Mathematics - 23 November 2007

Define Half-Life in a paragraph.

2007-11-23 05:32:24 · 5 answers · asked by aaaaaaaa 1

2007-11-23 05:18:14 · 2 answers · asked by Anonymous

1. Simpify 5√d^15 = d^3
2. Simplify ^3√x^6 = x^2
3. Simplify 6√16x+5√16x = 44x
4. Simplify x+2√x-8√x-9 = x-6√x-9
5. Simplify x+9√x+4√x-9 = x+5√x-9
6. Simplify sprt(5x^4y^4) times sqrt(6x^2y) = 30x^6y^5
7. Simplify (9√x+6)^2 = 81x+54√x+36

Got no examples in the textbook to proof that.

2007-11-23 05:18:13 · 2 answers · asked by Vinko B 1

1) funds were embezzled
2) mail from post office was stolen
3) his horce disappeared
4) his storage of whiskey is missing

His wife told him that according to rumors
1) the banker did not steal his horce
2) the postmaster did not embezzle the funds
3) cowboy Joe did not steal mail

Further investigation revealed that
1) the banker did not approach post office
2) the postmaster if afraid of horces
3) cowboy Joe is illiterate and cannot embezzle anything
4) nobody heard anything about the whiskey


(a) who embezzled the funds?
(b) who stole the mail?
(c) who stole sheriff's horse?
(d) what happened to sheriff's storage of whiskey?

2007-11-23 04:49:57 · 4 answers · asked by Alexander 6

Let P be a polynomial with integer (real) coefficients such that; (1) - the coefficient of the leading term and the independent term (counted as the coefficient of x^0 - 0 degree) are odd; (2) - The total number of odd coefficients (odd here refers to the coefficient itself, not to the degree of its corresponding term) is odd.

Like in
P(x) = x^3 - 5x^2 + 2x -7
P(x) = 9x^3 - 6 x^2 + 3x -5
P(x) = x^4 +5x^3 + 7x^2 + x +1
P(x) = 7x^5 + 2x^4 - x^3 + + 2x^2 - 8x -3

Show that P has no root such that both the real and the imaginary parts are rational. In other words, if a + bi is a root of P, then at least one of the numbers a and b is irrational.

2007-11-23 04:49:02 · 5 answers · asked by Steiner 7

All in relation to 20% mark-up margins. On going ? at our office

2007-11-23 03:57:27 · 2 answers · asked by Anonymous

If f: [a,b] -->R (real number set) is differentiable at c, a < c < b, and f ' (c) > 0, prove that there is x belongs to (c,b) such that
f(x) > f(c).

2007-11-23 03:56:41 · 3 answers · asked by Gabe 3

A polynomial is given p(x)=x^3-3x+2


x+2 is a factor of p(x)

1) express p(x) as a product of linear factors
a)sketch the graph of p(x). Indicate the co-ordinates of points where the graph intersects the co-ordinate axes. how do you draw a graph of an eqtn?


b) hence, or otherwise, solve the inequality

x^3-3x+2 is less than zero

its got a cubed in how do you solve it?

2007-11-23 03:47:25 · 7 answers · asked by Anonymous

by means of sketch or otherwise determine the range of values of x for which

x(2x-3)(x-4) are less than zero

2007-11-23 03:42:02 · 10 answers · asked by Anonymous

My language consists of 0/1/2/3/4/5/6/7/8/9 .
Zip codes identifies towns, villages and cities. if I read 43138. I would be saying: Logan, OH

2007-11-23 03:35:24 · 3 answers · asked by blueridgemotors 6

A contract is to be completed in 46 days and 117 men were set to work, each working 8 hours a day. After 33 days 4/7 of the work is completed. How many additional men may be employed so that the work may be completed in time, each man now working 9 hours a day?

2007-11-23 03:32:58 · 4 answers · asked by suri 1

I am stuck on this if someone can help me with it I thank you.

2007-11-23 03:29:29 · 2 answers · asked by Anonymous

Help please......... somebody.... help.....

How do you demonstrate that v at t = t0 ????

given that s(t) = 1.3t^2 + 7.8t

2007-11-23 03:28:49 · 4 answers · asked by Anonymous

2007-11-23 03:22:59 · 2 answers · asked by suman s 1

2007-11-23 03:10:32 · 8 answers · asked by datfreshness 1

I need to figure out if the infinite series of n^2*(-1)^n converges or diverges. It seems like it would diverge since n^2 is always increasing but I don't see how I can prove it with any of the tests that I know of since the alternating series test fails.

2007-11-23 02:52:57 · 4 answers · asked by aberrantgeek 3

28n+28q+32q+32n

A.(30+q) (30 +n)

b.60 (n+q) (n+q)

c.60nq

d.60 (n+q)

2007-11-23 02:46:36 · 5 answers · asked by Anonymous

4rs-25s^2/2rs+3rs-20s^2

2007-11-23 01:59:09 · 3 answers · asked by Kat 1

2007-11-23 01:19:46 · 5 answers · asked by nathan e 1

you know in calculus books when they want to estimate the volume of a shape in an interval like [a,b] they devide this interval into too many suintevals. then there will be too many rectangles. then they rotate each rectangle. and then they use cylinder's volume as a defined volume to find the total volume. (like an axiom)
my teacher said that in fact it's proven why the volume of a cylinder is that.
can you help me find it?

2007-11-23 01:17:05 · 3 answers · asked by amir 2

An airplane is sighted at the same time by two ground observers who are 3 miles apart and in front of the airplane. They report the angles of elevation as 13 and 24 . How high is the airplane?

2007-11-23 01:14:33 · 5 answers · asked by labelapark 6

2007-11-23 00:43:02 · 4 answers · asked by Anonymous

A photographer points a camera at a window in a nearby building forming an angle of 42 with the camera platform. If the camera is 52 m from the building, how high above the platform is the window, to the nearest hundredth of a meter?

Thanks.

2007-11-23 00:19:21 · 7 answers · asked by labelapark 6

I do know how to solve when an equation is like this :6x-3y=21 and2x+3y=19 where the +3y and -3y cancelled out each other and become zero.
What about an equation like this:6x-5y=21 and 2x+3y=19. find x and y.
please teach me how to solve this kind of equation

2007-11-23 00:07:51 · 15 answers · asked by Omar 1