Science & Mathematics - 25 July 2007

im struggling with this math.
The perimeter of a triangle is 7a-11b.If two of its sides are 2a+b and a-9b,what is the third side
*hint*_ _ _ _ b

2007-07-25 18:17:49 · 2 answers · asked by Anonymous in Mathematics

1-e^(2x)=3 and ln(2x+1)^2=12


details for both problems please

2007-07-25 18:17:43 · 3 answers · asked by gary l 1 in Mathematics

Express
cot^2 x-1
csc^ x
in terms of sin x

2007-07-25 18:14:35 · 3 answers · asked by Peter 1 in Mathematics

Hi.

I'm trying to find the critical points for the function :

f(x)= x sqrt(x - (x^2))

I don't seem to know what to do after using the product rule with chain rule...

I got:

[(x(1-2x))/(2 sqrt(x-x^2))] + sqrt[x-x^2]

Can anyone show me the steps on how to proceed with this? I would be super grateful.


Thanks!!

PS: I know the answer is 0 and 0.75 --> I need to know the steps.

2007-07-25 18:13:48 · 2 answers · asked by Anonymous in Mathematics

2007-07-25 18:12:50 · 6 answers · asked by wilpovipo 1 in Engineering

Using the data which follows, the delta H(sub F)degree for C2H6(g) is...?

2C2H6(g)+7O2(g) yields 4CO2(g) +6H2O(l) deltaHdegree= -3120 KJ/Mol
C(s)+Os(g) yields COs(g) delta Hdegree=-394 KJ/Mol
2H2(g) +O2(g) yields 2H2O(l) deltaHdegree=-372 KJ/Mol




The ____________is the amount of heat required to raise the temperature of one gram of a substance by 1 degree C.



The term for all forms of energy associated with the specific amount of a substance is____________.




Please answer all three questions! Thanks guys!

2007-07-25 18:01:20 · 1 answers · asked by ~daweed~ 3 in Chemistry

if it is 0 degrees today and it will be twice as cold tomorrow, what will the temperature be?

2007-07-25 18:00:45 · 3 answers · asked by bulldog 2 in Weather

I seen it on the web but just wanted to know what it is.

2007-07-25 18:00:42 · 3 answers · asked by jesse6317 2 in Chemistry

Aerobic respiration, or the process by which animals use energy by breaking down glucose in the presents of oxygen, is described by the equation:

C6H12O6+O2>>>CO2+H2O

Balance the equation.

Calculate how much carbon dioxide is exhaled if an animal inhales 32.0 gO2

What is the source of the glucose and oxygen?

2007-07-25 17:58:33 · 3 answers · asked by Anonymous in Chemistry

, give the equation of the quadratic function, and state what the x and y in the application represent. Choose at least two values of x to input into your function and find the corresponding y for each. State, in words, what each x and y means in terms of your real-life application.

Is there any other examples you can think of besides Ball dropping? or trajectory or determine Max ORD or maximum ?
I need a real life example with the equation and answer.

2007-07-25 17:57:30 · 3 answers · asked by Anonymous in Mathematics

The Reason I am asking this is I would like to know how fast geostationary (communication) satellite's orbit the Earth..I know the ISS orbits at about 16.000 MPH. If anyone know's I would appreciate it but I need accurate answers please...Thank You All

2007-07-25 17:57:17 · 1 answers · asked by karlanax68 1 in Astronomy & Space

The reusable booster rockets of the space shuttle use a mixture of aluminium and ammonium perchlorate as fuel. An equation for the reaction is:

3Al (s) + 3NH4ClO4 (s) --> Al2O3 (s) + 3NO (g) + 6H2O (g) + 2677 kJ

Calculate how much heat is released when the following quantities of aluminium are consumed according to the above equation:

(a) 1 mol
(b) 1 kg

Please help me work out this question because I don't know how to do them...THANKS! :)

2007-07-25 17:53:56 · 3 answers · asked by ♥ Victory ♥ 3 in Chemistry

wat i mean slowy we push our gravity to 20 times or 10 then to 100 and create chain reaction anf whola!! become stronger that superman!! we must be inside a gravity machine to become strong
and remember not to goto the moon or any place where the gravity is less because we will 100% become so weak like those astronuts who come back to earth!!

2007-07-25 17:50:14 · 12 answers · asked by Nice_puppy 1 in Astronomy & Space

I read some time ago that pregnant women (not suffering carbon monoxide poisoning ) treated in a decompression chamber during the period of foetal brain development might be able to increase the childs intelligence by increasing the oxygen available to baby. Never heard any more has any one else knowledge of this?

2007-07-25 17:49:20 · 2 answers · asked by Anonymous in Biology

2007-07-25 17:48:21 · 29 answers · asked by Anonymous in Astronomy & Space

Mg + 2HCl ---> MgCl2 + H2
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl?
How much of the excess reagent in last problem is left over?

thanks in advance

2007-07-25 17:48:16 · 3 answers · asked by playpwnsu 2 in Chemistry

Hi.

can someone help me with this?

I know that

(sqrt [a] - a) X (sqrt [a] - a) = (a - a^2)

but when I multiplied it out using FOIL, I got:

a - 2a^(3/2) + a^2 which does not equal (a - a^2)

I used a as the variable instead of x or else the multiplication sign would be confusing.

Please help me figure out what I did wrong here.


Thank you.

2007-07-25 17:43:26 · 7 answers · asked by Anonymous in Mathematics

2007-07-25 17:40:56 · 2 answers · asked by Anonymous in Chemistry

Anyone?

2007-07-25 17:38:12 · 8 answers · asked by pdgsmr1702 1 in Physics

Explain the statement like dissolves like?

2007-07-25 17:38:03 · 2 answers · asked by Anonymous in Chemistry

if a_1 and d = -2 than what are the first 4 terms in the arithmetic sequence

2007-07-25 17:36:42 · 4 answers · asked by jessie0420 2 in Physics

2007-07-25 17:36:07 · 5 answers · asked by BJ G 1 in Mathematics

2007-07-25 17:32:47 · 5 answers · asked by cmc 1 in Mathematics

Can anyone also explain abit about how fossil fuel power stations work.
Thanks in advance =)

2007-07-25 17:32:15 · 2 answers · asked by Jane 1 in Earth Sciences & Geology

i dont know what happened but i let my little
brother use my computer and like the font
on the internet is really small and i can barely
read it. how can i make it bigger?

2007-07-25 17:31:59 · 3 answers · asked by Anonymous in Zoology

2007-07-25 17:31:38 · 4 answers · asked by kajal 1 in Mathematics

Are you good at math? Complete the last two in this sequence: 1=3, 2=3, 3=5, 4=4, 5=4, 6=3, 7=5, 8=5, 9=4, 10=3, 11=?, 12=?

2007-07-25 17:30:29 · 5 answers · asked by Anonymous in Mathematics

stuck on these problems
averages (arithmetic mean)

What is the average of 9 numbers if the sum of any 4 of them is 20?
a) 20/ 9 b) 4 c) 5 d) 6 e) 36

If a = 2b and b = 3c and the average of a, b, and c is 40, what is the value of a?
a) 6 b) 12 c) 24 d) 36 e) 72

plz show work or explain

2007-07-25 17:27:45 · 4 answers · asked by Anonymous in Mathematics

are they really in demand as what the media says?

2007-07-25 17:27:24 · 5 answers · asked by Anonymous in Medicine

2007-07-25 17:27:04 · 5 answers · asked by Anonymous in Chemistry