Mathematics - 3 November 2007

Base the approximation at x= -2pi/3

2007-11-03 08:42:18 · 1 answers · asked by diecast 3

i have a question on my homework that asks me to write an equation to an ellipse when i know the major axis, which is 6 and the foci being at (0, +/-1)

everytime i solve it and i try to find out what b^2 is i keep getting some really wierd decimal and negative number.
so far i have

x^2/? + y^2/9=1

i just cant figure out how i can find b^2
please help!

2007-11-03 08:38:20 · 1 answers · asked by piper h 1

Find the equation of the line tangent to the curve defined by the equation at the specified point.
x^(2/3)+y^(2/3)=2; (1,1)

2007-11-03 08:34:35 · 1 answers · asked by Matty B 3

2007-11-03 08:10:39 · 6 answers · asked by Anonymous

Full Question:
http://img155.imageshack.us/img155/9779/14336347bq9.gif

This one seems pretty tricky to me atleast

2007-11-03 08:01:09 · 2 answers · asked by jay d 1

You are organizing a three-day back-country ski trip to Roger’s Pass for students in an outdoor club at St. Mary's College. You have approached two local busing companies for group cost information. The companies have presented you with their cost proposals for round-trip group travel:

Company A: $55 per person for a group of up to 40 students

Company B: $60 per person for a group of up to 25 students, with a discounted rate of $45 per person for each additional person in larger group size of between 25 and 40.

Let x denote the number of students who are considering participating in this trip. Let the function A(x) represent the total cost of the trip with company A and let B(x) represent the total cost of the trip with company B.

a)Determine the algebraic formulas for A(x) and B(x) for a domain of [0, 40].

b)For what value of x (number of students traveling) is the total cost the same for both companies?

2007-11-03 07:59:04 · 2 answers · asked by sweet_pomelo 2

6n^2-23n+7

thanks

2007-11-03 07:48:06 · 5 answers · asked by Anonymous

numerous studies shown that IQ scores have been increasing, generation by generation, for years. The increase is called Flynn Effect, and the data indicate that the increase appears to be about 7 points per decade. To demonstrate this phenomenon, a researcher obtained an IQ test that was written in 1980. At the time, the test was prepared, it was standardized to produce a population mean of 100. The researcher administers the test to a random sample of N=16 of today's highschool students and obtains a sample mean IQ of M=121, with a squared standard deviation of 6000.

Is this result sufficient to conclude that today's sample scored significantly higher than would be expected from a population with a mean 100? use a one-tailed test, with alpha level of .01

2007-11-03 07:46:10 · 1 answers · asked by Anonymous

Solve by factoring:

2x^2 - 6x = 0

Thanks

2007-11-03 07:45:35 · 8 answers · asked by lexismom2005 1

Suppose that G is a group with more than one element and G has no proper, nontrivial subgroups. Prove that |G| is prime. (Do not assumeat the outset that G is finite.) Show all your setp

Thank you

2007-11-03 07:20:36 · 3 answers · asked by Lole E 1

Okay... so I get the jist of factoring...blablabla BASIC

But yea, need help with two problems

How to factor:

(x-1)3 - (x-1)2 (that is (x-1) to the third - (x-1) to the second)

and

(z-4)3-4(z-4) (that is z-4 to the third minus 4 times the quantity x-4

HELP!!!

2007-11-03 07:11:12 · 4 answers · asked by softballanimechick124 2

Use differentials to estimate the maximum error in the calculated surface area. Estimate the relative error in the calculated surface area..
The circumference of a sphere of radius r is c=2(pi)r, and its surface area is A=4(pi)(r^2). Eliminate r first! I did eliminat r from crcumference and then found derivative , but the answer is not what i am geting. PLease help

2007-11-03 07:03:59 · 3 answers · asked by Amer 1

answer is 4^15- 4C1.3^15+4C2.2^15-4C3.1^15
please explain the logic

2007-11-03 07:00:50 · 5 answers · asked by mathiphy 2

A small model airplane motor has 4 starting components: key, battery, wire, and glow plug. What is the probability that the system will work if the probability that each component will work as follows: key (0.998), battery (0.997), wire (0.999), and plug (0.995)?

