Mathematics - 16 December 2007

2007-12-16 10:47:36 · 4 answers · asked by zoe13faye 2

it says write the equation of a line with a slope of -4 that passes through the point of (-3, 5) ?

This is what i got, is it right ?

y-5=-4(x-(-3))

if not , please explain. thanks

2007-12-16 10:40:45 · 5 answers · asked by dark_princess 4

2007-12-16 10:26:17 · 11 answers · asked by Anonymous

im stuck

2007-12-16 10:24:00 · 3 answers · asked by Anonymous

4(t + 5) = 7 – 3t

2007-12-16 10:23:48 · 4 answers · asked by Diamond E 1

If you are right 85% of the time, what is the probabilty of being wrong at least 1 time out of the next 7?
If someone can please tell me how to do it? This has been the only part of the entire book i havent been able to understand! :(

Thanks

2007-12-16 09:57:46 · 4 answers · asked by Epiphany 6

Let f(x)=x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1. What is the numerical remainder when the polynomial f(x^16) is divided by the polynomial f(x).

2007-12-16 09:57:41 · 1 answers · asked by Quagmire77 1

A barrel has the shape of a cylinder, with top and bottom present. What is the maximum volume of the barrel that can be made using one square of material?

2007-12-16 09:56:44 · 1 answers · asked by swimmertommy 1

In Portland, Maine, the tide causes the ocean's height to vary sinusoidally, peaking every 12.4 hours. The average high tide (the difference between the height at high and low tides) is 2.7m. Find an equation for the height, h, of the tide as a function of the time, t, in hours of if h = 0 at time t = 0.
Plz elaborate on how you solved it.
Also show all work that you did.
THANK YOU VERY MUCH!

2007-12-16 09:56:23 · 1 answers · asked by needsomuchHELP! 3

I need to know where I messed up and how to get the right answers for the center, foci, major & minor axes.
The Original Equation:
36x^2 - 100y^2 - 72x + 400y = 3964
Factored:
18(2x^2 - 4x) - 100(y^2 + 4y) = 3964
After I add (-4/2)^2 and (4/2)^2 to the left side and 36 & -200 to the left:
18(2x^2 - 4x + 2) - 100(y^2 + 4y + 2) = 3964 + 36 -200
After I divided by 3800 on both sides:

(x-2)^2 - (y+2) = 1
----------- -----------
100 9

Last Format:

(x-2)^2 - (y - (-2))^2
---------- -------------- = 1
10^2 3^2

So I got a=10 b=3 h=2 and k= -2
So for the center = (2,-2)
Foci Points = (2-sqrt(109), -2) & (2+sqrt(109), -2)
and the major and minor axises: 20, minor=6

WHERE DID I GO WRONG???

I realize it seems like a lot, but it would mean so much. I finally thought I was getting math and everything "went wrong". I overlooked it myself more then 10 times and didn't catch anything. Please, I beg of you, explain what I did. Thank you very much!!!

Merry CHRISTmas!

2007-12-16 09:55:51 · 3 answers · asked by Anonymous

So I figure for 3 out of 5, you do 3/5 = .60, and then take that and do .60/.085, which would give you 70%. But how do I find the probabilty of being accurate extactly 4 tines in the next days? Thanks...

2007-12-16 09:53:27 · 2 answers · asked by Epiphany 6

Lim as n goes to infinity ( n +1)/(n*sqrt(n)) using sqz. them. please help.

2007-12-16 09:52:56 · 1 answers · asked by ramblingon4u 1

If f(x)=2/(x-3), find f'(4)________.


Use this to find the equation of the tangent line to the curve y=2/(x-3) at the point (4,2). The equation of this tangent line can be written in the form y=mx+b where m is:______
and where b is:________

2007-12-16 09:52:09 · 1 answers · asked by bunk212000 1

2007-12-16 09:50:46 · 5 answers · asked by Anonymous

Please help! How do I do this! Thanks so much in advance.

2007-12-16 09:48:32 · 8 answers · asked by Dana M. 3

I don't understand why my teacher has that the antiderivative of 1/(e^z) is -e^z.
Can someone please explain this to me?

