Mathematics - 19 September 2006

With a head wind, a plane flew 3600 km in 10 h. The return flight over the same route took only 9 h. Find the wind speed and the plane’s air speed. Assume that both were constant.



please.thnx

2006-09-19 23:52:52 · 14 answers · asked by barkadast3r 1

2006-09-19 23:47:12 · 5 answers · asked by Sxclicious 1

pls teach me the steps if you do know for any model but
best if your model is similar or exactly mine
thks
sharp el-506v

2006-09-19 23:05:50 · 1 answers · asked by supeyrio 2

suppose a family has three children.find the probability that the first two children born are boys. What is the probability that the last two children are girls?

i cna solve this problem. but, i m not sure if my answer is right or wrong.person who makes the most easiest way is going to get 10marks.

2006-09-19 22:24:40 · 5 answers · asked by free aung san su kyi forthwith 2

2006-09-19 22:09:10 · 8 answers · asked by dvjasmini 1

please help this is important

2006-09-19 21:19:50 · 8 answers · asked by Anonymous

2006-09-19 21:12:36 · 2 answers · asked by harsh vineet b 1

2006-09-19 21:11:12 · 5 answers · asked by amirlanaa 1

i think that there must be some maths involved which can predict correctly, for example the time taken to orgasm is inversely proportional to the amount of oxytocin in ur blood !!! and there must be constant to be multiplied too !!

2006-09-19 20:48:06 · 5 answers · asked by gaurav p 1

2006-09-19 20:41:29 · 10 answers · asked by KREAL1 2

One old man bought two sacks of mangoes from the market and each sack contained 100 mangoes.Between his home and market, there are hundred railway stations. He has no money that he can buy ticket. He goes to the station master and tells him the whole situation. Station master agrees in this condition that old man has to give number of mangoes equal to no of sacks in every station.example for if he has two sacks he has to give two mangoes, four mangoes for four sacks.the question is that how the old man is going to disrtibute the mangoes that some mangoes should left for himself.?Dont ask that in old india there are no trains. this question is modified and also assume that in every station old man has to give number of mangoes equal to number of sacks

2006-09-19 20:07:30 · 12 answers · asked by Naaz Khan 2

ok, this problem does not appear right. They are 10 to the -5 power, 10 to the 3rd power, 10 to the -4 power and 10 to the 10th power. (8.07 x 10 -5) x (7.00 x 10 3) is over (3.70 x 10 -4) x (9.67 x 10 10)


(8.07 x 10-5) x (7.00 x 10 3)
(3.70 x 10-4) x (9.67 x 1010)

I got 1.6 x 10 -8

If you can understand what I am asking, PLEASE help me!

2006-09-19 20:03:56 · 7 answers · asked by noodlenmac0329 2

A multiple cjoice exam consists of questions that have 4 answer choice. A certain student has a probabilty of 0.8 of knowing the correct answer to any particular question. if he doesn't know that correct answer, he guesses at random from the available choices.
1.what is the probability that this student gets one particular question correct?
2.if this student gets a certain question correct, what is the probability that he really knew the answer to the question?

help~ i can't not figure out..

2006-09-19 20:00:15 · 5 answers · asked by MATHDUMMY 1

last year, evans company produced furnace vents with a variable cost of $5. This year, the fixed cost has risen by 11%. If the cost of producing 100 furnace vents is now 508.88, what was the fixed cost last year?

2006-09-19 19:58:00 · 2 answers · asked by DeepFriedBrain 2

2006-09-19 19:45:37 · 19 answers · asked by joshwisll j 1

1) parabola
2) sine curve
3) algebra
4) quadratic formula
5) 6969
6) 12345

2006-09-19 19:41:46 · 4 answers · asked by ♪ ♫ ☮ NYbron ☮ ♪ ♫ 6

The function f is defined for all x that do not equal zero, in the interval -1 f(x)= (x-sin2x)/(sinx).

