Mathematics - 30 October 2007

A company is constructing an open-top, square based, rectangular metal tank that will have a volume of 67 ft3. What dimensions yield the minimum surface area? Round to the nearest tenth, if necessary.

2007-10-30 17:19:13 · 3 answers · asked by Good Boy 1

Hi, what is the difference between infimum and minimum?

2007-10-30 17:16:32 · 6 answers · asked by feiyingx 2

2007-10-30 17:13:09 · 3 answers · asked by Aurelia B 2

Find the P-value for all

1. the test statistic in a right-tailed test is z= 0.52

2. the test statistic in a two-tailed test is z= 1.95

3. In a sample of 88 children selected randomly from on town, it is found that 8 of them suffer from asthma. Find the p-value for a test of the claim that the proprtion of all children in the town who suffer from asthma is equal to 11%

2007-10-30 17:02:49 · 3 answers · asked by Dee R 2

How can I tell apart a geometric series from an alternating? Example: ∑ ((-6)^n-1)/(5^n-1), where n =1 and goes to infinity.

∑((-1)^n-1)/(n^6), where n=1 and goes to infinity.

Which is which? Should I just try to identify a and r, and if I get them, then is a geomtric? In other words, if I find the ratio, that proves the series to be geometric?

2007-10-30 16:29:11 · 3 answers · asked by Jorm 3

Why is it that for a hyperbola
y^2/ a^2 - x^2/ b^2 = 1

we can solve for the asymptotes by solving the equation
y^2/ a^2 - x^2/ b^2 = 1

2007-10-30 16:24:59 · 1 answers · asked by Anonymous

john saw 3 witches land in a field where they found a pile of pumpkins and a ghost. they agree to sleep over night in the field and divide up the pile of pumpkins up in the morning. during the night one witch wakes up and gives one pumpkinto the ghost taking exaclty 1/3 of the rest of pumpkins and falls back asllep. then the second witch wakes up and does the samething later the third witch wakes up and does the same. in the morning there are fewer than 10 pumkins left. they each take 1/3 how many pumpkins were there in the original pile?

2007-10-30 16:19:17 · 5 answers · asked by batgirl 2

Finding the derivative...do you just take the deriv..1/1/x^2 + 1 (2x)..i don't know..please help if you know...thanks a lot!

2007-10-30 16:13:27 · 4 answers · asked by KERRY K 1

ok ~ do u guys know how to solve this:

40=100( 0.88) ^ n

solve "n" ~ = . =

ummm-

i need the Hand doing way ( do u guys mind explain?)



also show me the calculator way if u can ^___^

THX U~

2007-10-30 16:09:56 · 2 answers · asked by toocutedoggy 1

Rewrite each equation in the form y= mx + b. Then write an equation for a line parallel to the first and passing through the given point.


1) 6y = 3x - 12; (2,-4)
2) 1/2y = 3x; (-2,-9)
3) 5y = 4x + 5; (-5,-4)
4) 10y = -20x -20; (1,-3)
5) 3x = 3y - 12; (-5,-11)

2007-10-30 16:05:05 · 6 answers · asked by erikjjjacob 1

sqrt(x) + sqrt(2x-1) - 2 = 0.

plz show me how to solve this

2007-10-30 15:57:15 · 8 answers · asked by yassem1ne 2

Writes the equation of the line parallel to the given line and passing through the given point.

1) y= x + 4; (2,5)
2) y= 3x - 1; (1,4)
3) y= 2x - 2; (2,8)
4) y= x - 7; (4,6)
5) y= 3x - 3; (-2,-5)

2007-10-30 15:56:44 · 5 answers · asked by erikjjjacob 1

e^x = 4 - 2x
*note: the stuff inside [brackets] indicates "sub" for example: x[n+1] --> x(sub)n+1

I got as far as x[n+1] = x[n] - ( ln(4-2x) / ((-2 / (4-2x[n])) - 1 )

I'm not even sure if that's correct either. I've been using x[1] = 1 as the starting point and after calculating up to around x[6] or so, I always end up with 1.499999 or 1.500000, which are both wrong answers.

Can anyone tell me where I'm messing up?

2007-10-30 15:49:46 · 5 answers · asked by enhancedbycolor 2

Final examination grades in an introductory stat course is normally distributed with a mean of 73 and a standard deviation of 8


If the professor grades on a curve (gives A's to the top 10% of the class regardless of the score) are you better off with a grade of 81 on this exam or a grade of 68 on a different exam where the mean is 62 and the standard deviation is 3? Answer statistically and explain

2007-10-30 15:49:36 · 2 answers · asked by Anonymous

I'm not sure how to do this problem:

Determine the binomial factors of x^3+4x^2-x-4

please show steps on how to solve it...

