Mathematics - 23 July 2007

(x-2)(x-2)
=x^2-2x-2x-4
= x^2+x-4 (answer)


If it isn't what did I do wrong?

2007-07-23 06:45:05 · 10 answers · asked by gloriousnina 2

In my current texbook, they don't tell what to do in this instance.
e^-3x

2007-07-23 06:44:49 · 5 answers · asked by Good Boy 1

2007-07-23 06:44:13 · 8 answers · asked by Anonymous

Let X = {1, 2, 3, 4}, Y = {2, 3, 4, 5, 6}, Z = {1, 2, 3}.
Whats a function f: X -> Y that is one-to-one but not onto and whats a function for X -> Y thats neither.

2007-07-23 06:43:45 · 2 answers · asked by Tim4545 1

Our company's new "Lite" yogurt is supposed to contain only 1.5 grams of fat. The FDA monitors these advertising claims for accuracy. If they can prove, at the 10% significance level that our product contains more fat than advertised, then we will be subject to fines and product recall. A sample of 90 packages yielded an average of 1.54 grams of fat, with a standard deviation of 0.16. Perform the appropriate hypothesis test to see if our product violates FDA advertising standards.

Write the appropriate null and alternative hypotheses.

H0: _______________
H1: _______________


Write the rejection rule for the null hypothesis.


Calculate the appropriate test statistic.


Write a conclusion. Do we reject or fail to reject the null hypothesis? What do we believe about the fat content of the yogurt?


Find the p-value.

2007-07-23 06:36:14 · 4 answers · asked by Anonymous

Please help me my teahcer didn't go over this and my final is on Thursday!! Please everyone come to my rescue!!!
Use a double- angle formula to rewrite:

2 sin 12 cos 12

cos^2 6a-sin^26a

thanks again

2007-07-23 06:32:09 · 3 answers · asked by In Flames I Lay Dying 3

(7) ^1.2y^2-6y-13(7)^1/2=0

I need help with this and justifying the solutions and why.

2007-07-23 06:26:54 · 1 answers · asked by littlesoutherner12 1

2007-07-23 06:26:13 · 7 answers · asked by marie c 1

I am wondering what comes after division in teaching math? I was thinking of going into pre-algebra, but my cousin doesn't know fractions, and I do not want to teach him pre algebra untill I know that he knows everything needed to go into pre algebra..

So any teachers or people that have alot of experience in math that can help me? All he knows is adding/subtracting/multiplicat... No fractions, or really anything other then the basic math that I listed above.

2007-07-23 06:06:43 · 4 answers · asked by Anonymous

-35/1/7?

2007-07-23 06:03:11 · 5 answers · asked by Anonymous

-8(2m to tha second+m)

2007-07-23 05:59:59 · 2 answers · asked by Anonymous

2007-07-23 05:52:24 · 2 answers · asked by Anonymous

Whats the method used to simplify these fractions.
1) 2x^2 + 7x +6
(X-5)(X+2)
2) 2x^2 + 9x-18
(x+6)(x+1)
3) 3x^2 - 7x+2
(3x-1)(x+2)
its the top equation over the bottom
i need to know how they are done.
Thanks

2007-07-23 05:52:05 · 2 answers · asked by Anonymous

And 2 of them each weigh 100lbs. How many trips will they have to make to cross the river?

2007-07-23 05:37:16 · 13 answers · asked by Anonymous

2007-07-23 05:31:23 · 2 answers · asked by malo 1

Does the line that passes throught the points (-3,2) and (2,5) have a positive or negative slope?

^^ help again^^

2007-07-23 05:30:15 · 6 answers · asked by Kwan L 2

Ok so I was given homework on my summer break, right now im working on math. Its been awhile since Ive done these kind of problems so if someone could double check my answers for me that would really be nice.They all deal with simplifying.

1) (2 sqrt6)^2
My answer: 24

2) (sqrt6)(sqrt3)
My answer: 3 sqrt2

3) sqrt3/sqrt16
My answer: sqrt3/4

4) 8 sqrt5/sqrt4
My answer: 8 sqrt5/2

5) sqrt2/sqrt5
My answer: sqrt10/5

6) 3/sqrt12
My answer: sqrt12/4


Thanks!

