicine

A glacier advances at 7x10^-6 cm/s. How far will it move in 3.8 years? Answer in units of cm.

2007-09-15 13:44:09 · 4 answers · asked by Anonymous in Mathematics

It seems so simple! But my Calc professor lectures quite the opposite that my Pre-Calc professor did. Any help would be greatly appreciated!

2007-09-15 13:42:01 · 3 answers · asked by Anonymous in Mathematics

1.What is acid
2. List 2 different ways in which acid rain can harm the plants and animals in streams and lakes
3.Are there some countries which are more affected by acid rain?
4.Find out some ways that damage caused by acid rain could be stopped or at least reduced
Don't make your answers too detailed and make sure I can still understand them, thanks!

2007-09-15 13:41:24 · 3 answers · asked by Sara F 1 in Weather

2007-09-15 13:41:08 · 6 answers · asked by ken E 1 in Astronomy & Space

2007-09-15 13:40:32 · 4 answers · asked by Hitman44 1 in Chemistry

When I mention Physics to someone in the US they said "yea..it's good to excersize" (Physics = phys ed). The average American has no conception about anything deeper than belching.

2007-09-15 13:38:55 · 2 answers · asked by Anonymous in Physics

Mg reacts with N forming an Ionic compound with a sample of 4.8 x 10 to the 22nd Mg ions. How many nitride ions are in the compound?


I said 2.4 x 10 to the 22nd because there would be half as many?

2007-09-15 13:37:22 · 1 answers · asked by mikala m 2 in Chemistry