Science & Mathematics - 28 November 2007

I can't figure this bloody equation out!!! >=(

7x-5y=40
3x-2y=16

It looks easy but i can't figure it out...Show your work, please..

2007-11-28 06:50:11 · 3 answers · asked by Water Temple boss : Morpha 1 in Mathematics

ZnS + HCl ======> ?
Na2CO3 + HCl ======>?
ZnS is Zinc Sulfide and Na2CO3 is sodium carbonate and HCl is hydrochloric acid...and i need these balanced and completed.

2007-11-28 06:48:38 · 4 answers · asked by naknoi 5 in Chemistry

Would this be correct?

H+ + HCN + NaCN --------> H2CN + NaCN

Thanks!

2007-11-28 06:47:44 · 3 answers · asked by Anonymous in Chemistry

i Cant figure out how to solve these 3 questions please help.Please help i dont understand and please dont just give me the answer. try to explaine the steps to me thank you very much

A force of 825NIS NEEDED FOR TWO PEOPLE TO PUSH A CAR 35 M. How much work is done? HOW MUCH ENERGY DID THE PEOPLE EXPEND?

Sarah pulls her little red wagon along a path a distance of 16 m. She exerts a force of 95 N at an angle of 35 degrees with respect to the direction of motion. How much work does she do?

An electric motor develops a 65 KW of power as it lifts an elevator 17.5 m in 35 sec. What average force does the motor ecert?
Please help i dont understand and please dont just give me the answer. try to explaine the steps to me thank you very much

2007-11-28 06:46:44 · 5 answers · asked by ajnsdsjafnsafu 1 in Physics

2007-11-28 06:46:27 · 16 answers · asked by Brook E 3 in Mathematics

i need this in 2 minutes of i get an f on my homework. HELP

2007-11-28 06:45:43 · 4 answers · asked by Anonymous in Geography

Theres 3 sections here i dont understand. Im not very good at math and this is over my head.

Simplify the following expressions by performing the indicated operations-
1. 3 (sqrt) x * 3 (sqrt) x
2. (sqrt) t * (sqrt) t
3. 3 (sqrt) R / 3 (sqrt) x

Express each of the following radical expressions using fractional exponents.
1. 4 (sqrt) x^2
2. (sqrt)t
3. 4 (sqrt) x^7
4. 1 / 5(sqrt) x^2

write these using only positive exponents (no signs inbetween except on #1 and #4 (division)
1. x^2 / y^-3
2. x^3 y^-5
3. x^2 y^-4 z^4
4.x^2 / y^-1/2
5. x^2 y^3 t^-4 z^-6 w

2007-11-28 06:45:34 · 4 answers · asked by Swavey 2 in Mathematics

2007-11-28 06:42:59 · 3 answers · asked by Anonymous in Astronomy & Space

2007-11-28 06:41:47 · 6 answers · asked by isacm87 2 in Astronomy & Space

My wife always says anyone from Nebraska is a yankee. Is that true?

2007-11-28 06:41:02 · 12 answers · asked by GI Joe 1 in Geography

2007-11-28 06:40:54 · 9 answers · asked by Bill W 【ツ】 6 in Mathematics

is the answer 6 0r square6

2007-11-28 06:40:08 · 6 answers · asked by thonia 1 in Mathematics

1. what is the cube rood of 9x?

2. (12 x^1/2y^-1 / 27 x^-1y^-1/3)^-1/2

2007-11-28 06:39:05 · 2 answers · asked by Kitz 1 in Mathematics

Suppose you wanted to drive from PA to the West Edmonton Mall in Alberta,Canada.......
What states will u drive through ?
How many hours will it take you if u r going 60MPH ?
What direction would you drive ?
How many miles is it ??

Please help me out with this !!!!!!!!!

2007-11-28 06:38:29 · 9 answers · asked by Caitlyn C 2 in Geography

Angela worked a total of 45 hrs at mcdonalds and toys r us. she worked twice as many hrs at mcdonalds than toys r us. HOw many hrs did she work at mcdonalds? HOW DO YOU DO THIS??!?!?

