Mathematics - 20 August 2007

please help! I have zero idea of how to do this

4x-2y+3z=14
2x+y-5x=5
-3x-2y+5z=-7

2007-08-20 12:50:32 · 3 answers · asked by Talh 1

Check this Y!A question:

http://answers.yahoo.com/question/index;_ylt=AhK9dd963eo7M_r0Jlzq6ML4xQt.?qid=20070820153043AAN8WHT

For positive x, how many inflexion points does this function have, and where? An inflexion point is when a function undergoes a change of curvature from positive to negative or vice-versa. Approximate answers accepted.

2007-08-20 12:01:28 · 4 answers · asked by Scythian1950 7

e^(3x) = 5

2007-08-20 11:53:05 · 5 answers · asked by lucy_loo_boo 1

2007-08-20 11:52:44 · 6 answers · asked by amrita 2

1) rewrite a a fraction: .875
2) Rewrite as a decimal: 5 over 8
3) Rewrite as a fraction: 74%
4) Rewrite as a percent: .8
5)Rewrite as a percent: 7 over 20
6) Rewrite as a fraction: .85

2007-08-20 11:48:20 · 7 answers · asked by ~Val~ 4

| x - 2 |

How do I solve for x? Wouldn't there be tons of answers? I need a bit of review.

2007-08-20 11:40:12 · 3 answers · asked by Anonymous

a. 10n
b. 10+n
c. n-10
d. 10-n

2007-08-20 11:37:19 · 7 answers · asked by amrita 2

I've lost my calculator operation manual for the TI-92 Plus calculator. Does anyone know of a good URL for this calcuator's functions and operations? I can get the device to do all of the basic arithmetic operations and thngs like LOG and Ln functions. However, with Trig. operations and transendental functions, all I get is the equation organized and presented in symbolic form. Even when I make the equation equal to some variable, it doesn't give a "result" answer. I feel like there is one more step in the operation that I need to do but I have no idea what that step is.

If anyone has experience with this calculator, maybe you can tell me what it is that I'm doing wrong. That would be a really big help.

Thanks in advance.

2007-08-20 11:34:07 · 1 answers · asked by Bob D1 7

X to the 2 power + 7/8 - x/8

2007-08-20 11:23:19 · 10 answers · asked by Unnamed 3

2007-08-20 11:19:16 · 20 answers · asked by chabala k 1

4265 times the square root of 65 divided by 12 times 3/100

2007-08-20 11:19:06 · 3 answers · asked by lumi 4

2007-08-20 11:17:31 · 7 answers · asked by alexcanales1 1

What are all the prime numbers from 50-75 first one to answer right gets the points!

2007-08-20 11:02:06 · 3 answers · asked by Anonymous

the equation:

f(x)= (x^2 + x - 2) / (x^2 - x - 6)
to get the VA i set the denominator equal to zero...

x^2 - x - 6 = 0
(x -3) ( x +2) = 0
3, -2.
so there is a VA at 3 and a VA at -2. but when i graphed it on my calculator...the graph went through the VA. is this becasue there is a hole at -2?

2007-08-20 11:01:08 · 3 answers · asked by yeahxitsxsarah 2

Mrs. Jones was 24 years old when Sally was born. In three years, the sum of their ages will be 68 years. How old is each now?

*Don't worry about solving the problem if you don't want to; I just don't know how to do it so I need an equation for it.

2007-08-20 10:35:38 · 6 answers · asked by Steph 1

Wheel’s Bicycle shop advertised a bicycle for 15% off for a savings of $36. The bicycle did not sell so it was offered at a new 20% discount off the sale price.

(1) What did the bicycle sell for regularly?
(2) What is the amount of the new discount?

2007-08-20 10:29:10 · 2 answers · asked by Chris 1

2007-08-20 10:26:17 · 2 answers · asked by Beau B 1

12+4x=20

A.) Subtract 4x from both sides, then divide by 4.

B.) Subtract 12 from 20 then divide the answer by 4.

C.) Add 12 to 20 then multiply the answer by 4.

D.) Add 4x to both sides, then divide by 4.

2007-08-20 10:23:37 · 15 answers · asked by angel 1

In Circle O, the midpoint of segment GH is point O. AB = 4x - 2 and CD = 2x + 12.

Part a) Find the value of x.
Part b) Find the value of AB and CD.
Part c) If GH = 32, find the length of the radius of the circle. Write your answer rounded to the nearest hundredth.
You must show all work for each part to receive full credit.

Picture included: http://img106.imageshack.us/img106/6045/math2ur5.jpg

2007-08-20 10:20:54 · 2 answers · asked by zerokun4 1

My kid asked me what the opposite of zero is, does anyone know?
Like the opposite of +1 is a -1
but what can the opposite of 0 be? It's not a negative or a positive.

2007-08-20 10:20:31 · 8 answers · asked by Anonymous

2007-08-20 10:13:40 · 10 answers · asked by lilou 1

2(3x-2)+4(x+1)=5x+30
solve for x

i get
2(3x-2)+4(x+1)=5x+30
6x - 4 + 4x + 4 = 5x+ 30
There is a -4 and a +4 on the same side of the equation now, with no brackets, they therefore cancel (-4 + 4 = 0)
6x + 4x = 5x+ 30
10x = 5x +30
10x-5x = 30
5x=30
X=6

thanks ever so much

2007-08-20 10:10:44 · 30 answers · asked by peppypop 2

I want to get good marks this year, and one of my courses includes Calculus. Is it as hard as I've heard throughout my academic career? I mean, Calculus is synonomous with really hard or impossible work.

I'm not a math genius or a ridiculously smart person, but I'm fairly good at math, and can catch on to concepts well enough. How will I do in Calculus?

Also, is it fun? I've heard it's fun if you like math, and I like math.

2007-08-20 10:00:47 · 10 answers · asked by Anonymous

3x^2-18x+25 ?

please help me! i would really appreciate it!

2007-08-20 09:55:21 · 4 answers · asked by Anonymous

2007-08-20 09:43:36 · 4 answers · asked by yeahxitsxsarah 2

What does the line over a number mean? example: 2.23 and pretend there is a line over the last two numbers.

2007-08-20 09:41:02 · 9 answers · asked by Jeff 1

(x=3)/8=x/2

(-2/3)x>12

5x<-7x-36

2007-08-20 09:39:33 · 5 answers · asked by Lori 1

Convert each of the following rational numbers to the form a/b, where a and b are integers and b ≠0.
a) 0.27
b) 3.104
c) 0.24

2007-08-20 09:39:32 · 5 answers · asked by Jeff 1

x - y = 3
2x - y = -1

is this right
2x - y = 2

then what? lol

----------------------------

2x + 4y = 10
3x - 2y = -9

2007-08-20 09:36:33 · 4 answers · asked by Ruth 2

Use the tagging and recapturing technique to estimate the number of fish in a pond. Suppose 140 fish were captured, tagged, and released. Then 50 fish were recaptured and among them 20 were found to be tagged. Estimate the number of fish in the lake.

2007-08-20 09:33:18 · 6 answers · asked by Anonymous