Mathematics - 21 November 2007

2 equations are possible......

2007-11-21 23:42:52 · 5 answers · asked by jon g 2

LOL; As you can see our ungrateful kids have crάpped the whole math category to frustrating boredom! As a change I propose a bit more interesting stuff.
1) this problem was posted 2 weeks ago
http://answers.yahoo.com/question/index;_ylt=AnlJEhvRg1XOB4qLEB5R76jsy6IX;_ylv=3?qid=20071105142649AAumw5p
I wonder who can do it besides Scythian;
evaluate ∫dx sin(x*2007^207) /sin(x) {x=0 until pi};
2) here I shall not mention the source as it contains solution;
evaluate ∫dx (cos x)^2 /(1+ exp(sinx)) {for x from –pi/2 to +pi/2};

2007-11-21 22:53:05 · 2 answers · asked by Anonymous

A and B are two loran stations located at (-500,0) and (500,0), respectively. A ship's receiver detects radio signals sent simultaneously from the two stations and indicates that the ship is 600 miles closer to A than to B. Similarly, it is found that the ship is 100 miles closer to C, at (0, 1300), than to D, at (0,-1300). Where is the ship (point)?

2007-11-21 22:37:22 · 1 answers · asked by monogrith7 2

How to integrate that?
Thank you

2007-11-21 22:30:01 · 2 answers · asked by Anonymous

A comet follows a hyperbolic orbit about the sun, reaching its closest point to the sun at a vertex of 43 million miles. When the line joining the sun and the comet is perpendicular to the transverse axis of the hyperbola, the comet is 137 million miles from the sun. Give an equation for the comet's orbit if the axes are placed with the x-axis on the transverse axis and the origin at the center. Where is the sun (point)?

2007-11-21 22:18:48 · 1 answers · asked by monogrith7 2

1) y=logx-2logx

2007-11-21 22:09:29 · 5 answers · asked by Jackline W 1

Find the largest positive integer n for which n! can be expressed as the product of n-3 consecutive positive integers. For example 6! can factorial can be expressed as the product of 6-3 = 3 positive integers, namely 8, 9, and 10 (6! = 8*9*10).

Source: 1990 AIME #11

2007-11-21 20:10:02 · 4 answers · asked by absird 5

k my math teacher is such a jerk he comes in before class and talks to the students about random stuff then starts the class by writing a headline about what we've been doing last time and asking us what we know about it. So some students say different things and he sums it up and points to a problem that we don't know yet or an element we haven't covered yet and then he like leads the class through a proof or an example and asks us what we think happens next and like asks us what we think about that proof and where the big ideas in the proof were. Then he runs through an example and sets the good students a problem they can work on in class while he does another example for those who needs to see another example before they get to work on the problems too. He sets alternative harder questions people can choose to work on instead if they want to. He always allows questions to be asked and always answers them. He never sets reading homework and still everyone learns math. WHAT A JERK!!!

2007-11-21 19:33:24 · 13 answers · asked by Todd 1

When the sun’s angle of elevation is 30°, the shadow of a post is 6 ft. longer than when the angle is 45°. Find the height of the post.

2007-11-21 19:28:49 · 5 answers · asked by Peter 1

2007-11-21 19:28:46 · 4 answers · asked by Paradromer 1

2007-11-21 19:12:43 · 3 answers · asked by carlaann12 1

Determine whether the two lines l1 : (3,2,3,-1) + t(1,6,1,-1) and l2 : (1,0,1,1) + t(1,-3,-4,2), intersect in R4 , and if so, find the intersection point.

2007-11-21 18:59:42 · 3 answers · asked by Stevo H 1

2007-11-21 18:57:31 · 4 answers · asked by carlaann12 1

2007-11-21 18:50:54 · 9 answers · asked by Sujisnuffle 1

A straight line, with positive slope m , passes through the origin. The curve y=x(x–1)(2–x) also passes through the origin. For how many values of m , if any, is the straight line a tangent to the curve?

2007-11-21 18:38:59 · 2 answers · asked by Anonymous

Sum of digits of 2two digit no is 7. If the digits are reversed, the no. formed is 9 less than the original no. Find the original no. Please give step wise details

2007-11-21 18:20:56 · 13 answers · asked by srikanta B 2

how do i solve this 6x-2+2x=-2+4x+8

2007-11-21 17:45:05 · 12 answers · asked by Anonymous

2007-11-21 17:31:50 · 8 answers · asked by manda_56 2

7.give an example of a sequence x s.t. the range of x has exactly 3 elements.
8.is the following a function from the indicated domain to the indicated codomain?If it is not a function show that the function is not well defined by naming an equivalence class in the domain that is assigned two different values.
f: Z_3-->Z_6 given by f(x bar)={2x}
where we represent an element of the domain as an equivalence class x bar, and use the notation [x] for equivalence classes in the codomain.
14.For the canonical map f:Z-->Z_6, find
a)f(3)
b)the image of 6
c)a pre-image of 3 bar
d)all pre-images of 1 bar

2007-11-21 17:27:12 · 1 answers · asked by MJ 1

how many milimeters per inch

2007-11-21 17:13:06 · 6 answers · asked by alfordenterprise 1

5. prove that if f:A-->B with Rng(f) = C, and if f^-1 is a function, then f o f^-1 = I_c.
15. Prove or disprove
a)if f is a linear function with positive slope, f is increasing on R.
b)if f and g are decreasing functions on an interval I, then f o g is decreasing on I.
c)if f and g are decreasing functions on I, then f o g is increasing on I.
16. Give two different examples of
b)a pair of functions f and g s.t. (f o g)(x)=square root of (2x^2-5).
c)a pair of functions f and g s.t. (f o g)(x)=sin[abs. val](2x+4)
e)two quadratic functions f and g whose sum f + g is linear.

2007-11-21 17:11:53 · 1 answers · asked by MJ 1

how would you solve
(10x^3y^5)^-3
I dont really understand this please help

2007-11-21 17:10:42 · 5 answers · asked by ? 2

2007-11-21 16:48:30 · 6 answers · asked by remote control 1

This is a math problem probability theory.
Anyone know how you go about doing this problem?
I did the combination formula and found out there are 25,827,165 million different combinations of 6 numbers between the numbers of 1-54. Is the probability of winning 1/25,827,165?

2007-11-21 16:41:06 · 7 answers · asked by the worr e ore 5

Look at this picture. What are the tensions in the two cables?

http://i2.photobucket.com/albums/y6/VietIronChef/math.jpg

2007-11-21 16:39:28 · 3 answers · asked by Anonymous

I always thought a 3,4,5 triangle had angles of 30 60 and 90 deg
If so then the sin of 30 is not 1/2 but 4/5..huh..?

2007-11-21 15:56:39 · 6 answers · asked by c0cky 5

2007-11-21 15:46:59 · 3 answers · asked by James D 1

2007-11-21 15:46:28 · 1 answers · asked by Anonymous

How many different three-letter code words
can you make using the letters A,B and C
(a) If repetition of the letters is NOT Permitted
(b) If repetition of the letters IS Permitted.

2007-11-21 15:22:37 · 3 answers · asked by Anonymous

2007-11-21 15:21:21 · 5 answers · asked by Anonymous