2007-11-03 06:30:19 · 8 answers · asked by Jerry M 1

A basket contains 34 heads of lettuce, 5 of which are spoiled. If a sample of 2 is drawn and not replaced, what is the probability that both will be spoiled?

2007-11-03 06:27:22 · 4 answers · asked by Jerry M 1

For a project i need to name two non euclidian geometries and have no clue please help thanks.

2007-11-03 06:25:24 · 6 answers · asked by tom s 2

2n^2= -1+6n

2007-11-03 06:13:26 · 8 answers · asked by Anonymous

a circle has the equation, x^2 + y^2 - 12x - 6y + 20 = 0 express x^2 + y^2 - 12x - 6y + 20 = 0 in the form (x-a)^2 + (y-b)^2 = r^2

find the coordinates for the centre of the circle

find the radius of the circle

2007-11-03 06:01:37 · 4 answers · asked by Anonymous

In a certain sequence of numbers, each term after the first term is 3 times the preceding term. If a and b are two terms in this swquence and if a / b is 27, how many terms are there between a and b, not including a and b?

In the right triangle ABC above, y/3=3/x + y. What is the value of y?

Right Triangle ( Hypotenuse facing the bottom.) (Base is 3 on the right)(Height is 4 on the left) ( Right angle on the top is making a altitude to the bottom making a point D and a right angel to the left.) Now There should be 2 triangles connecting to each other first one on the left is ABD 2nd is BDC.

So far im guessing that triangel BDC should be a right triangel as well

2007-11-03 05:30:32 · 2 answers · asked by Anonymous

2007-11-03 05:25:54 · 3 answers · asked by sathi 2

my math teacher told me if i get this write then he'll give me extra points :
he said if i can give him da stepz of drawing an inscribed circle in a scanlene traingle , not onlly to draw it but also to explain how did u drew this figure , any help plzz !!!

2007-11-03 05:08:48 · 3 answers · asked by beni 1

someone please help me with these math problems on percentages.
1) By giving a discount of 30%, a trader makes a profit of 20%. If the trader had given a discount of $400, he would have incurred a loss of 20%. Find the marked price(price before discount) of the article.
2) A bag contains balls of 3 different colors-red,blue and green. The number of blue balls is 12.5% lesser than the number of red balls and 40% more than the number of green balls. By what percent is the sum of the blue and green balls less than the sum of the red and blue balls?

I want the explanation if possible.. just the answer wont help.
Thanks in advance.

2007-11-03 05:05:21 · 3 answers · asked by Anonymous

3x^2-10x-10=0

I get x=4.13 and x=-0.81 when I enter this in my calculator
I think this problem requires you simpifly the radical once you input the values in the quadratic formula but I am unsure how to do that in this question to get the answer the calculator shows.

2007-11-03 04:55:04 · 4 answers · asked by Anonymous

Solve by completing the square:

2x^2 - 7x -15 = 0

Thanks!

2007-11-03 04:39:59 · 7 answers · asked by John 1

the fox polulation in a certain region has a relative growth rate of 7 percent per year. it is estimated that the population in the year 2000 was 29300.
find a function that models the population t years after 2000 (t=0 for 2000)_____________________________
use that function to estimate the fox population in the year 2008.
this answer is in integer._______________________

2007-11-03 04:35:40 · 6 answers · asked by star baller 360 5

..that OA+OB+OC = OAm + OBm + OCm
where OA,OB,OC,OAm,OBm,OCm are vectors.
and O is an arbitrary point.

How should you draw this, and then how to show it?

2007-11-03 03:52:56 · 7 answers · asked by droids_are_beautiful 1

factor the quadratic expression completely and find the roots of the expression.

1. 135x^2 - 222x + 91

2. 6x^2 - 42x + 72

Completing the square. Find the roots of the quadratic equation.

3. x^2 - 3x = 0

2007-11-03 03:42:13 · 5 answers · asked by Hope C 1

Divide:

Divide: (4x^3 + 8x)/(3x) / (4x^2 + 8)/(6x^2)

Thanks for helping me with this!

2007-11-03 03:35:55 · 5 answers · asked by John 1

2007-11-03 03:32:24 · 14 answers · asked by J S 2

what is this: 12x(square)+43x-20

2007-11-03 02:54:42 · 4 answers · asked by Anonymous