Mathematics - 22 July 2007

Given r = -0.998 when x = 5 and y = 15, which of the following is more likely?



a. x = 10 and y = 18

b. x = 10 and y = 12

c. Can not be determined

2007-07-22 16:55:38 · 2 answers · asked by kmsmall26 1

1. Mark is designing a pentagonal shaped play area for a daycar facility. He has 30m of nylon mesh to enclose the play area. The triangle in the diagram is equilateral. Find the dimension of the rectangle plus the triangle, to the nearest tenth of a metre, that was maximize the area he can enclose for the play area.



2. The daigram of a practice field shows a rectangle with a semicircle at each end. The track and field coach wants two laps around the field to be in 1000m. The physical education deparement needs a rectangluar field that is as large as possible.

a) Determine the dimensions of the track that will maximize the entire enclosed area. Do these dimensions meet the needs of the track coach and the phys. ed. department?

b) if only the rectanglular portion of the field is maximized, can the track team run the 100m dash along a straight part of the track? Justify ur answer.


PLEASE HELP SHOW UR WORK! i have my exam tomorrw :(

2007-07-22 16:43:19 · 6 answers · asked by mystery_girl07 2

Solve the system by addition.
x + y = 4
x – y = 10

2007-07-22 16:41:54 · 9 answers · asked by Sara B 3

my book said that -x+y=4 is perpendicular to x+y-2....how did this happen? can you explain to me how to get the perpendicular line of a certain equation of line

2007-07-22 16:24:33 · 6 answers · asked by jan 2

What is the square foot?

Theater: 54,144 Square Feet
Theater ???? Square foot

2007-07-22 16:09:37 · 6 answers · asked by Jason252 2

2007-07-22 16:09:18 · 12 answers · asked by brickcity_da 1

If * is a binary operation on a set S, an element x of S is an idempotent for * if x*x=x. Prove that a group h

2007-07-22 16:08:03 · 2 answers · asked by Alberto M 2

Exponents can be used with the numbers 1,6, 7, 8

2007-07-22 16:06:47 · 2 answers · asked by jatin b 1

2007-07-22 16:04:51 · 3 answers · asked by Anonymous

If * is a binary operation on a set S, an element x of S is an idempotent for * if x*x=x. Prove that a group has exactly one idempotent.

2007-07-22 15:57:22 · 2 answers · asked by zp33 1

Suppose that statisticians determine that there is a significant positive correlation between the grade earned in the class College Reading Skills and the grade earned in Statistics. Does achieving a high grade in reading cause an individual to earn a high grade in Statistics? Explain your answer with reference to the term lurking variable.

2007-07-22 15:57:12 · 1 answers · asked by Anonymous

OK... so lets say i'm playing poker against my friend. We are both dealt two cards which only we can see. Then 3 cards are dealt which we can both see. If two of the community cards are kings, does it make it less likely that my friend has a king?

2007-07-22 15:52:41 · 7 answers · asked by Chris tf 2

ahemz.

FINDING THE SLOPE*

can sumone write me out a proper solution with work for
3x - y = 4?


much thanks!

2007-07-22 15:49:32 · 10 answers · asked by ◆CносоCат◆- - - 2

A test rocket follows a parabolic path. Its path is followed by two tracking stations. A & B. On a grid system, the launch pad is at (0,0). The tracking stations are on the horizontal axis. Station A is 4.5 KM from the launch site and station B is 7 km from the launch site.

The tracking stations record two measurements: the first, station A records an angle of 78.2 degrees and station B records an angle of 67.4 degrees, the second places the rocket at the co-ordinates (10,20) on the parabola.

***Find the EQUATION of the flight path. Find how FAR from the launch site the rocket lands***

I need ALL the steps to finding this answer, I need it for tomorrow!!!

2007-07-22 15:49:23 · 3 answers · asked by Anonymous

Let A and B be sets. Show that

A - B subset A

How would I do that? I been trying to figure that out for a while now. Thanks!

2007-07-22 15:33:11 · 1 answers · asked by ddw4e 2

I've heard that people that are generally good at maths are good at music. Is this true? What you people think of this?

