Science & Mathematics - 6 December 2007

I am serious. I have never fully understood this because. ... Standing on land and saying it is below the level of the sea just confuses me. If you don't know what you are talking about, please don't answer...thank you

2007-12-06 17:34:29 · 9 answers · asked by Jacks036 5 in Earth Sciences & Geology

Question:
The lines AB and CD are parallel to each other. Find the value of a in each of the cases.
(a) A (2, 3), B (4, 5) and C (4, 3), D (2, a)
(b) A (1, 2), B (3, 4) and C (-3, -2), D (a, 6)
(c) A (-1, -2), B (-5, -4) and C (1, 7), D (3, a)
(d) A (1, 1), B (a, 3) and C (-1, 4), D (2, 7)
^ Those are some of the questions I need help on.

Could you please give the fomulae and the explain the working out too?

2007-12-06 17:34:25 · 3 answers · asked by Anonymous in Mathematics

Just answer

2007-12-06 17:31:10 · 11 answers · asked by Anonymous in Zoology

the questions is
-----
For which positive integer n will the equestions
(1) x1+x2+x3+...+x19 = n , and
(2) y1+y2+y3+....+x64 = n
have the same number of positive integer solutions?
----------------------------------
since C(n+k-1,k) = #ofsolutions,
i got
(19+n-1)!/19!(n-1)!=(64+n-1)!/64!(n-1)!

but i can't get anywhere then, was my approach wrong?
i hope somebody could help me,,,,at least some tip or hint.

2007-12-06 17:25:48 · 1 answers · asked by Anonymous in Mathematics

solve cos(x)=x
anyone who dos this step by step is a genius!!

2007-12-06 17:21:33 · 4 answers · asked by MTG G 2 in Mathematics

x
8 =1

2007-12-06 17:18:22 · 2 answers · asked by Alexis O 1 in Mathematics

(1+2x)=8
2

2007-12-06 17:17:07 · 5 answers · asked by Alexis O 1 in Mathematics

Hello!
I have found out the prices for the Silva workshop which costs a fortune. Now I wanted to know if any of you had tried the home study course you can buy on the official Silva website and how did you get on with it? Is it reliable are the effects the same?

2007-12-06 17:16:20 · 4 answers · asked by Pandora 1 in Parapsychology

5 zopliclone...7.5 mg

2007-12-06 17:14:51 · 2 answers · asked by H V 1 in Medicine

A boat leaves a dock at 2:00 P.M. and travels due south at a speed of 10 km/h. Another boat has been heading due east at 20 km/h and reaches the same dock at 3:00 P.M. How many minutes past 2:00 P.M. were the boats closest together?

A farmer with 780 ft of fencing wants to enclose a rectangular area and then divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total area of the four pens.

Area = ft^2

2007-12-06 17:14:39 · 1 answers · asked by iDontKnow 1 in Mathematics

log x (4/5)=1

2007-12-06 17:14:10 · 2 answers · asked by Alexis O 1 in Mathematics

2007-12-06 17:13:01 · 6 answers · asked by Anonymous in Engineering

What happens when you have this?

A empty set with a union of (4, 5, 6)

So, it looks like: (empty set) U (4, 5, 6)

Is this answer to this an empty set or nothing? or something else

2007-12-06 17:11:11 · 8 answers · asked by thunderbomb90 3 in Mathematics

Find the point on the line that is closest to the point . (1,2)

Find the dimensions of the rectangle of largest area that has its base on the x-axis and its other two vertices above the x-axis and lying on the parabola y=4-x^2 . List the dimensions in non-decreasing order

last question : )
Find the dimensions of the largest rectangle that can be inscribed in a right triangle with legs of length 3 cm and 4 cm if two sides of the rectangle lie along the legs. List the dimensions in non-decreasing order.

2007-12-06 17:08:41 · 1 answers · asked by iDontKnow 1 in Mathematics

I know how to isolate x, but i'm not sure how to isolate x if t's a fraction?: 4x = 8/4

Also, how do i solve this? 40 + ⅝?

Another thing, how do i turn a radical into a fraction? 40⅝

I appreciate your help!

2007-12-06 17:07:46 · 9 answers · asked by Mzee 3 in Mathematics

i saw this picture and i always hear people say it but i don't know what it is.

2007-12-06 17:05:00 · 3 answers · asked by Anonymous in Medicine

math Q:all the whole numbers with a digit of 2 are written in increasing order. The list begins 2, 20, 21, 22 .... Find the 1000th digit thus written. The answers you can choose from are A)6, B)7 C)8 D)9.. explainn your answer.. good luck.!

2007-12-06 17:04:38 · 5 answers · asked by 27ysq 4 in Mathematics

2007-12-06 17:03:25 · 2 answers · asked by dreamweaver 4 in Geography

-6

2007-12-06 17:02:39 · 7 answers · asked by Ashley 1 in Mathematics

the question is pretty complicated

2007-12-06 16:58:36 · 2 answers · asked by alkesh831 2 in Botany

I need to use the function q^2+n/2q where n is the number that I want to estimate the square root of. Apparently this was Newton's method of finding square roots, but I have no idea what to input for a q value in my excel sheet. Any idea?

2007-12-06 16:58:21 · 3 answers · asked by ifm2161 2 in Mathematics

The question is, "A student left some alkyl halides (RCl and RBr) in an open container for several minutes. What happened to the composition of the halide mixture during that time?" Not quite sure how to figure this one out...any help will be greatly appreciated!

2007-12-06 16:57:34 · 1 answers · asked by Heather Leigh 1 in Chemistry

Given f(x)=3x+4

1. Is f(x) a function? Why or why not?

2. Find f -1(x).

Is f -1(x) a function? Why or why not?

2007-12-06 16:53:41 · 5 answers · asked by Ashley 1 in Mathematics

2007-12-06 16:50:16 · 23 answers · asked by Jack M 1 in Mathematics

2007-12-06 16:50:04 · 12 answers · asked by Anonymous in Medicine

thanks.

2007-12-06 16:49:08 · 2 answers · asked by lisazhang112004 1 in Chemistry

A 2.0-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 250 N/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.6 m/s and first comes to rest at a displacement of 0.20 m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?

2007-12-06 16:38:59 · 4 answers · asked by roncho 4 in Physics

1) Write the complex number (sqrt(3)/2)-(1/2i) in the form re^i(theta).

2) Write the complex number 2e^(-pi/4)i in the form a + bi.

3) Write the complex number e^(3+4i)t in the form a(t)+b(t)i.

2007-12-06 16:38:12 · 3 answers · asked by Victor 1 in Mathematics

determine all of the values of x such that
sin^5x + cos^5x = 1 and 0 ≤ x ≤ π/2

2007-12-06 16:37:01 · 1 answers · asked by Anonymous in Mathematics

Find the outward flux of the vector field F = (x^3, y^3,z^2) across the surface of the region that is enclosed by the circular cylinder x^2 + y^2 = 36 and the planes z = 0 and z = 2.

Don't know how to do this

2007-12-06 16:36:59 · 1 answers · asked by dizayfashizay 2 in Mathematics