2007-10-30 15:49:26 · 1 answers · asked by Anonymous

The pressure of the air in the Earth's atmosphere decreases exponentially with altitude above the surface of the earth. The pressure at the Earth's surface (sea level) is about 14.7 pounds per square inch (psi) and the pressure at 2,000 feet above sea level is approximately 13.5 psi.

Write an equation that expresses pressure in terms of the altitude. (Use information given to find "r" first)

Thanks!!!

2007-10-30 15:41:19 · 1 answers · asked by Blondie4321 2

They told me something about having to use (b^2-4ac) to answer the problem but i have no clue on what to do, if you happen to know how to solve this problem please do so, with steps on how to do it please...

Find the discriminant, how many solutions does it have, real or imaginary. Then solve the quadratic equation:
4x^2-2x+9=0

2007-10-30 15:38:54 · 2 answers · asked by Anonymous

I don't remember how to do these y=mx+b problems. I got it wrong on my test .

The graph of 5y - 4x = 36 passes through which of the following points? The answer choices are a- (0,-9), b- (4,-4) or d- (-9,0). I took off c- (-4,4) because that's not the right answer.

How do you solve it?

2007-10-30 15:24:36 · 13 answers · asked by csj 1

Please help me!!!!!

2007-10-30 15:17:34 · 0 answers · asked by Anonymous

The user "Siddhartha Basu" posted four consecutive questions and in all of them gave the best answer to "Goutam", even though Goutam was never first with the correct answer, and often gave fewer details than other answerers. For example, in this case, Goutam just put one number:

http://answers.yahoo.com/question/index;_ylt=Am6dIA3II1E.mx_E02pyVpXty6IX;_ylv=3?qid=20071026213944AAb3aRt&show=7#profile-info-I1MBt7myaa

In this case he copied my answer verbatim:

http://answers.yahoo.com/question/index;_ylt=Aox5xofvyvuDHQUpLVd.qkTty6IX;_ylv=3?qid=20071026213856AA0g5gM&show=7#profile-info-I1MBt7myaa

This also happened in two other cases (which you can find by looking at either "Siddhartha Basu" or "Goutam"'s profiles.

Has this happened to others? What is the proper way to address this?

I do not know if it should, but this kind of thing really bugs me, and makes me much less inclined to take my time to type out explanations to questions.

Thanks for your advice!

2007-10-30 15:10:16 · 7 answers · asked by Phineas Bogg 6

2007-10-30 15:02:20 · 5 answers · asked by callee1968 2

A rectangle has an area of 70 square inches and a width of 3.5w. What is the length of the rectangle in terms of w?

Please help i need this answer!

2007-10-30 14:54:40 · 3 answers · asked by Doc Yankee30™ 5

rewrite the expression:
(log base 2 of x) +(3 log base 2 of y) - (5 log base 2 of z)
it not log[2] ( x y^3 / z^5 ) please help

2007-10-30 14:40:14 · 1 answers · asked by star baller 360 5

Explain this special "Holiday Math" equation...

25 XXX == 31 YYY

2007-10-30 14:36:20 · 2 answers · asked by Jim 1

Not looking for ways out of my homeword just want to know how to do it!

2007-10-30 14:33:53 · 3 answers · asked by DJared 2

Describe the concavity of the graph and find the points of inflection (if any).

1) f(x) = x^3 - 3x + 2

2) f(x) = x^3 (1-x)

Do NOT use a graping calculator, show where the concavities are (and inflection points if there are any). Show your work. Thanks! :)

2007-10-30 14:26:18 · 2 answers · asked by Anonymous

please answer with the correct answer

2007-10-30 14:25:22 · 6 answers · asked by Battman 3

2007-10-30 14:25:07 · 2 answers · asked by tristan 2

what is th average of 18,20,20,21,21,21,21,23,24,25,25,26,26,27,27,27,29,30,38,40

2007-10-30 14:20:27 · 4 answers · asked by Anonymous

rewrite the expression (log base 2 of x) + (3 log base 2 of y) -(5 log base 2 of z)it look like this log{2] (x) +3 log[2] (y) -5 log [2](z)
l
og[2] ( x y^3 / z^5 ) this is wrong please help

2007-10-30 14:19:55 · 2 answers · asked by star baller 360 5