Mathematics - 31 October 2007

p(x,y)=(4 x)(3 y)(2 3-x-y)/(9 3)
where (4 x) means number of comb. of x chosen from 4 items.

domain 0<=x<=3, 0<=y<=3, 1<=x+y<=3

find the cov(x, y)
please show me your solution with clear explanations
thank you. really want to learn

2007-10-31 06:52:04 · 1 answers · asked by Anonymous

For the tax yr 98-99 the p.allowance set against tax was £4045 for a single person. After this and any other allowances were deducted the first £4300 of income was taxed at 20%, the next £22800 was taxed at 23% and the rest at 40%. For a single person with no other allowances to deduct calcualte the tax paid on a salary of £15000 pounds p.a

2007-10-31 06:49:11 · 3 answers · asked by Anonymous

How do you show if the external direct product of Z_3 and Z_9 is isomorphic to Z_27?

2007-10-31 06:48:57 · 2 answers · asked by Anonymous

x^2y^2-6xy=27
find a point (a,b) on the C with a>0 at which the tangent to C has the slope m=-1. give the coordinates of the point below:
a=________
b=________

2007-10-31 06:44:03 · 4 answers · asked by Anonymous

I need help finding the instantaneous rate of change of y with respect to x for the curve of

xe^y+x=xy

All help is greatly appreciated.

2007-10-31 06:41:09 · 8 answers · asked by Anonymous

2007-10-31 06:40:35 · 9 answers · asked by cupid blue 1

2x+1+8x=6x+37
1(4x-6)=6
2(-2x-5)=-18
-1(-1x+1)=8
4(3x+9)=108
-2(2x-2)=-8

2007-10-31 06:35:44 · 7 answers · asked by Anonymous

2007-10-31 06:35:19 · 2 answers · asked by Anonymous

1/2x + 5 = x

in the back of our book we have the answers and it says 10 but i cant figure it out plz! help!

2007-10-31 06:34:31 · 6 answers · asked by ms-adidas 4

(g(x))^2+11x=x^2g(x) +22
and that g(2)=4, find g'(2).
g'(2)____________

2007-10-31 06:29:59 · 5 answers · asked by Anonymous

2007-10-31 06:25:37 · 34 answers · asked by Anonymous

Adult tickets for the senior class play cost $5 each and the student tickets cost $3. A total of 1060 tickets costing $4500 were sold. How many student tickets were sold?

2007-10-31 06:25:37 · 9 answers · asked by wish on a star 1

2007-10-31 06:23:04 · 4 answers · asked by xoxjaime06xox 1

7. 7x^2+5x-2
8. 3x^2-8x-3
9. 2x^2-8x+8
10. 12x^2+8x+1

2007-10-31 06:22:33 · 2 answers · asked by Diamond E 1

2. 3x^2+10x+8
3. 5x^2+24x+27
4. 4x^2-12x+8
6. 9x^2+37x+4

2007-10-31 06:09:40 · 5 answers · asked by Diamond E 1

1. Simplify:
5/3+2i
2. The area of a room with length "3-2i" and width "4i" is

3+i

8+12i

-8+12i

-8i2+12i

3. The conjugate of the complex number "3+2i" is
3-2i

3+2i

-2i

3


Thanks so much!!

2007-10-31 06:07:20 · 3 answers · asked by stringsdepotplus 2

At a football game, 200 souvenirs were sold, some at $1.50 each and the rest $2.50 each. If the proceeds from the sales totaled $389, how many of each kind were sold?

2007-10-31 06:01:12 · 8 answers · asked by wish on a star 1

University thearter sold 463 tickets for a play. Tickets cost $24 per adult and $12 per senior citizen. If total receipts were $7224, how many senior citizen tickets were sold?

2007-10-31 05:52:43 · 5 answers · asked by Anonymous

Foci: (-10,0) (10,0)
Vertices: (-5,0) (5,0)

2007-10-31 05:35:53 · 2 answers · asked by pitbulgurl 1

My son is learning signed numbers at school. It's been years since I've done this! Can someone please help explain this to me so I can better help him?

Here is an example problem:

3²(-4)²/-1

Following the order of operations you would solve for 3² and (-4)² giving you 9 and -16.

Then you'd multiply 9 by 16 giving you -144.

The problem would then be -144/-1 and the end result would be +144. Right?

I was wrong. The correct answer [according to the book] is +5. Please help me figure this out! I just don't understand anymore!! Haha.

Thanks!

2007-10-31 05:13:26 · 15 answers · asked by Karma Lucille 1

2007-10-31 05:03:33 · 4 answers · asked by Anonymous

A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 35 feet, If the distance across the top of the mirror is 56 inches, how deep is the mirror in the center?

2007-10-31 05:02:55 · 2 answers · asked by pitbulgurl 1

I'm taking Discrete & I know that a^k = 1 mod n, but is there a shortcut to finding what k equals??

if u can help plzz thnks :]

2007-10-31 05:02:33 · 1 answers · asked by Anonymous

One number is two less than a second number. Twice the second number is 8 less than 3 times the first. Find the two numbers.
Pre-algebra - by Mary Lee Vivian, Margaret Thomas - 128 pages
Algebra - by Mary Lee Vivian, Margaret Thomas - 128 pages
The popular educator - by Popular educator

2007-10-31 04:54:13 · 9 answers · asked by Anonymous

a. They were enslaved by the Union army thinking that they would gain their freedom.

b. They had to face the biases that whites had about their abilities and what they were capable of doing.

c. White soldiers felt that African American soldiers had better benefits then they did.

2007-10-31 04:47:10 · 2 answers · asked by Anonymous

2007-10-31 04:46:55 · 2 answers · asked by Sanflo 1

Give an ordered pair of numbers that satisfy the equation

4x+y=7

2007-10-31 04:45:44 · 7 answers · asked by lilcarrollw 2

a) 5f number=?

b)4p number=?

c) 5d number=?

d) n=2 number=?

2007-10-31 04:42:02 · 2 answers · asked by Christina S 1

Tom invested $11,000, part at 9% and part at 10% simple interest. How much money was invested at each interest rate if the total interest earned from both is $1050?

2007-10-31 04:37:53 · 3 answers · asked by kxl3432 1

How many F's are in the following sentence?

FINISHED FILES ARE THE RE
SULT OF YEARS OF SCIENTI
FIC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS..



(Look again before you answer!)

2007-10-31 04:36:35 · 9 answers · asked by Me M 1