Science & Mathematics - 12 October 2006

i'm just wandering if the universe really is four-dimensional...

2006-10-12 20:42:23 · 9 answers · asked by dolly 1 in Astronomy & Space

For the systems of linear equations in questions 1-3
-Determine how many solutions exist
-Use either elimination or substitution to find the solutions (if any)
-Labeling the x-intercepts, y-intercepts, and points of intersection

1. y = 2x + 3 and y = -x - 4

2. 2x + 3y = 8 and 3x + 2y = 7

3. x + y = 3 and y = x + 3

4. A university bookstore recently sold a wirebound graph-paper notebook for $2.50, and a college-ruled notebook for $2.30. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of $118.60. How many of each type were sold?

5. A shopper buys three oranges and five lemons for $10.26, while a second shopper buys four lemons and six oranges for $11.16. What is the price of each fruit?

6. In a triangle, the sum of the interior angles is 180 degrees. If angle A is three times as large as angle B, and angles B and C sum to 90 degrees, what is the measure of each angle?

2006-10-12 20:41:18 · 5 answers · asked by pmgstudios 1 in Mathematics

i need to know if you can use it as evidence of it breathing or exchanging gases. can you tell me the answer for a fourth grader. it is like this moisture from leaves is produced by transpiration why can you use the presence of moisture as evidence that a plant is exchanging gases or breathing.

2006-10-12 20:38:29 · 4 answers · asked by Anonymous in Botany

can u giv me egs of its compounds and give its structure?

2006-10-12 20:35:55 · 7 answers · asked by deeps 1 in Chemistry

2006-10-12 20:30:42 · 18 answers · asked by Anonymous in Geography

It had a black body, about 4 green stripes going from top to botom, a large white dot(lower back) with a red cross(maybe dot, it was small marking) in the middle of it and an orange dot(on it's butt) below the white one. It was a little bigger then a nickle including it's legs. I saw it on a door jam in california, the building had trees and dry grass all around it.

2006-10-12 20:26:10 · 7 answers · asked by Randomguy1 2 in Zoology

2006-10-12 20:25:07 · 4 answers · asked by Jeramie L 2 in Astronomy & Space

2006-10-12 20:23:50 · 6 answers · asked by zpandiannn 1 in Physics

If you cut a rod shaped magnet in across its width (not lengthwise), will it still have opposite poles of attraction?

2006-10-12 20:13:56 · 14 answers · asked by G 1 in Physics

solve.

-5√8x-4 +3 = 18

how do i find the answer to this one? what are the steps?
the 8x-4 are under the square root, not the +3.

2006-10-12 20:12:25 · 10 answers · asked by Sharon 1 in Mathematics

Hi and good morning, or is it nightime where you are, another fine day with a beautiful sun just rising, and thank God it's Friday...wow how quickly the weeks roll by......anyway is it morning, or night where you are.

2006-10-12 20:07:33 · 10 answers · asked by Anonymous in Earth Sciences & Geology

2006-10-12 20:07:00 · 16 answers · asked by Anonymous in Biology

This happenned last night. I screamed out of fear and it disappeared. After this happenned I couldn't sleep but somehow I started getting my childhood memories. Strange!!!! Any one know what this could be? Any one experience such things?

2006-10-12 20:06:46 · 10 answers · asked by Ranjith 1 in Other - Science

Frequency distribution table (in $'000)
Lower LimitUpper LimitCountCumulative Count%Cumulative %
2030337.50 7.50
31406915.00 22.50
415081720.00 42.50
516072417.50 60.00
617073117.50 77.50
718053612.50 90.00
81901372.50 92.50
911003407.50 100.00

Can I know how to compute the variace and standard deviation from the above data? What is the formula? Thanks in advance.

2006-10-12 20:05:58 · 1 answers · asked by StarGirl 2 in Mathematics

suppose limit a_n = A
prove that limit (a_n+1 - a_n) = 0

many thanks

2006-10-12 20:04:04 · 4 answers · asked by superfly 1 in Mathematics

2006-10-12 20:03:50 · 21 answers · asked by Anonymous in Astronomy & Space

2006-10-12 20:03:41 · 3 answers · asked by Anonymous in Zoology

2006-10-12 20:02:09 · 13 answers · asked by Anonymous in Astronomy & Space

2006-10-12 20:01:08 · 11 answers · asked by yanick b 1 in Engineering

2006-10-12 20:01:04 · 10 answers · asked by Moo 1 in Other - Science

x_1 and y_1 are given, x_1>y_1>0

x_n+1 = (x_n+y_n)/2
y_n+1 = sqrt(x_n*y_n)

a)proof y_n< y_n+1
b)proof y_1 < x_n+1 < x_n

c)proof 0<(x_n+1) - (y_n+1)< (x_1 - y_1)2^n

d)explain why {x_n} and {y_n} are convergent and have the same limit


anything will help
Thank you all of u guys

2006-10-12 19:59:32 · 1 answers · asked by superfly 1 in Mathematics

2006-10-12 19:58:16 · 3 answers · asked by kapil g 2 in Engineering

2006-10-12 19:43:37 · 17 answers · asked by Anonymous in Engineering

2006-10-12 19:43:06 · 3 answers · asked by Hossein 1 in Medicine

I'm a second year Electrical engineering student, do you think it worth to graduate one year later and go to co-op?

2006-10-12 19:38:50 · 7 answers · asked by Princess Jasmine 2 in Engineering

what are the planets that are existig today?

2006-10-12 19:36:46 · 8 answers · asked by Anonymous in Astronomy & Space

Factor completely

-3t^3 + r^2-6r

so whats the difference?
Factor each polynomial completely

2x ^2 – x – 10

10a^2 + ab –2b^2

2006-10-12 19:36:37 · 4 answers · asked by SCHNITZEL 1 in Mathematics

Answer should be regarding oil exploration

2006-10-12 19:32:58 · 1 answers · asked by swapnafp2307 1 in Earth Sciences & Geology

Factor completely

-3t^3 + r^2-6r

2006-10-12 19:30:54 · 6 answers · asked by Anonymous in Mathematics

2006-10-12 19:27:53 · 2 answers · asked by nogs 1 in Chemistry