Mathematics - 21 August 2007

Hi can someone tell me the following percentile scores please.

21 of 30= %?
16 of 30=%?
22 of 30=%?

thanks

2007-08-21 23:43:14 · 11 answers · asked by KB 3

A farmer had a triangular plot measuring 15m, 20m, 25m.the sides of the triangle. He kept his three horses attached to three poles at the vertices of this plot by a rope 7 m. How much of the plot is ungrazed (grass not eaten)?
If you answer this question, you qualify for IIT. I request all IIT students not to answer, please.

2007-08-21 22:34:00 · 4 answers · asked by pereira a 3

Two planes travel from Manila to a southern city in the Philippines, the distance is 900km. Plane A has a ground speed of 90km/h faster than Plane B, and arrives 2 hours and 15 minutes earlier than Plane B. What is the ground speed of Plane A?

2007-08-21 22:30:02 · 2 answers · asked by John Sabre 1

plz help

2007-08-21 22:28:04 · 3 answers · asked by tasnim 1

A five digit number is formed using digits 1,3,5,7 & 9 without repeating any are of these. What is the sum of all such possible numbers?

2007-08-21 22:13:00 · 4 answers · asked by Anonymous

1. The position of a ball thrown up from the top of a building 150 ft tall with an initial velocity of 20 ft/sec is given by the function s(t) = 16t² + 20t + 150. What is the maximum height of the ball?

2007-08-21 22:04:44 · 2 answers · asked by Lucy A 1

i know the answer is .707 but getting my calcilator to say it is another thing can you help ?

2007-08-21 21:56:26 · 5 answers · asked by y y 1

8 boxes of the same size and weight and another one with same size but less weight
9 boxes where mixed & you have a balance equipment with two plates
by using it only two times detect the box of less weight

2007-08-21 21:48:33 · 9 answers · asked by ^-^ engineering student ! ^-^ 4

What method is used to work out this question? (please dont give me the answer, just the best way to work it out!);

a guy is an air-traffic contoller who controls the airspace between Cairns and Coolangatta.
Part of his job is to give instructions to pilots as to the path along which they fly.
He has control of a plane flying an altitude of 30 000 feet.
He orders the plane to descend by 3 000 feet at an angle of 30 degrees.

How far (in feet) has the plane travelled from the start of its descent to the time it has descended 3 000 feet?
Draw a diagram to help you.

Okkkk i have no idea how to work this out but like i said before pleeeeeaaaaase dont give me the answer! I only need to know the method of how to work this out.

Thanks guys!

2007-08-21 21:36:42 · 4 answers · asked by Anonymous

If z1 = 1 - 5i and z2 = 3 + 4i

z1 / lz2l

i.e. What is z1 divided by (the absolute value of z2)??

2007-08-21 21:35:42 · 2 answers · asked by jeska102 1

and speed

2007-08-21 21:13:38 · 6 answers · asked by Anonymous

If a curve has the gradient, g'(x) = k / (x^2) - [square-root of (x)]

where k is a constant and a stationary point at (4 , -2), then the value of k is?

I think u have to integrate it or something.

The answers is 32? but can someone show me how they get 32 in a fully worked step-by-step solution.

2007-08-21 21:02:14 · 3 answers · asked by Anonymous

Leon's new tank will collect water off the roof of his house which is 160m2. He intends to use the water for watering the garden and washing his car. Leon estimates that he will use approximately 80L of water per day. If the average rainfall in June is 70mm, how full will the tank become by the end of June if it is empty in the start?

- 1mm rain per m2 = 1L water



Note: Please show working out.

Thank-you so much.

2007-08-21 20:48:15 · 3 answers · asked by Inhaler 4

-20/w+4=-12/w

thats divide

2007-08-21 20:33:44 · 3 answers · asked by regine f 1

1. log_5 x+3=log_5 (x-20)+4

2. log_2 x+5=8-log_2 (x+7)

3. log_x 9=-2

2007-08-21 19:20:06 · 2 answers · asked by Gael C 1

1. 2/x-2 - 3/x-1

2. 8x-8/x^2+x-2

3. 2/x-2 divided by x-1/4x-8

2007-08-21 18:41:57 · 2 answers · asked by patrice cadet5 1

Two canoe riders must be selected from each of two groups of campers. One group consists of 3 men and 1 woman, and the other group consists of 2 women and 1 man. What is the probability that 2 men and 2 women will be selected?

*pls include details as to how to solve it. thanks!

2007-08-21 17:57:40 · 6 answers · asked by almond flakes 2

1. The position of a ball thrown up from the top of a building 150 ft tall with an initial velocity of 20 ft/sec is given by the function s(t) = 16t² + 20t + 150. What is the maximum height of the ball?

2. The expression [1/ secx-1 ] - [1/ secx + 1] may be simplified to... either 2 cot² x or tan² x. i'm not sure which one.

3. The smallest interval of theta that will produce a complete graph of the polar equation r= -3cos2theta is..... my answer is [0, pi] is that right?

thanks!

2007-08-21 17:53:48 · 2 answers · asked by Lucy A 1

0.999999999999999999.... == 1

Is this correct?

I think it is. Am I wrong?

2007-08-21 17:37:04 · 26 answers · asked by Nisovin 5

Ok, I've tried this but I'm really not confident that I did it right. The question is..

A rectangle has a perimeter 20 m. Express the area of the rectangle as a function of the length of one of its sides.

I'm guessing there is more than one answer to this question.

Can someone please help me out?

Thanks so much!

2007-08-21 17:07:46 · 11 answers · asked by Jackie 2

What are the domain and range of the function
f(x)=1/(sq. root of(9-x^2))???

2007-08-21 16:53:21 · 5 answers · asked by Anonymous

1) 0.3[-6]
2) -square root sign wit 6 inside
3)-0.4 (=)(>)(<)0???

2007-08-21 16:50:22 · 4 answers · asked by Chloee((: 1

what does 1/3 mean, on the volume of a pyramid? is it 1 divided by 3? or is it 1/3 as a fraction?

2007-08-21 16:39:23 · 8 answers · asked by . 4

I got to 15/60*40+24/60*220/60. Is that right....please explain how to solve 1/4*2/3+2/5*11/3

2007-08-21 16:36:46 · 5 answers · asked by Dee 1

2007-08-21 16:35:14 · 4 answers · asked by Derek B 1

In the following, choose the answer with the correct number of significant figures: 4.28 / 81 equals?

A. 0.05284
B. 0.0528
C. 0.053
D. 0.05
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The following description uses accepted SI notation and punctuation: 1 mol = 1 x 1012 nmol, true or false?
---------------------------
The following description uses accepted SI notation and punctuation: 1 mol = 1 x 109 mmol, true or false?
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And please tell me why if you can.

2007-08-21 16:18:48 · 2 answers · asked by Anonymous

In the problem,

"y=6 cos x", do I just find the integral of "cos x" or do I do something with the 6?

2007-08-21 16:14:52 · 3 answers · asked by Muffins 1

my daughters homework

2007-08-21 16:11:18 · 7 answers · asked by Hillbilly 2

The average salary of 5 employees at Toys 4 All is $35,000, but the average of these 5 employee's and their manager's salary is $41,000. Based on this information:

How much does the manager earn each year?

What is the total cost for Toys 4 All to raise the salaries of the 4 employees to $40,500?

Toys 4 All increased the manager’s salary to $80,000. How does this new change affect the mean salary of the 6 people (1 manger and 5 employees)?

2007-08-21 16:07:53 · 4 answers · asked by angel 1

2007-08-21 15:58:47 · 7 answers · asked by blue15 1