A) How should f(0) be defined in order that f be continuous for all x in the interval -1
B) With f(0) defined as in part (a), use the definition of the derivative to determine whether f'(0) exists. (I can probably do this part but I need some help starting this equation.)

And for those of you that have noticed yes I have been sitting here doing calculus for about 6-7 hours :P THANKS EVERYONE that has been helping out on some of this stuff, I'm still trying to get a hold on some of these concepts.

2006-09-19 19:20:07 · 7 answers · asked by Morph 1

Why we use complex representation for periodic wave?

Exp(-jwt)=cos(wt)-jsin(wt)

Is it because it looks short and we just need the real part? The imaginary part is what for?

2006-09-19 19:17:04 · 2 answers · asked by LJ 2

Does anyone have tips for this, especially for people not taking further math? It's the old Special Paper by the way, the one used in Singapore. Any theorems, manipulation tricks, concentrate on some qualitative answers? Aside from doing lots of practice papers. I'm doing the statistics option, by the way. The ten year series past year questions don't have answers, which is a pain. Any help much appreciated! =)

2006-09-19 19:04:01 · 2 answers · asked by draconsis 1

determine the ratio of 3 to 12 which is 3 Quart pot of chili with 12
combined ingredients of peppers and tomatoes.
This is my wording, and the ratio choices are:
peppers tomatoes
3: 2
2: 3
2: 4
3: 4
1: 6

I used this:
Divide both terms of the ratio by the greatest common factor (12/3=4, 36/6 = 6 )
4/6 = 2/3
State the ratio. (The ratio of 3 to 12 is 2:3)
The Correct answer is B
2:3
2 Peppers: 3 Tomatoes
My answer is incorrect,
What am I doing wrong?

2006-09-19 18:59:47 · 2 answers · asked by SCHNITZEL 1

If you don't know what string theory is you need to read a book.

2006-09-19 18:50:06 · 10 answers · asked by tengu312003 3

at what angle would they intersect at??

2006-09-19 18:41:12 · 8 answers · asked by Anonymous

integral of sqrt(14x-x^2) dx

2006-09-19 18:38:23 · 3 answers · asked by Theresa C 2

x-2y=8
y=-4x+5

and

x-2y=0
3x+y=0

2006-09-19 18:21:02 · 13 answers · asked by booo 1

2006-09-19 18:20:40 · 7 answers · asked by Devin J 1

A right circular cone and a hemisphere have the same base, and the cone is inscribed in the hemisphere. The figure is expanding in such a way that the combined surface area of the hemisphere and its base are increasing at a constant rate of 18 square inches per second. At what rate is the volume of the cone changing at the instant when the radius of the common base is 4 inches?

The surface area of a sphere of radius r is
S=4*pi*r^2
and the volume of a right circular cone of height h and radius r is
V=(1/3)*pi*(r^2)*h


I have taken the equation of the sphere and divided it by 2 for the equation of the Surface Area of a hemisphere then I found the derivative of that which makes the rate of change of the SA to be 8*pi.
Then I took that and divided by 18(in^2)/second
which comes out as (4*pi/9) seconds.
Here is where I am stuck and I do not know if the work I have done is even remotely close to my final goal rate of change of volume of the cone at 4 radius h.

Help Plz

2006-09-19 18:14:09 · 5 answers · asked by Morph 1

No other info is given just the picture of the graph. The graph I'm working on is a positive slope starting at (0,.5) and ends at (2, 5)

Any help is greatly appreciated!

2006-09-19 18:13:39 · 7 answers · asked by ecogrl23 2

Please help me?

2006-09-19 17:50:47 · 4 answers · asked by goof ball 2

integrate sin(2x)sin(x)dx

a=0 and b= pi/2

2006-09-19 17:39:38 · 4 answers · asked by Theresa C 2

2006-09-19 17:36:25 · 13 answers · asked by boy4year2007 1