Mathematics - 28 October 2007

the volume of a cube is 125 in^3. find the surface area.

a. 25 in^2
b. 150 in^2
c. 100 in^2
d. 625 in^2

and this one!

in which way can a plane intersect a sphere?
a. a circle only
b. a line only
c. a point only
d. a point or a circle

HOW ABOUT THIS one... HELP plz

find the surface area of a sphere with a radius of 5 inches...

a. 100pi in^2
b. 166 2/3 pi in^2
c. 50 pi in^2
d. 38 1/2 pi in^2

2007-10-28 17:02:22 · 4 answers · asked by home_ed05 1

I was in a TA session for math a couple of weeks ago, and my TA was talking about some mathematician's set of numbers that could only be computed by computers in exponential (or was it logarythmic?) time. Because of this, only the first 4 have been found (even though an infinite number exist). Do any of you guys know what I'm talking about?

My TA gave the example of bringing friends to a party or something, but I didn't really follow. Anyone have any insight to what he/I am talking about?

2007-10-28 16:59:58 · 4 answers · asked by AJ B 2

this is the assignment:

find the lateral area of a right triangle prism with a height of 30 centimeters and a right triangular base with a leg of 12 centimeters and the hypotenuse of 13 centimeters


thanks again!

2007-10-28 16:38:28 · 1 answers · asked by Anonymous

f(x) = (x^3 -1) / (x^3 +1)
I am getting the first derivative as 6(x^2) / (x^3 +1)^2
Need Help with the second derivative. Please Help!!!
Thanks in advance.....
Pleaseeeeeeee explain....

2007-10-28 16:35:43 · 2 answers · asked by Lonely 2

any help please! and if you could be so kind as to show work or provide explanations...I WILL ETERNALLY LOVE YOU!

1.) what is the tenth term and the sum of the first ten terms of:
a.) 10, 7, 4, 1, ...
b.) 4, -2, 1, 0.5, ...

2.) what is the infinite sum of: 5, 5/3, 5/9, 5/27, ...?

thank you so much. please help!

2007-10-28 16:32:41 · 3 answers · asked by Answer 2

http://img3.freeimagehosting.net/image.php?6a6c1a8a03.jpg

Please help me with this problem. Thanks!!

2007-10-28 16:31:56 · 2 answers · asked by dkmu 1

a regular pyramid has a slant heigh of 9 meters. the base is a regular hexagon with sides that measures 4 meters. find the lateral area

help plz.. luv ya!

2007-10-28 16:27:04 · 3 answers · asked by Anonymous

thanks

2007-10-28 16:26:24 · 2 answers · asked by Anonymous

I= - [ 1/x lnx + 1/x ] from e to 7 (this is and integration prob)
turn that into this answer:
I= [(2/e) - (1/7)] (ln7+1)

2007-10-28 16:25:25 · 1 answers · asked by ruby 2

thanks! :(

2007-10-28 16:09:51 · 7 answers · asked by candy 3

Suppose the demand equation for a product is p=1600-8q where p is the price per unit in dollars when q units are demanded.

a.) At what level of production will the manufacturer's total revenue be maximum? (Please note: Revenue= price x quantity)

b.) Determine the maximum value

2007-10-28 16:07:28 · 3 answers · asked by Anonymous

I know all imaginary zeros come in pairs (complex conjugate). But for this question the answer is there are 3 complex and 1 real : (state how many complex and real zeros for the function) x^3 - x + 3
Please explain.

2007-10-28 16:04:34 · 4 answers · asked by dumbleeedore 1

a) y= 3x-2
y= -0.5x + 4

2007-10-28 15:54:18 · 1 answers · asked by Anonymous

thanksss =]

2007-10-28 15:39:03 · 5 answers · asked by put yur fangs up cobra style! 2

I understand a lot of this if i can get started. But sometimes im used to matrices and its a function, in this case its very odd to me. the question is as follows ...

Determin if the given function T is a linear transformation. Also find A such that T = F(a).

