Mathematics - 2 August 2007

simplify: [(21x^-2)(y^3) / (15x^3)(y^-5)]

answer: (7x^8) / (5x^2)

The product of two numbers is 24. If one of the numbers is x, express the sum of the two numbers in terms of x.

Find the value of k if the equation 4x^2+kx–3=0 has roots –21 and 23

Please help me with these questions with some steps would be helpful, I am not allowed to use a graphing calculator.

2007-08-02 22:32:36 · 4 answers · asked by blah 3

There are 4/5 as many men as women in your Biology class. What fraction of the class are women?
What are the steps in solving this

2007-08-02 21:50:55 · 6 answers · asked by blah 3

There's a game: I say a number from 1-6, then you say one from 1-6, and it goes back and forth, and we keep track of the sum. The person who makes the sum reach 50 wins. How can you ensure you always win?

2007-08-02 21:45:24 · 2 answers · asked by Anonymous

What is the inverse LaPlace Transform of 7[e^(-7s)]/(s+7) I suspect it is the result of two functions one of whome is right time shifted by 7 sec.

2007-08-02 21:08:44 · 1 answers · asked by 037 G 6

2007-08-02 21:02:06 · 3 answers · asked by Anonymous

2007-08-02 20:56:41 · 3 answers · asked by TandL 3

2007-08-02 20:35:55 · 5 answers · asked by ffun75 2

2007-08-02 20:14:04 · 3 answers · asked by ffun75 2

Is 12:10 the same as 10:12?

2007-08-02 20:12:57 · 11 answers · asked by Pro90 1

2+n?
2xn?

2007-08-02 20:09:30 · 5 answers · asked by Anonymous

a. How many days will be required for plowing if a tractor and 10 hired hands will work together?

b. A tractor and 10 hired hands working together are expected to finish the job at a certain time as answered in the first problem. If the tractor and 10 hired hands worked together at first and then on the end of the second day, the tractor broke down, how many more workers are needed to be hired to finish the job on time?

Please answer with explanation. Thanks!

2007-08-02 20:03:50 · 4 answers · asked by Just Asking 2

Janice got a 6% raise. If she was making $8.50 per hour, how does she make now?

ANYONE KNOW ANSWER??? PLEASE HELP-THANKYOUU!!

2007-08-02 19:52:06 · 7 answers · asked by kat 2

a car moves along a straight road in such a way that its velocity at any time in t seconds is given by

v(t) = 3t√16-t^2
0≤t≤4
find the distance traveled by the car in 4 from t=0 to t=4

I have no idea what to do. In this chapter they list the properties of a definite integral and the average value of a function. I don't know what tool to use.

2007-08-02 19:48:12 · 3 answers · asked by clawedstar 1

Express the complex number p+q in x+iy and exponential form. Help!!! I can't work this out because the angle for q is differrent under sin and cos.

2007-08-02 19:47:31 · 3 answers · asked by Mathlover 1

1. A car with a wheel diameter of 2 feet, covered a distance of 26 miles in 39 minutes. Find the angular velocity of the wheel in revolutions per minute and radians per second.

2007-08-02 19:29:28 · 5 answers · asked by ~steffi~ 2

If the earth's circumference is 24,800 miles, what is the linear velocity of a person standing on the equator in a span of 24 hours?

2007-08-02 18:56:54 · 4 answers · asked by Anonymous

Determine the nature of the local extremem values and the points of inflection of any three members of the family of functions in the form f(x)=a|x^n-b|+c? (n>1, aeR,beR,ceR and a not= 0, b not= 0), and draw their graphs using the TI-89?

If someone could give me step by step how to do this I would really appreciate it. I have to submit today and have no idea :)

2007-08-02 18:28:35 · 2 answers · asked by Anonymous

2007-08-02 18:26:26 · 11 answers · asked by BOOST 1

2007-08-02 18:23:32 · 13 answers · asked by Jstevens 2

2007-08-02 18:16:35 · 6 answers · asked by growlingfrogs 1

2007-08-02 18:14:31 · 11 answers · asked by BOOST 1

One of the partial derivatives of f:R^n --> R exists at a point a and the other n - 1 exist in an open ball centered at a and are continuous at a. I thought all partial derivatives needed to be continuous at a and exist in a neighborhood of a, but I was told this is not the case.
Thank you

2007-08-02 17:57:05 · 2 answers · asked by Sonia 1

Euclidean Parallelism

As shown by the tick marks, lines a and b are parallel. We can prove this because the transversal t produces congruent angles.Given straight lines l and m, the following descriptions of line m equivalently define it as parallel to line l in Euclidean space:

Every point on line m is located exactly the same minimum distance from line l ('equidistant lines', not including the degenerate case where m = l).

i interpreted it as 'every line is not parallel to itself?
is it correct?

link to the original article:
http://en.wikipedia.org/wiki/Parallel_lines

2007-08-02 17:49:02 · 3 answers · asked by Anonymous

Hi!!! Could you help solve one of these math challenge??? With solutions please!!! (there's like an easier way to get these than just calculate all of it):

1. (2-2/2)*(2-2/3)*(2-3/4)*.........
2. 1+2-3+4+5-6+7+8-9+...........+...
3. 100-98+96-94+92-90+..........+...
4. (2+4+6+.....+100) - (1+3+5+.......+99)

2007-08-02 17:39:23 · 5 answers · asked by justin 1

Hi!!! Could you help solve one of these math challenge??? With solutions please!!! (there's like an easier way to get these than just calculate all of it):

1. (2-2/2)*(2-2/3)*(2-3/4)*...............(2-2004/2005)
2. 1+2-3+4+5-6+7+8-9+...........+601+602-603+604+605-606
3. 100-98+96-94+92-90+..........+8-6+4-2
4. (2+4+6+.....+100) - (1+3+5+.......+99)

2007-08-02 17:37:23 · 3 answers · asked by Anonymous

A virus scanning program is checking every file for viruses.
It has completed checking 40% of the files in 300 seconds. How long should it take to check all the files?

2007-08-02 17:07:49 · 11 answers · asked by Anonymous

Let B be a Baire space without isolated points that satisfies the T1 axiom. Suppose B contains a countable and dense subset D with complement D'. Can there exist a continuous f:B --> B that sends elements of D into elements of D' and vice versa? Specialize your conclusion for the case of R, Q and I. In this case I know such function doesn't exist, but the proof I know is based on cardinality, not Baire spaces.

Thank you for any help.

2007-08-02 16:31:40 · 2 answers · asked by Sonia 1

2007-08-02 16:14:30 · 12 answers · asked by kedra w 1

2007-08-02 16:13:50 · 6 answers · asked by kedra w 1

Solve problem involving percent.

2007-08-02 15:49:43 · 12 answers · asked by Anonymous