Mathematics - 17 November 2007

for: 3x-2y= -6
and
3x-5y=4

2007-11-17 22:37:02 · 10 answers · asked by Anonymous

2007-11-17 22:16:39 · 4 answers · asked by Jeremy B 2

......positive terms. If (the summation from n=1 to infinity) of a_n is convergent, then (the summation from n=1 to infinity) of [sqrt(a_n)/n] is convergent.

Thanks!

2007-11-17 21:40:10 · 2 answers · asked by Anonymous

it's about math.

2007-11-17 21:28:45 · 8 answers · asked by Anonymous

2007-11-17 20:55:17 · 3 answers · asked by Anonymous

How would you work this problem? And what would the fraction answer be for x?

2007-11-17 20:15:58 · 7 answers · asked by Jeremy B 2

Hello,

I was wondering how one would solve a trigonometric equation such as the following:

cos x = sin 2x, (0 =< x =< 2pi)

For this equation, I ended up with:

sin x = 1/2,
x = pi/6, 5pi/6

However, the answers supplied with the question have 5 answers, 0, pi, 2pi, pi/6 and 5pi/6. How do I get the additional 3 answers?

Same goes for the next one:

sin 2x = sqrt(3) cos x, (0 =< x =< 2pi)

I end up with:
sin x = [sqrt(3)]/2
x = pi/3, 2pi/3

The answers are pi/3, pi/2, 2pi/3, 3pi/2

Thank you very much.

2007-11-17 19:39:18 · 2 answers · asked by w_gy_cc 2

consider the points A(0,2), B(-6,4) and the line L1 with equation 3y-x-12=0.
1) Find the equation of the circle C whose center is the point of intersection of the line L1,and the segment AB, and whose diameter is equal to the length of the segment AB

2007-11-17 19:34:14 · 2 answers · asked by Anonymous

1. Traveling downstream, a boat can go 18 km in 2 hrs. Going upstream, it makes only 2/3 this distance in twice the time. What is the rate of the boat in still water, and what is the rate of the current??

2. A river streamer travels 48 km downstream in the same time that it travels 32 km upstream. The streamer's engines drive in still water at a rate which is 16 kph greater than the rate of the current. Find the rate of the current.


pls. show your solution. pls. answer it i need it now, pls. i'm begging you pls. pls. pls.

2007-11-17 19:02:18 · 0 answers · asked by Anonymous

1. Linda put $800 in a regular savings account and $1000 in a special account. In one year she earned $120 in interest. Her brother invested $1000 in the regular account. He earned $144 in interest. What are the interest rates on each type of savings account?

2. A tank can be filled by letting pipe A run for 3 hours and pipe B run for 2 hours, or by letting pipe A run for 2 hours and pipe B for 4 hours. How long does it take each pipe running alone to fill the tank?



Pls. answer it i need it right now pls. i'm begging you pls. pls. pls.

2007-11-17 18:48:13 · 5 answers · asked by Anonymous

in a box, there are 6 red balls and 7 blue balls.Two blue balls are drawn in the first and second draw. assuming the balls are not returned, what is the probability of getting at least 2 red balls in the next three draws?

2007-11-17 18:43:39 · 9 answers · asked by J-weak 2

In math class, I am currently learning about Sine, Cosine, Tangent, Cosecant, Secant, and Cotangent. We have also just started a lesson on the unit circle. I have all the coordinates for the Unit Circle all plotted out for 30, 45, 60, 90, 120, 135, 150, 180, 210, 225, 240, 270, 300, 315, 330, and 360 degrees.

How do I find the Sin of 30 degrees? How do I find the Cosine of 30 degrees? How do I find the tangent of 30 degrees? The points for 30 degrees are, (square root of 3 divided by 2, 1/2).

Here is a link to the unit circle that I found on the internet:
http://hrsbstaff.ednet.ns.ca/eplee/images/Unit%20Circle.jpg

2007-11-17 18:36:24 · 4 answers · asked by middleeastconflict 2

Year......Population
1750.....790
1800.....980
1850.....1260
1900.....1650
1950.....2560
2000.....6080

a) Use the exponential model and the population figures for 1750 and 1800 to predict the world population in 1900 and 1950. Compare with actual figures.

b) Use the exponential model and the population figures for 1850 and 1900 to predict the world population in 1950. Compare w/ actual figures.

c) Use the exponential model and the population figures for 1900 and 1950 to predict the world population in 2000. Compare with the actual population and try to explain the discrepancy.