2007-07-22 15:32:33 · 1 answers · asked by thugster17 2

I need to self teach myself statistics to write my thesis paper for school. My professors are not helpful and I have no books or resources since I am studying overseas. I have the new version of SPSS and have read the help manual. Also, I have used the UCLA statistics help websites. Does anyone know some good online resources to help me learn? I am having the most difficulty figuring out how to analyze my data with the appropriate measurement tools. Example-use t-tests or chi square tests or ANOVA etc. Any help would be greatly appreciated

2007-07-22 15:26:16 · 2 answers · asked by chibagrll 1

my exam is tomorrow, please help me out with this review question!!!

The diameter of a car's tire is 50cm. While the car is being driven, the tire picks up a nail.

a) Model the height of the nail above the ground in terms of the distance the car has travelled since the tire picked up the nail.

b) How high above the ground will the nail be after the car has travelled 0.5km?

c) The nail reaches a height of 10 cm above the ground for the 6th time. How far has the car travelled?

d) what assumption must you make concerning the driver's habits for the dunction to give an accurate height?


SHOW UR WORK PLEASE :(:(: :( :(

2007-07-22 15:25:21 · 1 answers · asked by mystery_girl07 2

Find the value of the linear correlation coefficient r for the paired data below which consists of the test scores of 6 randomly selected students and the number of hours they studied for the test. Hours 5 10 4 6 10 9 Score 64 86 69 86 59 87



a. 0.678

b. 0.224

c. - 0.678

d. - 0.224

2007-07-22 15:24:12 · 3 answers · asked by Anonymous

I heard a while back, I dont know if its true or not, that division by a negative is "technically" not allowed.

Mathematically, you have to move the negative factor (-1) from the denominator to the numerator before dividing. Its algebraically the same exact thing and produces the same result... one can get away with not even consciously thinking about it. But the rule exists because it matters in higher level mathematics like number theory and whatnot.

Is this true? What do the rules of mathematics actually say about this... about division by negative values?

Likewise, what other odd caveats apply to mathematics that people dont often think about but can easily get away with ignoring?

2007-07-22 15:15:22 · 2 answers · asked by Anonymous

Highways surfaces are constucting with a roughly parabolic shape. This makes the centre of the raod higher than the sides so the water will drain off the road onto the shoulders.

In this problem the road is 7.6 m across. A cable is embedded in the road 156 cm from one side and the road is 9.4 cm thick at this point.

Find the equation of the parabola. find the MAXIMUM height of the road.

(the numbers in this problem may be very small, so your answers may be accurate to 7 decimal places)

If someone can please help me out it would be great, I must know all the necessary steps to completing this problem. Please show me all the steps!

Thanks,

2007-07-22 15:13:16 · 1 answers · asked by Anonymous

Two equations:
x^2 / (1+x^2) and rx-s where r>0 and s>=0
Is there a way to find out in which cases they intersect 1,2, or 3 times in terms of r and s without dealing with a nasty cubic equation?

2007-07-22 15:02:24 · 1 answers · asked by tzz1985 2

2007-07-22 14:55:23 · 7 answers · asked by Travell B 1

Given the regression line of y-hat = 1.46x + 17.46 and y-bar = 54 where x is the population and y is the monthly sales, calculate the residual for a city of population of 10 thousand whose monthly sales are 40 thousand.

a. 7.94

b. -7.94

c. 63.04

d. 32.06

2007-07-22 14:40:42 · 3 answers · asked by Anonymous

PROBLEM SOLVE:
x² -6x = 216

I know how to factor it's just that 216 is a big freaking # I can't break it down, and even more harder is when I ever I get a number that matches I need to subtract so I can get "6" IMPOSSSIBLE!

2007-07-22 14:32:05 · 12 answers · asked by Anonymous

2007-07-22 14:26:53 · 9 answers · asked by Jason C 3

Also, is there a website that lists all of the known prime numbers?

2007-07-22 14:19:35 · 6 answers · asked by Anonymous

1)2p-3r +t for p=10 r=-4 and t=5

2)p^2-r^2 for p=10 r and t=5

2007-07-22 14:19:02 · 8 answers · asked by percy m 1

how can i graph this? /or solve it?

2007-07-22 14:14:10 · 3 answers · asked by Anonymous

2007-07-22 14:13:06 · 13 answers · asked by Anonymous