Mathematics - 19 September 2007

last year i took trig and had to drop out and am taking it again this year but i remember i looked at this website that i can't find no but it showed me how to makethe unit circle in radians by assigning numbers to all the measures then going back and simplifying the fractions gave the radian measures but i can't remember how to do it. Does anyone know?

2007-09-19 05:14:31 · 3 answers · asked by senorita_otono 2

2007-09-19 05:13:47 · 19 answers · asked by RAY C 1

2007-09-19 05:10:09 · 1 answers · asked by itqueen293 2

3x + 2y = 15
2x - 3y = 9

how do you solve this question using algebra simultaneous equations.

2007-09-19 05:02:15 · 4 answers · asked by Anonymous

For a>0 and b>0 with a not equal to b, show that the square root of (ab) < (a+b)/2

I feel like I should be solving this by contradiction, and I keep trying, but I haven't managed to come up with it yet. I can't get it to work for some reason.

2007-09-19 04:56:29 · 3 answers · asked by yogastar02 2

A woman deposits $50,000 in a savings account with 4% continuously compounded interest. How many years must she wait until the balance has doubled?


Assume that the number of viruses present in a sample is modeled by the exponential function "f(t) = 10t," where t is the elapsed time in minutes. How would you apply logarithms to determine when the sample will grow to 5 billion viruses?



THANKS FOR THE HELP

2007-09-19 04:48:40 · 4 answers · asked by crackr 3

prove that a line tangent to the parabola x^2=4py at the point(a,b) crosses the y-axis at (0,-b)

2007-09-19 04:44:27 · 2 answers · asked by yassem1ne 2

What is (a surd question) in the form a + b Root* something.

I vaguely recall a question being something like that. Please show working.

2007-09-19 04:37:34 · 2 answers · asked by hurrahx 2

Hi, I'm a little stuck on this question.

I have the original graph y=x(6-x)

And I have another graph with points that go through (0.0), (1.5,4.5) and (3,0)

I think that it has been compressed by horizontally and vertically. And I believe the function of the is y=1/2f(2x). But I'm not sure. I'm wondering what the equation of this line would be. Any help would be appreciated. Thanks in advance.

2007-09-19 04:22:59 · 1 answers · asked by henry7836 2

how do you rationalise each denominator in:

1
__
(square root) v3


+


1
___
v5



and then express it as a single fraction?


please explain each step carefully and thoroughly.

thanks!
best answer is for first answer which is correct

but if someone answers before you they might not get best answer because their answer might not be as good as yours.

best answer is waiting.

2007-09-19 04:20:57 · 4 answers · asked by Anonymous

x=2
y=4

How do i do this and wat is the answer! we are doing coordinates and lines.

Thanx

2007-09-19 04:17:21 · 7 answers · asked by Matt 4

A. x = 12b/a
B. x = 12 - (b/a)
C. x = 12b - a
D. x = (12 - b)/a

2007-09-19 04:13:08 · 6 answers · asked by Smith 1

A. x = (y - d)/m
B. x = y - (d/m)
C. x = yd - m
D. x = ym - d

2007-09-19 03:59:26 · 5 answers · asked by Smith 1

September 19th was a Saturday in 1992.

2007-09-19 03:54:34 · 4 answers · asked by Damo 2

Let 0 ≤ b ≤ 4.Show that the area included by the two curves y = 1 - | 1 – x | and y = | 2x – b |
can not exceed (1/3)

2007-09-19 03:44:01 · 3 answers · asked by Anonymous

a) summation notation symbol ( n=1 to infinity) of 1/(2n+1)^3
b)summation notation symbol ( n=1 to infinity) of (3+sin(n))/(n^2)
c) summation notation symbol(n=1 to infinity) of n/((sqrt(3n+2))

2007-09-19 03:40:28 · 2 answers · asked by jojo 1

a) (x^2 - x - 1) / [ x(x+1)(x-1)


b) 3 / (x+1)(x+2)(x+3)



c) (x^2 + 10x - 6) / [x^2 (x-1) ]



d) (x^2 - 3x + 1) / (x-1)^3





Thanks sooo much!!
♥

2007-09-19 03:36:05 · 2 answers · asked by Anonymous

2007-09-19 03:26:50 · 9 answers · asked by COOL BUDDY 2

Which of the following IVP(initial value problem) is stable?
(i.e. the solutions converge for small changes
in the initial value.)

(1) y' - y = -4e^(-x) y(0)=2
(2) y' -2y = -6e^(-x) y(0)=2
(3) y' +2y = 2e^(-x) y(0)=2

2007-09-19 03:23:37 · 2 answers · asked by Guess who 1

a cylindrical jar of radius 5cm contains water to a depth of 4cm. the water is then poured at a steady rate into a hemisphere bowl of radius 6cm. after t seconds, the depth of water in the bowl is x cm and the volume, Vcm^3, of water that has been transferred is given by V= [pi x^2(18-x)]/3 cm^3. given that all the water is transferred in 25 seconds, find
(i) dV/dt in terms of pi
(ii) the rate at which x is increasing when x=3

2007-09-19 02:28:54 · 1 answers · asked by Anonymous

can you give me some puzzling questions in maths i want to do a project on the basis of this.
my id sreedevspillai@yahoo.co.in
send to this id

2007-09-19 02:23:57 · 3 answers · asked by Sreedev.s . 1

1) (5,1) and (-6,3)

2) (4,3) and (-2,-4)

3) (4/5, -1) and (2/3, 1/2)

4) (2a, 3b+1) and (a - 6, 13b+5)


ps.. write the solution if possible

2007-09-19 02:02:47 · 2 answers · asked by javv>>> 2

2007-09-19 01:56:11 · 3 answers · asked by jenilyn8268 1

2007-09-19 01:49:25 · 12 answers · asked by willow 6

2007-09-19 01:35:44 · 9 answers · asked by Anonymous

Pt. of Division of line segment

Help Pls!
1. The segment joining (5,11) and (-3, -1) is to be divided into four equal parts. Find the points of division.

2007-09-19 00:17:31 · 4 answers · asked by Anonymous