Science & Mathematics - 24 October 2007

2007-10-24 17:36:14 · 4 answers · asked by angelonavaro 1 in Other - Science

the integral is.....

3dx / x^2+6x+10

the 3dx is over the rest of the equation, i know you have to complete the square on the bottom first, which will be (x+3)^2 + 1. I need to use the substitution method where you let something equal u, then find du. Please help! I have a test in about 8 hours and need to know this.

2007-10-24 17:35:32 · 3 answers · asked by WV_Guy 3 in Mathematics

Suppose that we don't have the formula for g(x) but we know that g(3) = 3 and g'(x) is equal to the formula below for all x Sqrt(x^2+7) use linear approx. to find g(2.95) and g(3.05)

I have no idea how to start this..can someone clue me in please?

2007-10-24 17:35:21 · 2 answers · asked by m_carl 1 in Mathematics

have you ever been to one, and what did they say?

2007-10-24 17:33:25 · 19 answers · asked by cuteness 4 in Parapsychology

1. CH3 OH + O2 --> CO2 + H2 O

2. Al + HNO3 --> H3 + Al(NO3)3

3. (NH4)2 Cr2 07 --> Cr2 O3 + N2 + H2O

All of the numbers go below the previous letter. Like H(2 below) and O

2007-10-24 17:31:58 · 2 answers · asked by Leeler 1 in Chemistry

Describe the set of all possible integer solutions for the following system of congruences:

x ≡ 5 (mod 6)
x ≡ 1 (mod 7)

2007-10-24 17:31:45 · 3 answers · asked by 3545 2 in Mathematics

Should kinetic energy be conserved in all cases - according to physics theory? Explain your answer.

2007-10-24 17:30:26 · 1 answers · asked by Anonymous in Physics

The price-demand and cost functions for the production of microwaves are given as
P=205-x/40

and

C(x)=86000+100x,

where x is the number of microwaves that can be sold at a price of p dollars per unit and C(x) is the total cost (in dollars) of producing x units.


(A) Find the marginal cost as a function of x.
C'(x)=
(B) Find the revenue function in terms of x.
R(x)=
(C)Find the marginal revenue function in terms of x.
R'(x)=

Ok, so for the first one do I do the derivative...which will be just 100?

Not sure, I'm confused!

2007-10-24 17:27:34 · 1 answers · asked by RedSparkle 1 in Mathematics

What is the third power of 364392 (ex. a x a x a=364392)

2007-10-24 17:26:33 · 12 answers · asked by Anonymous in Mathematics

2007-10-24 17:26:23 · 6 answers · asked by mccyf 1 in Other - Science

3.14..........

2007-10-24 17:26:15 · 9 answers · asked by butt 1 in Mathematics

du= (2) {(lnx) / (x)}
v= (3x^2) / (2)
the eqn is vdu..i dont get how it is this
3xlnx
what was cancelled?

2007-10-24 17:26:05 · 1 answers · asked by ruby 2 in Mathematics

Find all values of n that solve the equation φ(n) = n/2 using the following formula:

φ(n) = n(1 - (1/p_1))(1 - (1/p_2)*...*(1-(1/p_r)) <- where p_1,p_2,...p_r are the distinct primes that divide n.

2007-10-24 17:24:57 · 1 answers · asked by 3545 2 in Mathematics

Does anyone know where on the net I can find a number generator? Like something that will produce all the numbers between 1900 - 2000 type thing?

Like 1901, 1902 etc.

Any help's appreciated :)

2007-10-24 17:21:19 · 4 answers · asked by Anonymous in Mathematics

So below is the problem and I want to know how to find the location of the center of mass. The book I have is not very clear on the fact of 3-D objects.