2007-07-23 05:29:19 · 6 answers · asked by ellyceqt 1

There were some exercise books and files in a box. The number of exercise books was twice the number of files. Each time 7 exercise books and 5 files were taken out of the box. After a while, only 30 exercise books were left.
(a) How many files were taken out?
(b) What was the total number of exercise books and files in the box at first?

*Pls do not use algebra to solve the question. thks for all help!

2007-07-23 05:15:33 · 6 answers · asked by evabree 1

Any1 help with with slope..??

Find the slope of points (-3,2) and (-2,-1)

just tell which are y1,y2 x1 and x2 plz!!

help!!!!!!!

2007-07-23 05:15:06 · 13 answers · asked by Kwan L 2

A 720 ml container holds a mixture of red, yellow, and white paint in a 5 : 3 : 12 ratio. How much more red paint than yellow is present in the mixture?
My Answer:



20 ml.

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

72 ml.

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

108 ml.

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

180 ml.

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

200 ml.

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

2007-07-23 05:09:22 · 4 answers · asked by Michael H 1

A designer attempting to arrange the characters of his artwork in the form of a square grid with equal numbers in a row and columns found that 24 characters were left out. When he tried to add one more row and column he found he was short 25 characters. Can you find the number of characters used by the designer?
This is complicated to me please explain how to get a quadratic equation from this and what the number of characters are used by the designer

2007-07-23 05:04:20 · 3 answers · asked by littlesoutherner12 1

2007-07-23 05:00:22 · 4 answers · asked by @_@ 4

thats an example question... whats X?

2007-07-23 04:59:28 · 7 answers · asked by @_@ 4

In a race, there are 3 runners named Steve, Terry, and Dick.

Steve takes 2 seconds to reach her maximum speed.
Between 4~6 seconds she goes 15 m/s.
Between 6~7 seconds she slow down a little.
From 7~10 seconds she is running as fast as she was running at the 1st second.

Terry takes 3 seconds to reach his maximum speed.
From 3~5 seconds he runs 20m/s
From 5~7 seconds he slows down.
From 7~10 seconds he is running as fast as he was at two seconds.

Dick takes 10 seconds to reach his maximum speed.
At the 10 second mark he is going at 30 m/s.

If all 3 runners reached their maximum speed or slowed down in a linear fashion, who has ran the the most in the 10 second duration?

2007-07-23 04:57:22 · 2 answers · asked by LIFE HATER 1

Let A = {1, 3, 4, 5} and B = {4, 5, 6, 9} and let S be the "divides" relation. That is,
for all (x, y) is an element of A x B, x S y <->x | y.
State explicitly which ordered pairs are in S and S –1.

2007-07-23 04:56:39 · 3 answers · asked by Anonymous

(cos x / 1-sin x) - tan x = (1/cos x)

2007-07-23 04:55:11 · 4 answers · asked by Anonymous

2cos^2(theta) = 3sin(theta) + 3, for that theta is greater than or eqaul to 0 but less than or equal to 2pi

2007-07-23 04:52:17 · 3 answers · asked by Anonymous

cos(2x) = (1-(tan x)^2)) / (1+(tan x)^2))

2007-07-23 04:48:53 · 3 answers · asked by Anonymous

Hi all

I want to know the cut point

y=√3x+1
y=3-x

I cant get near the answer if i draw it it shows me a real answer but it takes a lot of time to do that so i wanna calculate instead. Can someone explain this in a easy way please.

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2nd problem

2-x>√x


same prob cant get near the answer

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3rd and last problem

I want to know the comparison that gows to these points
(3,3) (10,6)

please explain it in a easy way



thank you very very very much!!!!

2007-07-23 04:46:41 · 1 answers · asked by playerr 3

(sin2(alpha)) / (cos(alpha))

2007-07-23 04:37:45 · 3 answers · asked by Anonymous