Mathematics - 26 September 2007

2007-09-26 23:37:44 · 8 answers · asked by small 7

Could anyone do this for me, and show me the steps, please?

4x-3=7x+8


3(x-5)=x(4+3)

2007-09-26 23:24:52 · 9 answers · asked by Anonymous

2007-09-26 23:22:00 · 5 answers · asked by Becky 1

I have three evidences: B1, B2, B3 (this means they are already known)
And I want to predict A given these evidences, so according to the bayes theorem, it should be:

P(A|B) = P(B1 | A) * P(B2 | A) * P(B3 | A) * P(A) / P(B)

Is this correct?

If yes, my question is that is the denominator P(B) in this formula equal to P(B1) * P(B2) * P(B3)? My teacher already told me this is wrong, but I just don't understand why.

Could experts please explain why as simple as possible because I am very new to probability and statistics.

Thank you very much for your help.

2007-09-26 23:17:25 · 1 answers · asked by I need answers 1

Find the smallest integer value of n for which 120n is a perfect square.

My answer is n = 7.5

Is it correct?

If not, could you please show me your workings? I want to learn, thanks.

2007-09-26 23:13:49 · 3 answers · asked by Anonymous

The Great Singapore Sale 40% off, save $32!

Using the above information, find the sale price of the jacket.

2007-09-26 22:44:15 · 6 answers · asked by Anonymous

Show me your workings..Thanks.

2007-09-26 22:38:11 · 10 answers · asked by Anonymous

A ten volume set of books stands on the shelf. The first five books (1-5) are each 7.4com thick. The last five books (6-10) are each 9.6 com thick. A bookworm starts at the front cover of volume one and eats his way in a straight horizontal line through to the back cover of volume ten. How far does the worm travel

2007-09-26 22:19:09 · 5 answers · asked by Anonymous

A row of 10 shops is to be painted in 3 colours. 2 shops are to be yellow, 3 to be red and 5 to be blue.

Find the number of ways in which the row of shops can be painted given that the first and the last shops in the same row are of the same colour.

Please help. Thanks!!

2007-09-26 20:52:11 · 3 answers · asked by silent 1

(for the viewing area), how wide and how high is the viewing area of this television?
I'm stuck on this problem.

2007-09-26 20:16:54 · 2 answers · asked by glamour girl 1

How far is it from one corner of the field to opposite corner? I know I have to use the quadratic formula, but How? Please help!

2007-09-26 20:12:32 · 3 answers · asked by glamour girl 1

10x^-2 +33x^-1 -7=0...please sure your work and how you got the answer..it would be greatly appreciated

2007-09-26 19:50:27 · 4 answers · asked by Anonymous

(8x^2 - 5x + 1/sq rt 8) / (x-2) (x^2 + 4)

i've tried substitution but got stuck. any help would be great. thank you.

2007-09-26 19:45:46 · 2 answers · asked by Maddie 1

step by step how do i get this answer i cant do fraction ones or i dont know how to right now

2007-09-26 18:30:54 · 10 answers · asked by danny s 1

i have few questions...

1. If f(x) = x / cot(x) , then f' ( Pi / 4 ) =?
( this problem... i jsut dont get it....)

2. F(x) = G[x + G(x)] , howd you find F'(x) of this??

3. What is the fourth derivative of F(x) = (2x-3) ^ 4
( im not sure if this is 24(2^3) or 24(2^4))

thx

2007-09-26 18:20:05 · 3 answers · asked by Anonymous

i want to see if i did this right.
3square root(2x^2+4)
X=(1/2)
the answer is 7 right?

2007-09-26 18:15:36 · 2 answers · asked by Anonymous

In a triangle, the smallest angle is 36 degrees less than half the largest angle. The middle angle is 60 degrees more than the smallest angle. What is the measure of the largest angle?

2007-09-26 18:01:44 · 4 answers · asked by DoWHATiDO 3

multiplying radicals

root 8 * ( - root 18)

root 7 * root 8 = root 54 right?

- root 2 * 3 and root 8

2007-09-26 17:49:32 · 2 answers · asked by Anonymous

By Expanding e^(X(1+i)) in a power series, How can I show that....

a. e^x cos x = (The summation of n = o to infinity) (1/n!)(X^n)(2^(n/2))sin (3.14n/4)

3.14 = Pi

2007-09-26 17:36:12 · 1 answers · asked by WhoaNonstop 2

I know I need to assume n is odd, then show that there exists an integer k such that n^2 = 8k + 1

so assuming n is odd
i can say n=2j + 1 (where j is an integer)
n^2= (2j +1)^2


but i just can't figure out how to manipulate this in order to prove the conclusion! am i even starting right?

please help! :)

2007-09-26 17:16:13 · 2 answers · asked by Anonymous

A drilling rig, a km offshore, is to be connected by pipe to a refinery on shore, b km down the coast from the rig. If underwater pipe costs w dollars/km and land-based pipe costs l < w dollars/km, what values of x and y give the least expensive connection?

2007-09-26 17:11:50 · 1 answers · asked by SikhistOne 1

I converted 115 yd cubed to ft cubed and got 1380 ft cubed.

2007-09-26 17:10:03 · 3 answers · asked by Jen 4

A right circular cone has an altitude of 12 ft and a base radius of 6 ft. A second cone is inscribed in the first, with its vertex at the center of the base of the first cone and its base parallel to the base of the first cone. Find the dimensions of the cone of maximum volume that can be so inscribed.

2007-09-26 16:58:27 · 3 answers · asked by DaOne 1

2007-09-26 16:47:32 · 1 answers · asked by rustyjosh2 2

What is the mass, in kilograms, of 14.0L of gasoline? (Assume that the density of gasoline is 0.680 g/cubic cm

2007-09-26 16:42:47 · 4 answers · asked by Anonymous

0
∫ e^(3x) dx
-∞

Thanks for your help!

2007-09-26 16:38:16 · 4 answers · asked by mrbsktbll10234 1

2007-09-26 16:37:33 · 11 answers · asked by . : : stephanie : : . 4

a)The first 6 terms in row 25 of Pascal’s triangle are 1, 25 , 300 , 2300 , 12650 , and 53130. Determine the first 6 terms in row 26.

How would i answer this question please help!!!
Thank you

2007-09-26 16:32:16 · 5 answers · asked by Anonymous

3(x+5)
---------- = 2x-2
5

2007-09-26 16:30:43 · 9 answers · asked by Abiku 6

2007-09-26 16:28:34 · 10 answers · asked by . : : stephanie : : . 4