Science & Mathematics - 22 July 2007

2007-07-22 23:51:35 · 11 answers · asked by dnyaneshwar b 1 in Botany

A triangle has the following properties:
1) It is scalene
2) It does not contain a right angle.
3) It has interger length sides
4) Its area is an integer.
Find the triangle with these properties which has the least perimeter.

[ Use Heron's Formula for the area of a triangle with sides a, b, c: where area = square root of s(s-a)(s-b)(s-c) where 's' is the semi perimeter (a+b+c)/2 ]



Any working would be greatly apprecicated. It's due tomoro, HELP PLEASE!!! (i shall giv thanks and best answer!!!:D:D:D)

2007-07-22 23:50:19 · 2 answers · asked by Anonymous in Mathematics

2007-07-22 23:43:54 · 4 answers · asked by John G 2 in Geography

1a) Solve the equation 1 + 2/x = 3/2.

1b) Given that a = square root b + 2 / c,
express b in terms of a and c.

1c) Express the following as a single fraction, in its simplest form,

(i) K^2 - k / K^2 - 1.
(ii) 1 / x - 3 - 2 / 3 - x.

Solve these questions correct with detailed workings and earn points!!! :)
The lucky person with the best answer will be voted as the "BEST ANSWER".
Voting of the best answer will take place after 4hours!!.

2007-07-22 23:29:59 · 5 answers · asked by Anonymous in Mathematics

I don't understand this... why do i use (4/2)^2 in the next problem
Identifying the Vertex of a Quadratic Function
example
Describe the graph of f(x)= 2x^2+8x+7 and identify the vertex.
solution
write the quadratic function in standard form by completing the spare. Recall that the first step is to factor out any coefficient of x^2 that is not 1
f(x)=2x^2+8x+7
f(x)=2(x^2+4x)+7
f(x)=2(x^2 + 4x + 4 - 4) +7 ----------------------->because b=4, add and subtract (4/2)^2
f(x)=2(x^2 + 4x +4) - 2(4)+7
= 2(x+2)^2-1
From standard form, you can see that the graph of f is a parabola that opens upward with vertex (-2,-1)

Identify the vertex and x-intercepts(s).
#1
f(x)=x^2 - x + 5/4

I tried to factor it... (x- ) (x- ) but I could not figure out what times what is 5/4
the answer is the following but it want to know how to do this.
Vertex: (1/2, 20)
x-intercept: none
and a graph

# 2
f(x) = -x^2+2x+5

2007-07-22 23:09:02 · 7 answers · asked by simpukka 1 in Mathematics

do they exist? and where do they lived??

2007-07-22 23:08:59 · 16 answers · asked by rR 1 in Astronomy & Space

is there any people in outer space i mean...they live like us....like peoples......or new world out there??

2007-07-22 23:04:37 · 5 answers · asked by rR 1 in Astronomy & Space

Is there anything like this on the internet? A conversion CHART, not an online converter.

2007-07-22 23:01:06 · 3 answers · asked by Michael 2 in Chemistry

2007-07-22 23:00:49 · 5 answers · asked by shaz_gulz85 1 in Earth Sciences & Geology

Why not? Other giant sea-mammals like sea lions do.

2007-07-22 22:57:01 · 5 answers · asked by Zowzooma, the Angry Deity 2 in Zoology

Any ideas why it is the way it is? With centigrade, it seems reasonable that someone would have chosen 2 significant temperatures (such as freezing point and boiling point of water) and assign nice round numbers to them. It's intuitive and common sense. Fahrenheit, however, is different. It seems to lack the simplicity, intuitiveness, and common sense of centigrade.

So, my question: why is the Fahrenheit scale the way it is? How is it derived?

2007-07-22 22:47:56 · 7 answers · asked by Nick J 4 in Other - Science

i whant circuit diagram to series programmer for avr and book for avr c language

2007-07-22 22:39:10 · 3 answers · asked by eman 1 in Engineering

Magnesium burns brightly in oxygen to give magnesium oxide, which contains the ions mg2+ and 02- . The formation of both these ions from their elements is strongly endothermic. Why, therefore, should magnesium combine with oxygen?

2007-07-22 22:36:29 · 3 answers · asked by leera 1 in Chemistry

if so then 1 foot is not exactly 12 inches. i read in a maths book that 30cm = 1 foot then why is 180cm not 6ft ??
180 is said to be 5'11''

2007-07-22 22:33:42 · 14 answers · asked by Anonymous in Mathematics

2007-07-22 22:33:24 · 4 answers · asked by Davril Evans 1 in Mathematics

I had never heard of them until I did some research recently and feel that they have a pretty solid design. They would likely be more efficient than the typical two stroke while having more HP than a four stroke with similar displacement. Why has this design not been used in conventional applications such as lawnmowers or auto engines?

2007-07-22 22:25:04 · 5 answers · asked by Anonymous in Engineering

Or is it that doctors who prescribe drugs can prescribe any kind of drug? For example, can a heart surgeon suddenly prescribe an antipsychotic or is he not authorized to do that?

2007-07-22 22:10:10 · 7 answers · asked by na n 3 in Medicine

2007-07-22 22:00:11 · 4 answers · asked by capiz 1 in Engineering

how preasure can low the temperature?

2007-07-22 21:56:51 · 3 answers · asked by _Me_ 1 in Earth Sciences & Geology

I live in Arkansas, and these plants are out in my field. There is a patch of them. It doesn't really look natural or look like they are wild. It looks like someone planted them at one time or another. Maybe it could be a clue to an old homesite? I want to look for a well but it is summer and everything is so grown up right now. I think I will metal detect in the winter to learn more about this spot. Also there are rocks where the plants are growing... Anyone know what this means?

2007-07-22 21:49:26 · 9 answers · asked by Anonymous in Botany

1. A timber fence is to be built on sloping land, with the shortest piece of timber 1.2m and the longest 1.8m. There are 61 pieces of timber in the fence.
a) what is the difference in height between each piece of timber?
b) What length of timber is needed for the fence altogether?

2007-07-22 21:44:18 · 3 answers · asked by loza 2 in Mathematics

please explain in detail

2007-07-22 21:36:33 · 3 answers · asked by dark_ak 1 in Chemistry

the atmostphere?

2007-07-22 21:35:19 · 8 answers · asked by angeldust03 1 in Earth Sciences & Geology

<= means smaller or equal

Thank you.

2007-07-22 21:27:10 · 5 answers · asked by Amir 1 in Mathematics

My freind, a Jehovas witness, says this is it, God has had enough and is flooding the world again, what do you think?

2007-07-22 21:24:56 · 16 answers · asked by big d 1 in Weather

I have been texted by one of my friends that on July 27. 2007, Pluto will be seen as big as the moon. Is this true or he is only joking around? thanks!!!

2007-07-22 21:24:28 · 7 answers · asked by Anonymous in Astronomy & Space

<= means smaller or equal

Thank you.

2007-07-22 21:09:12 · 4 answers · asked by Amir 1 in Mathematics

And if it does, then how is it measured?

2007-07-22 21:05:29 · 6 answers · asked by Anonymous in Physics

if u had to describe a sun rise to a person who has never seen one, how would u do it?

2007-07-22 20:51:22 · 5 answers · asked by latina20 1 in Astronomy & Space

http://i126.photobucket.com/albums/p89/shannan77/7-20-07001.jpg

2007-07-22 20:44:02 · 5 answers · asked by snickelfritz 4 in Zoology