Figure 9-27 shows a cubical box that has been constructed from metal plate of uniform density and negligible thickness. The box is open at the top and has edge length 40 cm. Find the coordinates of the center of mass of the box.
______cm (x-coordinate)
______cm (y-coordinate)
______cm (z-coordinate)

Link to image: http://www.webassign.net/hrw/09_33.gif

2007-10-24 17:20:04 · 3 answers · asked by eggyu74 3 in Physics

5/x is 5 over x

2007-10-24 17:19:15 · 5 answers · asked by Anonymous in Mathematics

2007-10-24 17:10:08 · 9 answers · asked by Anonymous in Weather

This may be a silly question, but I have a problem with electronic breaking around me. I have gone through 7 dvd players, 5 cell phones, 3 computers.... the list goes on. WiFi doesn't work when i am in the room either. When I visit clients even their electronic go nuts.
What is going on here? Do our bodies put out different amounts of electricity? Even to the point of electronic going nuts around us? If this is the case have you ever heard of this? What do I do? Please help if you can.
(and no I am not breaking the electronic either =) ... )

2007-10-24 17:06:36 · 3 answers · asked by MerryBerry 2 in Engineering

cant figure out

2007-10-24 17:05:27 · 4 answers · asked by aka_oximoron 1 in Mathematics

besides insticts....

2007-10-24 16:55:51 · 3 answers · asked by Anonymous in Biology

2007-10-24 16:53:44 · 3 answers · asked by khaja p 1 in Mathematics

Ok, I seriously need this ASAP.

the question says, The density of methanol is 0.796 g/cm3. Is 4.00 mL of methanol a satisfactory volume to use in this experiment? Justify your answer with a calculation.

THe only thing I have for methanol is its molecular weight, 49.28 g/mol.

But I dont have the temperature of the REQUIRED moles of methanol!!! how am i supposed to do this??? This is what I did:

Since, density = mass/volume
0.796g/cm3 = mass / 4cm3
Mass= 3.184 g

Further, number of moles = mass / molar mass
n = 3.184 g / 49.28 g/mol
n= 0.06448 mols

To find the required number of moles, we use the ideal gas law:
PV = nRT
n = PV/RT (T ???)
n =

and what about the volume?? All i know is that the molecular weight of the IDEAL/ required methanol is 32.04 g/mol

HELP ME FOLKS PLEASEEE QUICK. THANKSSS

2007-10-24 16:53:35 · 3 answers · asked by Curious 1 in Chemistry

2007-10-24 16:51:46 · 2 answers · asked by Anonymous in Physics

2007-10-24 16:51:28 · 8 answers · asked by Anonymous in Mathematics

If you could live on saturn what is 5 thing you would bring and want to do there

2007-10-24 16:50:31 · 5 answers · asked by Anonymous in Astronomy & Space

1. Do the constant volume and constant pressure heat capacities apply for solids and liquids or for gases/(ideal gases?) only?

2. In calculus, what is the difference between d and (delta)? Using entropy, what would be the difference between dS and (delta)S. Also what does the backward looking "6" represent in partial derivatives {ex: partial f/partial x when you have f(x,y)}?

3. How is calculating (delta)H and (delta)U different for solids and liquids that it is for ideal gases?

2007-10-24 16:47:36 · 1 answers · asked by bob oso 2 in Chemistry

A particle moves along the curve: y = sq.rt.(1 + x^3). As it reaches the point (2,3), the y-coordinate is increasing at a rate of 4 cm/s. How fast is the x-corrdinate of the point chaning at that instant?

Can someone show me how to figure this out?

2007-10-24 16:47:08 · 2 answers · asked by the Jam 2 in Mathematics

i've been on prozac for the past few years, all major complications i had to the medicine worked itself out. as far as lithium i've only been on since march.

suddenly, for about the last three-four weeks i've had insane itching feet. there is no rash or anthing, it jus itches like crazy. and now my hands are doing the same things. i was wonder if this could be a side effect of the medication?

2007-10-24 16:47:07 · 2 answers · asked by Meep 3 in Medicine

2007-10-24 16:46:47 · 2 answers · asked by Anonymous in Biology

Let's say, I have H_2O, BF_3, CH_4, NaF, and HF. How do I figure out which substance has the highest melting point?

Thank you

2007-10-24 16:41:13 · 2 answers · asked by guyava99 2 in Chemistry