The function is
T:P2 -> by T(A0 + A1x + A2x^2) = (A0 + A2) + 2A1x + (A1 + A2)x^2

I cant even figure out how to start it. I know we need to prove T(u+v), T(u) + T(v), T(ru). Thanks for your help/time.

2007-10-28 15:38:26 · 1 answers · asked by BasAndit 1

for example 1/2+3/5

2007-10-28 15:36:39 · 29 answers · asked by Nustche 2

I know what the answer is, but I don't know how to get there.
All I have is:
f'(x) = sqrt(1 - x^2) - (x^2)/(sqrt(1 - x^2)
= ((1-x^2) - x^2)/(sqrt(1 - x^2))
= (1 - 2x^2)/(1 - x^2)

How do they get to the first step? I feel like they skiped a bit to save paper so now I am confused. :/

2007-10-28 15:25:50 · 2 answers · asked by wicky034 2

1.) Does this limit =0? or am I wrong?
Lim sin(pi/x)
x>0
2.) Does this limit exist?
Lim xsin(1/x)
3.) Is there a number such that the limit Lim as x tends to 0 of 2x^2-3ax +x - a - 1/ x^2 - 2x - 3

2007-10-28 15:23:02 · 1 answers · asked by Jessica 4

a. 145.3 yd^2
b. 42.7 yd^2
c. 36.3 yd^2
d. 21.4 yd^2


thank u!

2007-10-28 15:22:45 · 9 answers · asked by Anonymous

2007-10-28 15:22:34 · 6 answers · asked by Travis G 1

f (x) = 3 sqrt (8x+9)


f(101)

2007-10-28 15:09:49 · 4 answers · asked by ry ry 3

Find the minimum value of

216((xsinx)^2)/5 + 36xsinx + 30 + 25/(xsinx) + 125/(6(xsinx)^2)

for 0 < x < pi.

2007-10-28 15:08:08 · 4 answers · asked by absird 5

2007-10-28 15:00:16 · 3 answers · asked by angel 2

im not really good with math :(

2007-10-28 14:53:01 · 9 answers · asked by DaNee' 2

i have a huge exam tomorrow. i get everything except how to subtract negative numbers! whats an easy way or trick to remember how to do them!

2007-10-28 14:52:46 · 14 answers · asked by coloradogirl21 3

(x to the 5/3 power) to the 6 power

2007-10-28 14:51:18 · 6 answers · asked by ry ry 3

These are the only 4 questions I have left to answer out of 53... Please help..

1. The diameters of pencils produced by a certain machine are normally distributed with a mean of 0.30" and a sd of 0.01". In a random sample of 7 gross, approximately how many pencils would you expect to have a diameter less than 0.293"? A gross is a dozen dozen.Round your answer to the nearest whole number.

2. A certain grade egg must weigh at least 2 oz. If the weights of eggs are normally distributed with a mean of 1.5 oz and s.d. = 0.4 oz, approximately how many eggs in a random sample of 59 dozen would you expect to weigh more than 2 oz?

3. The amount of rainfall in January in a certain city is normally distributed with a mean of 3 inches and a standard deviation of 0.5 inches. Find the value of the quartile Q1.
a.3.3
b.2.7
c.2.8
d.0.8
4. Scores on a test have a mean of 89.1 and D2 is 75. The scores have a distribution that is approximately normal. Find the standard deviation.

2007-10-28 14:46:26 · 1 answers · asked by Anonymous

This is what I have so far, from the last question:::

84/2= 42
100 000/2= 50000

Then I divided each by 500, since 100 000/500 is 100. Then 42/500 is 0.084.

Is this the right answer? A simple yes, if it's right.

2007-10-28 14:42:39 · 2 answers · asked by Barbiex) 1

Solve it. I got 1.70 (rounded)
Correct?
You round 5's down, right? I can never remember...

2007-10-28 14:41:28 · 5 answers · asked by Anonymous

2007-10-28 14:34:45 · 1 answers · asked by Anonymous