2007-11-17 18:01:13 · 7 answers · asked by Anonymous

How do I simplify

ln [square root[(x-1) / ((square root)(x+1))]]


Also how to simplify

ln [(x^x+1 / (1-x^3)) * (2^x / 7x)]

2007-11-17 17:50:22 · 6 answers · asked by Anonymous

2007-11-17 17:31:20 · 2 answers · asked by Tung P 2

1 What is the surface area of the figure?
(If necessary, round your answer to two places after the decimal point. Use meters for your answer--but do not write units in your answer.)
https://ecot.iqity.net/clsresshr/class.com/ewew_content/prealg1b/exammedia/020314.gif

i have no idea how to do that.

2 What is the surface area of the figure?

(If necessary, round your answer to two places after the decimal point. Use meters for your answer--but do not write units in your answer. Use 3.14 as your value for pi.)

https://ecot.iqity.net/clsresshr/class.com/ewew_content/prealg1b/exammedia/020312.gif

and how to find the volume of them too! does anyone care to explain :( 10 points for you :( c'mon. pweez.
PLEASE DO NOT JUST GIVE ME THE ANSWER. as helpful as it may seem, i would rather know how to do it than just pass the test!

2007-11-17 16:59:14 · 2 answers · asked by ehh 2

of the product jn is 9, what is the units digit of k ?

2007-11-17 16:59:14 · 5 answers · asked by Anonymous

Find the probability. Probability is the number of desired outcomes divided by the total possible cases. Find these parts seperately.

2007-11-17 16:54:39 · 2 answers · asked by petrified005 1

the information content of a bit pattern is 1010101010101011. Using an even parity scheme algorithm, derive the value of the checksum field of a two-dimentional parity scheme. Minimum-length checksum field should be use. two-dimensional parity checks can correct and detect? can a double-bit error be detected and corrected?

2007-11-17 16:38:58 · 2 answers · asked by Anonymous

2007-11-17 16:24:21 · 12 answers · asked by iluvorlando95 2

3y-x<9
Y+2x<10
y>0

The < and > have the _ under them.

I'm having problems doing this chapter. These are not the orginal questions so it's important to include all steps so I can get the hang of it!

2007-11-17 15:54:04 · 5 answers · asked by chicata25 4

thanks greenwhite, you're the best!!!

2007-11-17 15:39:00 · 5 answers · asked by lynne 2

Use the binomial theorem to find the third term in the expression of (n-2p)^6

I already read the book, it didnt help.

2007-11-17 15:31:01 · 4 answers · asked by ehrlich 6

In the target at the right ring A, ring B and circle C have diffrent point values. The sum of the point values of A and B of 23, of B and C is 33, and of A and C is 30. What is the sum of the point values of A, B and C?

2007-11-17 15:26:04 · 2 answers · asked by GF 1

I'm doing logarithmic equations and i got stuck on this part. I guess i forgot how to do rational equations. any help is appreciated. Thanks so much.

2007-11-17 14:48:11 · 5 answers · asked by jebo 1

1. The sum of two numbers is 36 and their difference is 16. Please work this out and show me the steps to acheiving the right answer-please! This isn't the orginal question so please show steps so I can do it right.

2. Bob runs a fruite stand, selling boxes of fruite. He sells Oranges for $11/a box, and grapefruite $10/box. He sold 762 boxes toltal, and his income was $8125. How many boxes of Oranges did he sell?
I want to add the $11 and $10 and then divide by $8125, but I don't think it's right. HELP!

Can someone please help me out with these:) Math's not my strong suite!

2007-11-17 14:41:42 · 12 answers · asked by chicata25 4

please answer this question.. it's very crucial to me..

remember it's about number bases n don't forget to show the work

2007-11-17 14:08:10 · 10 answers · asked by you''ll never waklk alon 1

this is a math problem

2007-11-17 13:51:31 · 6 answers · asked by Rebecca M 1

Not sure how to do this...any help would be appreciated.

1.) A rectangle is inscribed in a semicircle of radius 2. What is the largest area of the rectangle?

2007-11-17 13:40:43 · 4 answers · asked by Sean G 1

-x - 2y = 3
y= 2 - 4x

2007-11-17 13:25:53 · 5 answers · asked by rigo201113 1