Mathematics - 20 September 2007

2007-09-20 23:28:20 · 11 answers · asked by Satish G 1

I cannot do it and all those I know believe it cannot be done in terms of known functions. Can you prove us wrong?

2007-09-20 23:25:09 · 6 answers · asked by Anonymous

find parametric equations for the lines of intersection of the planes: -3x + 2y + z = -5 and 7x + 3y - 2z = -2

2007-09-20 23:07:54 · 2 answers · asked by Anonymous

A curve is defined by parametric equations x=t^2 and y=t^3. A line intersects the curve at t=(-2) and t=3. Find the area enclosed by the line and the curve.

My book says the area is 110. I can get this by integrating the parameters and using t=(-2) and t=3 as the limits. However I could not see why this worked so I found the equation of the line and the curve and then integrated: (the line minus the curve)dy. Using y=(-8) and y=27 as the limits. This time I got 62.5 as the answer.

I can not see why my technique isn't working. It is just a basic integration.

2007-09-20 22:26:25 · 1 answers · asked by eazylee369 4

2007-09-20 21:39:29 · 8 answers · asked by momo 1

a radiator with a 6 gallon capacity is filled with 50% antifreeze solution. how much must be drained so that adding pure antifreeze gives a 60% antifreeze solution?

2007-09-20 21:13:18 · 4 answers · asked by carlos t 1

1.) show that if G, G', and G'' are groups and if Ø: G -> G' and ¥: G' -> G'' are homomorphisms, then the composite map ¥Ø:G-> G'' is a homomorphism.

2.) Let Ø:G-> H be a group homomorphism. show that Ø[G] is abelian if and only if for all x, y element of G, we have xyx^-1y^-1 element of Ker(Ø).

3.) Let G be any group and let a be any element of G.
Let Ø: Z-> G be defined by Ø(n)= a^n. show that Ø is a homomorphism. Describe the image and the possibilities for the kernel of Ø.

4.) let Ø: G-> G' be a homomorphism with kernel H and let a element of G. Prove the set equality {x є G l Ø(x) = Ø(a) } = Ha.

2007-09-20 19:46:47 · 2 answers · asked by Anonymous

2007-09-20 19:34:52 · 9 answers · asked by jatin b 1

2007-09-20 19:29:07 · 1 answers · asked by AnonymousOne 2

1.show that the equation

sin (x - 60' ) - cos ( 30' - x ) = 1


can be written in the form cos x = k, where k is a constant

2.Prove that sin^2 @ ( cot^2 @ - tan^2 @ ) = 4 cos 2@

@ represents pheta

^ represents to the power of.

2007-09-20 19:22:00 · 5 answers · asked by Mystic healer 4

(1/10)^ 15 * (1/1000)^ -6=
/ - fraction line
*-multiplicated
^ -raised to the power ...

2007-09-20 19:15:01 · 6 answers · asked by dragoi_stefan06 2

find values of X in domain [0,2pi]

sin(x+pi)+cos(x-(pi/2))=1
this is what I did. is the 1st circle ze right thing?
http://i3.tinypic.com/53p67vo.jpg

the right answer is:
x=pi/6 ; 2pi/3 ; 7pi/6 ; 5pi/3
but how do I get to it???

2007-09-20 18:58:04 · 2 answers · asked by Anonymous

The measure of the angles of a triangle is 26° less than twice the measure of another angle. The measure of he third angle is 35°. Find the measure of the other two anges.

2007-09-20 18:49:38 · 6 answers · asked by rbrulesamanda 2

Just one more 22.47-17.58=? or 1.12am next day -11.50 the previous day=?

2007-09-20 18:45:11 · 3 answers · asked by BJJCASH 1

[ss is "subscript"]
... i'm not even sure of which meathod of proving i have to use (i.e. induction) for these problems, but basically im given a sequence with a couple of terms defined by x[ss: m+3] = something with all x having a subscript containing "m". then i'm asked to prove a sequence defined by x[ss: n] = with the terms to a power of "n"

how am i supposed to prove this when one is "m" and the other is "n"....


...umm something to note, i tried the first couple of sequences with but defintions of the sequences and the first few terms were equal. so can i say that the definition containing "m" equals the definition containing "n"

(hope that wasn't too confusing ^_____^)

2007-09-20 18:43:14 · 2 answers · asked by Anonymous

can some please tell me how they got the answer to this statistics problem ?

compute the z score

2400 - 2600
------------------ = 0.30
670

2007-09-20 18:30:09 · 4 answers · asked by maxmac97 1

2007-09-20 17:57:20 · 12 answers · asked by Anonymous

What is the slope of the tangent line to the graph of y=f(x) at the x = a = 2, i.e., at the point (2, [ 1/2]) ?

2007-09-20 17:43:36 · 4 answers · asked by Lauren 1

Numeric Response:
Use a system of equations to solve a problem involving coins.

Ryan has $21.40 in dimes and quarters. He has 103 coins in all. How many of each type of coin does he have?

2007-09-20 17:40:08 · 7 answers · asked by Anonymous

2007-09-20 17:34:02 · 6 answers · asked by Anonymous

The direction says "Find the equation of the line described in slope-intercept form" The question is: Has an x-intercept of 5 and a y-intercept of -3. I know where the -3 belongs but I don't know where to plug in the -5. Please explain :]
Thanks

2007-09-20 17:33:43 · 6 answers · asked by Anonymous

A friend is waiting to see if anyone can come up with a solution..
Thx

2007-09-20 17:32:00 · 4 answers · asked by Steve 7

A square will tessellate a plane; can we always find a square that will tessellate a rectangle?

2007-09-20 17:24:11 · 5 answers · asked by Anonymous

Determine all values of the constant "a" such that the following function is continuous for all real numbers.

http://img525.imageshack.us/img525/526/mathxq4.png

i dont have the faintist idea on how to do this

2007-09-20 17:22:21 · 4 answers · asked by adr k 2

Is there anyone out there who knows anything about biostatistics. I have a homework assignment due Monday & I have no clue how to solve one of the problems. Here's what the paper says,

2007-09-20 17:14:17 · 3 answers · asked by little_ash_2003 3

2007-09-20 17:14:00 · 4 answers · asked by Anonymous

can someone explain this to me?

2007-09-20 17:10:12 · 8 answers · asked by jorie715 2

Not too sure on calculating average velocity, here is a question

if a ball is thrown into the air with a velocity of 40ft/s its height in feet t seconds later is given by y=40t-16t^2

find the average velocity for the time period beginning when t=2 and lasting

a) .5 sec
b) .1 sec

2007-09-20 17:08:30 · 3 answers · asked by burgler09 5

Find the first three terms in the expansion of

(i) (3 + x) ^5

Please show your workings clearly. Thank you. =)

2007-09-20 17:05:47 · 4 answers · asked by Anonymous

2007-09-20 16:57:42 · 2 answers · asked by Anonymous