2007-11-28 06:36:12 · 22 answers · asked by Anonymous in Mathematics

Provide a counter exampleforc each statement.

1.(n+2)3 =n3 +2 3 (I don't know how to make the numbers smaller, sorry)

Answer:

2. x2 > x for all values of x.

Answer:

Tell whether each statement is tru or false. if it is false, give a counterexample.

3.For every positive integer n,n2 +n +11 is a prime number.

Answer:


4.The result of multiplying the sum of the first n postive even integers by 4 and then adding 1 is always a perfect square.

Answer:

2007-11-28 06:35:57 · 3 answers · asked by Jackie 2 in Mathematics

1. Two integers that are coprime are also prime.
2. If the sum of two complex numbers is real, the summands are complex conjugate of each other.
3. If the derivative of a function is increasing, the function is increasing.
4. If an integer is the product of two primes, then it has four distinct divisors.

2007-11-28 06:35:34 · 2 answers · asked by homeboy187nic 2 in Mathematics

I only have around $400-500 dollars not much but hopefully i can get a decent one. soo what is the best brand for viewing deep space?

2007-11-28 06:33:46 · 0 answers · asked by jason h 1 in Astronomy & Space

How about when it is further from the sun?

2007-11-28 06:31:49 · 3 answers · asked by isacm87 2 in Astronomy & Space

When your dealing with sin and cos,is it correct that the sin is your x axis and your cos is your y axis? Or is it the other way around?

2007-11-28 06:29:27 · 6 answers · asked by Anonymous in Mathematics

√2y+8=2√y

2007-11-28 06:28:54 · 2 answers · asked by robert78gdl 2 in Mathematics

2007-11-28 06:28:02 · 22 answers · asked by Anonymous in Other - Science

3√28+√63=

2007-11-28 06:27:51 · 2 answers · asked by robert78gdl 2 in Mathematics

is the answer suare 6 0r 6

2007-11-28 06:27:37 · 5 answers · asked by thonia 1 in Mathematics

Just wondering...

2007-11-28 06:26:08 · 10 answers · asked by Mand 2 in Zoology

I'm not asking for anyone to do it for me. I just need someone to expain it to me, but if you know what to do, by all means go right ahead.

You are handed a "mystery" pea plant with long stems and axial flowers, and asked to determine its genotype as quickly as possible. You know the allele for long stems (L) is dominant to that for dwarf stems (l) and that the allele for axial flowers (A) is dominant to that for terminal flowers (a).

1. What are all the possible genotypes for you mystery plant?

2. Describe the one cross you would do, out in your garden, to determine the exact genotype of your mystery plant.

3. While you are waiting for the results of your cross, you go back inside and sit at your desk. You make a seperate prediction of results for each possible genotype listed in part one. How do you do this?

Make these predictions, using the following format: "If the genotype of my mystery plant is _____, the plants resulting from cross will be____."

2007-11-28 06:25:37 · 3 answers · asked by rdz1645 2 in Biology

1.A (X,Y) is the mid-point of BC. B is the point (x1,y1). Show that C is the point
(2X-x1,2Y-y1)

2.The variables x and y are thought to related by a law of the form y=ax(powerb) , where a and b are
constants.

(i) Using the data below, verify that this is to be the case
x=2 y=6.32
x=3 y=7.24
x=4 y=7.98
x=5 y=8.60
x=6 y=9.12

ii)Estimate the values of a and b , giving your answers to appropriate degree of accuracy.
(iii) Estimate the value of x when y =7.50 giving your answer correct to two significant figures
(iv) If one of the measured values ( x , y ) is (7.00, 9.00); determine the relative error in this
measured value of y , to 3 s.f.

2007-11-28 06:24:46 · 1 answers · asked by Anonymous in Mathematics

2007-11-28 06:24:01 · 4 answers · asked by Anonymous in Astronomy & Space

2007-11-28 06:22:54 · 2 answers · asked by Anonymous in Biology

i am trying to research on gaming and wonder if anyone has already put bacarrat game into a form of mathematical question

2007-11-28 06:21:27 · 1 answers · asked by warrior 1 in Mathematics