Mathematics - 25 November 2007

The line L through the origin is normal to the plane: 2x-y-z=4. Find the point in which L meets the plane x+y-2z=2.

2007-11-25 23:50:57 · 2 answers · asked by Anonymous

2007-11-25 22:17:47 · 4 answers · asked by icecweam 1

2007-11-25 22:14:05 · 4 answers · asked by icecweam 1

Show that for all values of m, the line y=mx-3m^2 touches the parabola x^2=12y

please help me!
thanks!

2007-11-25 22:10:36 · 3 answers · asked by Anonymous

and one drink

2007-11-25 21:53:06 · 14 answers · asked by Arun 1

OK, when a basketball team charges $4 per ticket, avg. attendance is 400 people. For each 20 cent decrease in ticket price, avg. attendance increases by 40 people. What should the ticket price be to maximize revenue?

THANKS SO MUCH!

2007-11-25 21:45:43 · 6 answers · asked by Anonymous

The algebra machine gives me 3 when I put in 2. When I put in 3 it gives me 5 and it gives me 13 when I put in 7?
Let x represent input number and y represent the resulting number, give the rule for this algebra machine?

This is for a year 7 student

2007-11-25 21:32:36 · 3 answers · asked by Anonymous

Can somebody please give me an extremely simple explanation to how I can solve the 3X3X3 rubick's cube? (I'm not that good at maths). Thank you :)

2007-11-25 21:21:49 · 9 answers · asked by Anonymous

If a+b+c=180 (degrees)
Prove that
sin^3 a+sin^3 b+ sin^3 c=3cos(a/2)cos(b/2)cos(c/2)+ cos(3a/2)cos(3b/2)cos(3c/2)

Please show me each step of your working.

Thank you very much in advance.

P.S.this is a really brain-storming problem ;-)

2007-11-25 21:17:54 · 4 answers · asked by Anonymous

ABCD is a trapezoid where AB and CD are the legs while AD is the longest base and BC is the shortest base. XY is parallel to AD, BX = 1/4AB, BC=10 and AD=20. Find XY.





Pls. answer it i need it now pls. show your solution pls. pls. i'm begging you pls. pls. pls. pls. i'm so very begging you pls.

2007-11-25 20:26:58 · 3 answers · asked by Anonymous

1) 175% of what number is 21?

2) 28 is 87 1/2% of what number?

3) What is 26% of 81?

4) 37% of 55?

5) Find the Percent of increase: original price $4..New price $4.50?

6) Find the Percent of Decrease: Temp at noon 24F..Temp now 8F?

7) Find the percent of decrease: Original price $27..New $18?

2007-11-25 20:12:18 · 7 answers · asked by tommygurl48670 2

We have built our kids a sandpit and need to know how much sand to put in it.asically I have forgotten how to work out the volume of a shape. The sandpit dimentions are:
2.3m long x 2.3 m wide x .3 metres deep.
Can you refresshmy brain on this so simple maths problems.
Thanks

2007-11-25 20:09:56 · 9 answers · asked by Anonymous

I need help! How do I multpily this...

√3 x √5

or simplify this by factoring?!

√x^7

2007-11-25 20:09:16 · 5 answers · asked by Babygurl91 1

How do I use a radical notation to rewrite this expression?

49 1/2

2007-11-25 20:02:32 · 3 answers · asked by Babygurl91 1

ABCD is a trapezoid where AB and CD are the legs while AD is the longest base and BC is the shortest base. XY is parallel to AD, BX = 1/4AB. Find XY.





Pls. answer it i need it now pls. show your solution pls. pls. i'm begging you pls. pls. pls. pls. i'm so very begging you pls.

2007-11-25 19:49:28 · 2 answers · asked by Anonymous

2007-11-25 19:48:42 · 3 answers · asked by Anonymous

Please show working out. I've been trying to do this for so long but just can't seem to get it. I know the answer is x=4 by just looking at the question.

Thanks

2007-11-25 19:40:57 · 5 answers · asked by Anonymous

I graded my students' listening test, but all the scores are too close to each other. How do I spread them out proportionally to accurately reflect the difference between the better and worse students? Please give me the math I need to use. Thank you.

2007-11-25 19:36:16 · 3 answers · asked by GenshiYagyu 2

theta is between 0 and 180 degrees

2007-11-25 19:29:57 · 5 answers · asked by nat king 1

In exam hall pls!

2007-11-25 19:23:32 · 20 answers · asked by Mally 2

Find its radius and altitude.

2007-11-25 19:16:36 · 3 answers · asked by Anonymous

2007-11-25 19:13:56 · 9 answers · asked by Anonymous

xxx
*xx
= xxxx
+xxxx0
=xxxxx

Using only 2,3,5,7 what is the final answer

2007-11-25 18:50:47 · 1 answers · asked by Anonymous

http://s141.photobucket.com/albums/r77/rocketllamafootie/?action=view¤t=combines.jpg

2007-11-25 18:34:21 · 1 answers · asked by Anonymous

The pages in a book are numbered starting with 1. The book has 250 pages. How many digits did the printer use in numbering the pages of the book?

a) 640
b) 642
c) 320
d) 321

2007-11-25 18:29:00 · 8 answers · asked by tommygurl48670 2

I think I'm gonna go nuts. I'm trying to integrate this but always getting the wrong answer. I've done it 5 times already. Ok here it is:

Double-integrate this from 0 to 0.4 (for both x and y):

2/5(2x+3y)dxdy

The answer's supposed to be 0.64 but I keep getting 0.128. If you got the right answer, can you please walk me through every step of the integration process in detail? I'll give best answer! :)

2007-11-25 18:24:43 · 2 answers · asked by Areeb B 1

It is circumscribed about a right circular cylinder of base radius 6 cm. and altitude 14 cm. Find the lateral area of the cone.

2007-11-25 18:20:45 · 1 answers · asked by exilimo 1

It was surmounted by a right circular cone of the same diameter and altitude 3 m. Find the total volume of the silo.

2007-11-25 18:18:00 · 1 answers · asked by exilimo 1

please sumone help me

2007-11-25 18:16:36 · 7 answers · asked by Anonymous

Easily and smoothly.I have to take exam tommorow

2007-11-25 18:12:33 · 1 answers · asked by Anonymous