Science & Mathematics - 30 October 2007

ABCD is a rectangle in which the co-ordinates of A and C are (0,4) and (11,2) respectively. The gradient of ab is -5.
1)Find the equations of ab and bc
2)Show that the co-ordinates of b are (1,-1)
3)Find the area of rectangle ABCD

The points A(2,5) and B(-4,13) lie in the opposite ends of a diameter of a circle with centre C.
a) Find the radius and centre of the circle
b)Find the equation of the circle in the form x^2+y^2 +px+qy+c=0
c)Find the equation of the normal at a and the tangent of b

If you can do ANY of these please do, and put how you do it. Sorry-but i got stuck!!!

2007-10-30 23:57:56 · 1 answers · asked by xMwahahahahahahax 3 in Mathematics

What kind of aircraft vessel, could not be picked up on radar, make no sound for human ear detection, and exactly what kind of energy could it possibly be powered by???? Please be specific.

2007-10-30 23:38:28 · 8 answers · asked by AK/BRAT 2 in Physics

2007-10-30 23:12:10 · 4 answers · asked by Jimmy 1 in Engineering

Evaluate the following expression when z = 12: (z + 8)/4

A. 5
B. 11
C. 14
D. 20

2007-10-30 23:10:49 · 4 answers · asked by Anonymous in Mathematics

Solve for x: 2x + 3 = 7.

A. 4
B. 2
C. 5
D. 8

2007-10-30 22:59:20 · 12 answers · asked by Anonymous in Mathematics

Solve for h: 21 = 9 + 3h.

A. 9
B. 4
C. 10
D. 36

2007-10-30 22:58:49 · 16 answers · asked by Anonymous in Mathematics

A. 25
B. 15
C. 4
D. 100

2007-10-30 22:46:49 · 9 answers · asked by Anonymous in Mathematics

another math prob!!!

2007-10-30 22:40:07 · 12 answers · asked by Anonymous in Mathematics

but i read in the papers that a scientist proved him to be wrong what did he say.please explain in simple language.

2007-10-30 22:24:27 · 14 answers · asked by Anonymous in Physics

2007-10-30 22:23:59 · 2 answers · asked by mahesh s 1 in Engineering

2007-10-30 22:08:33 · 8 answers · asked by bir.salem 2 in Chemistry

2007-10-30 21:55:51 · 4 answers · asked by daudzai 2 in Engineering

what do conservationists do to increase the population of endangered species?

2007-10-30 21:55:45 · 2 answers · asked by tyron 1 in Zoology

You’re asked to convert a large value (given in centimeters) to its equivalent value in miles. You already know that 30.48 centimeters equals 1 foot. You’ll also need to know that

A. 16 ounces = 1 pound. C. 3 feet = 1 yard.
B. 2.54 centimeters = 1 inch. D. 5280 feet = 1 mile.

2007-10-30 21:49:22 · 9 answers · asked by Saran K 2 in Mathematics

2007-10-30 21:40:34 · 2 answers · asked by Ashfaq K 1 in Engineering

Standard solar cells only use the red spectum of light to convert light to energy. Is it possible to change other wave lengths to red by the use of lenses?

2007-10-30 21:28:43 · 3 answers · asked by bookheflin 1 in Physics

Find all the zeros of the following:

g(x) = 2x^5 - x^4 - 5x^3 + 10x^2 - 2x - 4

2007-10-30 21:27:32 · 3 answers · asked by beeboroachgoingon197 1 in Mathematics

2007-10-30 21:25:49 · 4 answers · asked by Anonymous in Biology

Please lick on this http://en.wikipedia.org/wiki/Circular_orbit

It is discribing circuler orbits as elliptical orbits.
i am confused . i was thinking circuler and elliptical orbits are two different things. in my understanding circuler orbits has eccentry equal to zero while elliptical orbits have eccentry of less than zero. please highlight me on that. thanks in advance.

2007-10-30 21:18:28 · 4 answers · asked by Omar 1 in Astronomy & Space

http://www.flickr.com/photos/16952201@N06/1804267483/

Right or nearest guess gets 10 points! Just guess in terms of features...facial or physical...I am 5' 11' (average for my country), a bit muscularly-built...

I have NOT originated from a small unheard of country, and the vast majority of people know my country of origin...I believe the country is medium (or large sized) and has quite a bit of history behind itself...

I will give additional details with ur request...

thank u in advance for answering...and good day to u....

clue: it is between Northwestern (and central) Asia, North Africa, Mediterranean, Central America...u think!

2007-10-30 21:09:31 · 24 answers · asked by A S 1 in Geography

L1 : (x+3)/1 = (y-7)/4 = (z-2)/1

L2 : a line goes through (0,2,1) and (-4,4,1)

i found the parametric equations

L1: x = -3 - t, y = 7 + 4t, z = 2 + t
L2: x = -4s, y = 2 + 2s, z = 1

i set L1 = L2 but i can't find any s and t values that satisfy.

I used t = -1 initially and plugged them into L1's parametric equation and got the answer in the back (-2,3,1), but if i solve for s which I got, was s = 2, i get (-8,6,1).

HELP!!!

2007-10-30 21:05:07 · 2 answers · asked by fye 1 in Mathematics

Tonight I was out looking for the comet Holmes and I noticed an unusually bright "star" near the moon. It's a yellowish color and right about the area where I Gem (???) would be - the linked hands in Gemini. Is this a planet, or could I possibly be seeing the star magnified by the moon by the lensing effect (I forget the proper term).

By the way, I'm pretty sure I found the comet, but this other object is much more interesting.

If it matters, I'm in northern California about 100 miles north of the Bay Area.

2007-10-30 20:54:27 · 2 answers · asked by Justin H 7 in Astronomy & Space

i am analysing my data from drugs treatment using animal model. any idea to estimate data from a standard curve, for example identifying LD50 value. I mean any software for this function (free software?))?

2007-10-30 20:50:19 · 4 answers · asked by june81 2 in Mathematics

Please help me with this Maths question!!!!
"OABC is a regular tetrahedron. M,N,O and P are the midpoints of OA,OB,AC,BC respectively. Let OA=a, OB=b, OC=c. Using vector methods, prove that MQ is perpendicular to NP"

Thanks a lot in advance.

2007-10-30 20:47:34 · 1 answers · asked by coucou_bambie 2 in Mathematics

2007-10-30 20:46:40 · 6 answers · asked by Anonymous in Astronomy & Space

ex. Tylenol Head Cold Medicine

2007-10-30 20:43:56 · 1 answers · asked by Michelle 1 in Medicine

2007-10-30 20:41:55 · 4 answers · asked by Anonymous in Medicine

2007-10-30 20:38:03 · 2 answers · asked by generalche22 3 in Mathematics

2007-10-30 20:29:40 · 3 answers · asked by guy17 2 in Physics

2007-10-30 20:04:05 · 8 answers · asked by Anonymous in Physics