Science & Mathematics - 5 December 2007

2007-12-05 03:42:56 · 10 answers · asked by Hoshedar Daboo 2 in Other - Alternative

2007-12-05 03:42:35 · 9 answers · asked by clozepin 1 in Zoology

Hi guys,
You see, I've got that equation that I can't solve, because I have to write it like that : a√b+c
This the equation: 2√50+6√5-√75
=10√2+6√5-5√3
Now, I really really need to have this written like the modal shown previously !
Thanks by advance

2007-12-05 03:41:54 · 5 answers · asked by Anonymous in Mathematics

A 55ml sample of a 7.50M KOH is diluted by adding 175ml of water. Calculate the new concentration of the KOH solution.

2007-12-05 03:40:49 · 2 answers · asked by Anonymous in Chemistry

I didn't know how to type out an integral symbol so here goes

http://i3.tinypic.com/6z3unid.jpg

2007-12-05 03:39:08 · 2 answers · asked by paintedladyinthecityoflies 1 in Mathematics

I need help in figuring out the answers to these two questions.

1. A vertical circular cuylinder has radius r feet and height h feet. If the height and radius both increase at the constant rate of 2ft/sec, then the rate, in square feet per second, at which the lateral surface area increases is: Answer Choices: A.4(pie)r B.2pie(r+h) C. 4pie(r + h) D. 4(pie)(r)(h) E. 4(Pie)(h)


2.Two cars are traveling along perpendicular roads, car A at 40 mi/hr and car B at 60 mi/hr. At noon when car A reaches the intersection, car B is 90 mi away, and moving toward at it. At 1 P.M. the distance between cars is changing, in miles per hour, at the rate of: Answer Choices: A. -40 B. 68 C.4 D.-4 E. 40


Thank you so much in reading this and helping me out! Its greatly appreciated!!


:Erin

2007-12-05 03:36:06 · 2 answers · asked by Anonymous in Mathematics

Ok I have to factor these some how n they are difference of cubes problems, I have not the slightest clue on what to do ... When I see these problems I go blank, I'm Having a test on a bunch of difference of cubes problems so pleas explain to me what the hell to do ...


Sum of Cubes Pattern
a3 + b3 = (a + b)(a2 - ab + b2)
Difference of Cubes Pattern
a3 - b3 = (a - b)(a2 + ab + b2)


1. 64x^3 + 1
2. 1-125b^3
3. 8x^3y^6 + 27
4. a^3 b^6 – b^3
5. 27x^3 – 8y^3

The most I know is you have to find the GCF first.....
Thanks........

2007-12-05 03:33:24 · 5 answers · asked by Anonymous in Mathematics

2007-12-05 03:29:48 · 11 answers · asked by Anonymous in Physics

2007-12-05 03:28:22 · 4 answers · asked by Alexander 6 in Physics

are 4 Newton to the right and 6 Newton to the left respectively.

What is electrostatic force acting on charge Q2?

2007-12-05 03:22:34 · 2 answers · asked by Alexander 6 in Physics

A boy buys some packets of sweets for £1.20. If the sweets had been 3p a packet cheaper, he would have recieved 2 more packets for his money. How many packets did he buy?

2007-12-05 03:20:46 · 4 answers · asked by Cookz 1 in Mathematics

2007-12-05 03:19:21 · 6 answers · asked by Ash F 1 in Chemistry

I need to make up 2.5L of a 1.25M solution of NaCl for next lab. How many moles of NaCl do I need? and how many grams of NaCl do I need?

2007-12-05 03:18:47 · 2 answers · asked by cdf0 1 in Chemistry

stearic acid
potassium iodine
carbonyl diamide
magnesium oxide
sodium chloride
sucrose
calcium chloride
citric acid

or could you tell me how to figure out if they are covalent or ionic using their melting time or conductivity in water or conductivity in ethanol

2007-12-05 03:17:11 · 1 answers · asked by peace 3 in Chemistry

What does the gene normally do? And what are some characteristics of cancer cells?

2007-12-05 03:15:50 · 2 answers · asked by Chelsea R 1 in Biology

Does the length of a gun's barrel affect a shot bullet's speed? I think the barrel length affects accuracy. What else does it affect?

2007-12-05 03:15:47 · 16 answers · asked by msc44 2 in Engineering

Jo is practising pool on an American 9-ball pool table, where the balls are numbered from 1 to 9. Jo picks a geometric sequence and, if there are balls on the table whose numbers are in that sequence, then Jo pots all of them. Jo keeps picking geometric sequences (and potting the corresponding balls) until all nine balls have been potted.

If Jo is very good, and never misses a shot, what is the least number of geometric sequences that Jo needs to pick in order to clear the table?

HINT: You may need to use sequences with a ratio that is a whole number or a fraction.

2007-12-05 03:15:09 · 2 answers · asked by Anonymous in Mathematics

2007-12-05 03:13:29 · 6 answers · asked by Yankee C 1 in Mathematics

a sequence is defined recursively. Find the first five terms

A_n= 2A(n-1)+A(n-2)
when: A_1= -2; A_2= 4

2007-12-05 03:12:25 · 2 answers · asked by JahAtmosphere 1 in Mathematics

Write the following expression as a sum and/or difference of the logarithms.

log (all this next part is in one big parethesis: sqrt(x+2)/x^2-x


I know the rules....I just need the answer ASAP...I thought I knew the answer, but it was wrong and I don't know why? Please help me....I promise to give 10 to best answer! think the answer is (1/2 log (x+2)) - log x - log (x-2)........you all agree that just answered or anyone?

2007-12-05 03:08:12 · 6 answers · asked by ☺♠JonasJay♫♦ 5 in Mathematics

Given the reaction 2 NOCl(g) 2NO(g) + Cl2(g) + heat, when the reaction reaches equilibrium, the concentration of NOCl is found to be 1.65M, that of Cl2 is found to be 0.40M, and that of NO is found to be 0.80M.
a. Calculate the equilibrium constant for the reaction
b. Give three ways to help shift the equilibrium to the right.

2007-12-05 03:07:09 · 1 answers · asked by nxml81 1 in Chemistry

2007-12-05 03:05:12 · 5 answers · asked by Anonymous in Weather

Chandra has 2 liters of a 7% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of 42% solution?

a. 5 liters of 57% solution
b. 5 liters of 56% solution
c. 5 liters of 54% solution
d. 5 liters of 59% solution

2007-12-05 03:03:57 · 2 answers · asked by . 1 in Mathematics

There's no specific problem I need solved at this time, but is there like a formula I can use to find this value?

2007-12-05 03:03:56 · 17 answers · asked by neopiancardcaptorirene 2 in Physics

2007-12-05 03:03:30 · 1 answers · asked by Anonymous in Chemistry

2007-12-05 03:02:04 · 9 answers · asked by Anonymous in Biology

2007-12-05 02:59:38 · 3 answers · asked by Lova girl 2 in Chemistry

2007-12-05 02:57:34 · 1 answers · asked by Anonymous in Chemistry

2007-12-05 02:56:14 · 6 answers · asked by Fmxfiloz 1 in Biology

2007-12-05 02:56:03 · 16 answers · asked by Anonymous in Biology