Mathematics - 18 August 2007

at the foot of a mountain,the elevation of its summit is 45 degree .after ascending 500m , towards the mountain up an incline of 30 degree , the elevation changes to 60 degree .find the height of the mountain. :)

2007-08-18 21:06:26 · 2 answers · asked by hindol g 1

2007-08-18 20:52:40 · 19 answers · asked by Surender k 1

please tell how to find f(x+2)

2007-08-18 20:45:48 · 6 answers · asked by hindol g 1

Could someone please explain how to do this....
Use the discriminate to prove that kx^2-(k+1)x+1=0 has rational roots if k is rational....
Thanks

2007-08-18 20:28:03 · 5 answers · asked by Anonymous

2007-08-18 20:26:10 · 4 answers · asked by ali 2

Drawing an ace would be 4/52. Then drawing a spade would be 13/51? but then i considered the possibility of getting an ace of spade but i dont know how to take that into account... I'm stuck @_@

The answer is .0192. Please explain how to do it.

Thanks so much in advance!

2007-08-18 19:23:27 · 7 answers · asked by Anonymous

I have to solve for z
The equation is:

4x + 10yz = 0

I don't need the answer, I need to be able to understand how to do the problem, or atleast how to start it.
Thank You.

2007-08-18 18:43:52 · 11 answers · asked by Dan 3

Solve these homework questions for these kids? Especially the ones asking 10-20 questions, that's the whole assignment? Especially americans, we are already battling very hard w/ technilogical laziness and IQ's plummeting, why contribute to the problem? The SATs and college tests are really going to suk when you didnt learn how to do any of it on your own. . .

2007-08-18 18:29:16 · 5 answers · asked by Anonymous

compute arcos(- radical 3 / 2) and also ( -1/ radical 3)

2007-08-18 18:28:05 · 4 answers · asked by Anonymous

I have just started my geometry class last week. The first things I learned about were the point, line, and plane. According to my teacher the point has no size. None at all. Is this true, or is it just unimaginably small? I don't see how points can make up lines and planes if they have no size. Its like 0+0+0 and so on. It equals 0. How can they exist without size?

2007-08-18 18:21:04 · 9 answers · asked by Jack 2

1. Three marbles are to be drawn successively from a bag that contains 4 white marbles, 2 red marbles, and 3 green marbles. (Note that the marbles are not replaced after they are drawn from the bag.) What is the probability that the first marble drawn is white and the second marble drawn is red and the third marble drawn is green?
a. 1/21
b. 1/63
c. 8/243
d. 8/729

2. Using the word "order" explain the difference between permutations and combinations.


3. Given a data set with a symmetric frequency distribution, a mean of 63, and a standard deviation of 3.
a. Approximately 68.3% of the data points are between 57 and 69.
b. Approximately 68.3% of the data points are between 60 and 66.
c. Approximately 95.4% of the data points are between 54 and 72.
d. Approximately 95.4% of the data points are between 60 and 66.

4. Give an example of a stratified sample

5. Give an example of a random sample.

2007-08-18 18:06:02 · 4 answers · asked by Gael C 1

1. e^ln3x=11
2. e^x+4/ e^4=1
3. (e^4)3x=e^4e^3x
4. e(2lnx-ln(x^2-3x+1)=1
5. e^2x-2 * e(x+2) + e^4 = 0

2007-08-18 18:05:15 · 3 answers · asked by Anonymous

2007-08-18 17:48:52 · 9 answers · asked by C00L GαL 2

"x(x+2)+(x+2)"????
is it (x+2) (x) or something plzzz help

2007-08-18 17:36:51 · 10 answers · asked by BoboboboboO! 1

if 1.15 = one and a quarter hours
and 1.5 = one and a half hours
and 1.75 = one and three quarters hours
How do i figure out what's in between those fractions I realize that theres 15/15ths in a quarter so it there was a value of 1hr and 25 minutes how would i write that in the above terms.

I am sooo bad at math. Thanks!

2007-08-18 17:12:04 · 5 answers · asked by shadow_3211 2

There's this one problem on the textbook that I don't understand...Thanks!
Suppose a given triangle is directly congruent to its mirror image. We can be sure that this triangle is? 1. Equilateral 2. Isosceles 3. Acute 4. Obtuse. And could u plz explain the answer too? Thanks!

2007-08-18 16:58:16 · 7 answers · asked by Anonymous

3x-2y=6

2007-08-18 16:44:07 · 5 answers · asked by Anonymous

With 9^2=81, the 9^2 can be expanded to 9*9.
With 9^3=729, the 9^3 can be expanded to 9*9*9.

So they are very obvious and easy to understand.

But for something like this:
9^0.5
9^1/3
Although I can still understand the first one is taking the square root of 9, and the second one is taking the cube root of 9. I can't manually expand them easily and I have to use the calculator. Taking 9^0.7 as an example, I can neither treat as the sqaure root nor cube root of 9, so it's even more difficult to understand.

I want to expand them so that they are easier to understand, is this possible?

Thank you.

2007-08-18 16:27:51 · 3 answers · asked by I need answers 1

sharon is 48 and sam is 3 yrs old in how many yrs. sharon will be 4 times as old as sam

2007-08-18 16:13:08 · 12 answers · asked by bagsik 1

$1040 invested for 20 years at 15% p.a. compounded half yearly...could u guys tell me how to transsfer yearly to monthly...and etc..

2007-08-18 16:02:27 · 1 answers · asked by nevin... 1

(-243)^1/5

i just forgot what youre supposed to do if its a negative number...

2007-08-18 15:42:05 · 4 answers · asked by Anonymous

Martha wants to buy a digital camera from her three-month savings. To do this she needs to maintain an average saving of $300 in each month. She saves $450 in the first month and $200 in the second month. Find the amount she should save in the third month to buy a digital camera at the end of three months

2007-08-18 15:17:15 · 8 answers · asked by shellyeph 1

Find k when x = 6, z = - 2, y = - 15

2007-08-18 15:06:58 · 7 answers · asked by Dudemanbro 1

f(x) = 6x + 1, g(x) = 8x + 7

2007-08-18 15:06:04 · 3 answers · asked by Dudemanbro 1

9x -2y = 28
y= -3x + 1

2007-08-18 15:05:15 · 6 answers · asked by Dudemanbro 1

5x - 3y = -34
2x + 7y = -30

2007-08-18 15:02:13 · 9 answers · asked by Anonymous

y=2x^2 -4x +3

2007-08-18 14:57:04 · 2 answers · asked by Anonymous

A wall of a building is to be braced by a beam that must rest on the ground and pass over a vertical wall 10 ft high that is 8 ft from the building. Find the lengh L of the shortest beam that can be used.

2007-08-18 14:41:18 · 11 answers · asked by ori_culumn 1

a=1/2h (B+b) (for b)

2007-08-18 14:40:46 · 2 answers · asked by eialeen h 1

how do u find the volume of a parabola for example like x=y^2
i dont understand how the formula is meant to b used

2007-08-18 14:40:07 · 1 answers · asked by Anonymous