Mathematics - 29 November 2007

they told me Algebra.. and something called linear algebra.. i really dont remember :( so what should i learn 1st


ps - ive ordered a book from amazon! (Calculus by Spivak)

2007-11-29 23:35:30 · 8 answers · asked by ? 4

2007-11-29 23:04:53 · 8 answers · asked by 01101001 3

2007-11-29 22:37:25 · 16 answers · asked by Anonymous

may someone please explain step by step. im a newbie and im lost....

thanks

2007-11-29 22:35:58 · 3 answers · asked by * blobbaah- 1

This is quite embarassing... I do the highest level of maths available in high school yet..

basic 3-unit trigonometry eludes me at the moment.

Remind me again how to solve cos2x = x for x?
And yes, I can do it, but I need to know the proper method to be able to solve harder ones coming up in the test.

I suppose this shows that no matter how easy the maths is, if you can't remember it.. it's very challenging..

(General solution is needed.)

2007-11-29 22:08:33 · 7 answers · asked by Girl 5

What do people learn in university about math? (heard that there is less manipulation of numbers and more proving)
What is the most interesting topic to you and why?
What is the most challenging topic to you and why?

2007-11-29 21:44:59 · 5 answers · asked by Anonymous

Could noncoherent detection be used with PSK signals?
thats all thanks

2007-11-29 21:32:14 · 1 answers · asked by mascix 2

Prove that the decimal expression of any rational number is periodic. For this, let a/b be your rational number, with (a, b) = 1 and b belongs to N.
(a) Show that there are two different non-negative integers k > l >= 0 such that (10^k − 10^l) is a multiple of b. Hint: if (b, 10) = 1 then apply Euler’s theorem. If not, write b = b1 x b2 with (10, b1) = 1 and b2 = 2r1 x 5r2 . Apply Fermat’s little theorem to b1 and figure out what to do with b2.
(b) Say why the previous part implies periodicity of the decimal expression. What can you say about the period?
(c) The decimal expression is said to be pure periodic if the periodic part starts “right after the dot”. For example, 43/6 = 7.16, 1/56 = 017857142 and 2/15 = 0.06 are not pure, while 10/11 = 0.90 and 1/37 = 0.027 are pure. Show that the decimal expression of a/b is pure if and only if (10, b) = 1

2007-11-29 21:17:07 · 2 answers · asked by azn137 1

A trapezium is divided into 4 triangles by its diagonals. Prove the ares of the coloured triangles are equal. Thank you

Try to imagine that the coloured triangles are the left and right triangled in the trapezium, meeting vertically opposite, instead of the ones above and below

2007-11-29 20:49:49 · 3 answers · asked by little zebulon 4

2007-11-29 20:23:33 · 28 answers · asked by . 1

solve the system.
xsqaured +ysquared =16
x+y=1
what are the solutions for x and y

2007-11-29 19:55:56 · 6 answers · asked by Purple 2

I need some help on this problem for Calc 1. I can't get the right numbers to come out.

I know how to find max / mins , and inc/dec , but this problem is harder than others and i need someone to show me how to do it.



a. Find the intervals on which f is increasing or decreasing
b. Find the l0cal maximum and minimum values of f.
c. Find the intervals of concavity and the inflection points

f(x) = (e^x) / (1 + e^x)

need to get crit numbers first and derivatives

Thx

2007-11-29 19:45:14 · 2 answers · asked by brobo8 1

I think log (10) 2 is 2/5 because at first 2 is over the sq root of 10 then you power up the 2 to make 4 then square root it so that the entire things a fraction but then hm.. I messed up.

2007-11-29 19:40:54 · 4 answers · asked by Anonymous

How do you find what the PST and GST tax was if they only give you the tax %s and the price including taxes.

ex. GST=7%, PST=9%
price including taxes is + $19.99

7%+9%=16% TAX

19.99/1.16 (total tax) =17.23 is the price before tax.
so 19.99-17.23=2.76 this is the total amount of tax 7% and 8%.

Now how do I find out what the GST and the PST of the total tax price 2.76 are.

2007-11-29 19:30:31 · 5 answers · asked by Anonymous

I've been given the question 2x^2 + 6x =5. Now, this is the first time I've tried to get rid of the coefficient, but the answer I'm getting isn't the same as in the answers. First, I get rid of the first coefficent, making it x^2 +3x =5/2. How would I go about turning that 3x into something I could use to square? And then how would I follow through with the rest of this? Thanks for the help! ^-^

2007-11-29 19:29:42 · 5 answers · asked by Wildfire 2

2007-11-29 19:17:02 · 7 answers · asked by Anonymous

If a|c and b|c and gcd(a,b) , then ab|c .
[Hint: By Theorem 2.12, p. 75, since gcd(a,b)=1 , we can write 1 = ax+by for some integers x and y . End of Hint.]

2007-11-29 19:16:58 · 2 answers · asked by garlin104300 1

2007-11-29 19:16:38 · 1 answers · asked by Dan 1

prove by binomial theroem

(n choose 0) - 1/2(n choose 1) + 1/3(n choose 2) -............+
[(-1)^n]/n+1 (n choose n) = 1/(n+1)

2007-11-29 19:12:13 · 2 answers · asked by garlin104300 1

2007-11-29 19:00:21 · 12 answers · asked by *.Jones 1

Please help me with this question (don't even know why it is related to congruency- pls answer in congruence method). Here goes:

Given that a rhombus is a parallelogram with all sides equal, prove that its diagonals bisect each other at right angles.

Thank you.

2007-11-29 18:46:24 · 2 answers · asked by little zebulon 4

2007-11-29 18:09:18 · 3 answers · asked by Kinu Sharma 2

r= 4sin x

r^2= cos x

2007-11-29 17:56:19 · 2 answers · asked by Anonymous

The museum of science in Boston displays a running total of the U.S. population. On May 11, 1993, the total was increasing at the rate of 1 person every 14 sec. The displayed population figure ate 3:45 pm that day was 257,313,431. Assume that the relative growth rate is constant.
a. What is the relative growth rate per year (365 days)?
b. At this rate, what will the US population be at 3:45 pm Boston time on May 11, 2001?

2007-11-29 17:34:11 · 1 answers · asked by thatisme 2

3x + 4y = --5

x --3y = --11

i got some ugly numbers for my answers so i am thinking i did somethings wrong, my answers are x= --227/13 and y= 28/13

2007-11-29 17:27:54 · 5 answers · asked by Boo Radley 4

2007-11-29 17:24:26 · 12 answers · asked by Anonymous

cont. to question: depth and length 35 ft. more than the depth. the pool holds 2000cubic ft. of water. wat are the dimensions of the pool?

2007-11-29 17:20:52 · 5 answers · asked by kenzi 1

2007-11-29 17:14:16 · 7 answers · asked by Anonymous

The altitude of a triangle is increasing at a rate of 1000 centimeters/minute while the area of the triangle is increasing at a rate of 1000 square centimeters/minute. At what rate is the base of the triangle changing when the altitude is 8500 centimeters and the area is 83000 square centimeters?

2007-11-29 17:08:36 · 3 answers · asked by Anonymous

A rancher wants to fence in an area of 500000 square feet in a rectangular field and then divide it in half with a fence down the middle parallel to one side. What is the shortest length of fence that the rancher can use?

2007-11-29 17:06:18 · 1 answers · asked by Anonymous