2007-12-16 09:40:46 · 4 answers · asked by laulaukins 1

refer to this link for question:
http://img516.imageshack.us/img516/9867/18430669cx8.gif

2007-12-16 09:34:25 · 1 answers · asked by Anonymous

What is 1/4 of 12?

2007-12-16 09:16:46 · 3 answers · asked by Nena12 1

The diameter of a circle has endpoints at (-3,-4) and (5,0). Find the equation of the circle. Could someone explain how to do this problem?

2007-12-16 09:13:39 · 3 answers · asked by Anonymous

cot²x/(1 + csc² x) . To get the denominator to 1, what do I multiply by?

2007-12-16 09:12:00 · 1 answers · asked by Just Me 2

i dont know how to do this problem here it is:

a bicycle maker sold 300 bicycles last year at a profit of $300 each. The maker wants to increase the profit margin this year, but predicts that each $20 increase profit will reduce the number of bicycles sold by ten. How many $20 increases in profit can the maker add in and expect to make a total profit of $100,000?

if someone can solve it step by step and give explanations it would be more than appreciated

2007-12-16 09:04:37 · 2 answers · asked by Anonymous

A box contains nickels, dimes and pennies worth $8.40. The number of dimes is six less than twice the number of pennies and there is an equal number of dimes and nickels. How many nickels are there in the box? Type in your numerical answer only; do not type any letters or words with your answer.


Ok I got that...

d + p + n = 8.40
n = d


From there I dont know how to find the value of nckels...

2007-12-16 09:04:15 · 2 answers · asked by Tiffany R 1

1. solve x^(1/2) -6= -x^(1/4)

the answer is 16

2. find log3 (81)=?
logpie (1/pie cubed)
log1000 (10)

answers are 4 ,-3, 1/3

3. simplify completely

(x-6)/(x^2-4) - (x-1)/(2-x) - (x+1)/(x+2)

the answer is 3/(x+2)

Thanks for all help. God bless all and have a happy holidays!

2007-12-16 08:57:33 · 1 answers · asked by dreamz 4

Suppose that the length of time between consecutive high tides is approximately 12.5 hours. According to the National Oceanic and Atmospheric administration, on Saturday, June 28, 1997, on a certain beach, high tide occurred at 4:38AM (4.6333 hours) and low tide occurred at 11:08AM (11.1333 hours). Water heights are measured as the amounts above or below the mean lower low water. The height of the water at high tide was 8.5 feet and the height of the water at low tide was -0.9 feet.

Find a sinusoidal function of the form y = Asin(omega x - phi) + B that fits the data

2007-12-16 08:57:14 · 1 answers · asked by Anonymous

1. A person wants to make an rectangular enclosed play pen using 60 meters of fence. One of the sides is against the house (thus, not requiring any fencing). What are the dimensions of the play pen to get the maximum area?

2. A boat can go 12 mph in calm water. If the boat goes down a river 45 miles and back up the river 45 miles it takes him 8 hours. What is the current of the river?

2007-12-16 08:54:50 · 5 answers · asked by Anonymous

Im having trouble solving this:

Given an array a of integers and an integer x. The program SEARCH
searches for an occurrence of x in a. If x occurs in a, the result i is the
index of the occurrence. If x does not occur in a, the result i equals to
the size of the array.

2007-12-16 08:53:53 · 1 answers · asked by Anonymous

27. 2/*7*-*3* *-square root of
29. (3-2i)/(3+2i)
31. solve by completing the square: 4x^2-12x+7=0
32. Solve by using the quadratic formula: 9y^2+12y+5=0
33. Find the real values of k for which kx^2-6x+3=0 has two imaginary roots.

sorry it's a lot of problems to solve.. please solve the ones you can and include the work process too. thank you :)

2007-12-16 08:53:33 · 3 answers · asked by Anonymous

Consider the function f(x) = ex – kx, where k is a positive constant and x ≥ 0.

a. how do u Find all the critical points of f in terms of k.
b. how do u Find the anti-derivative F(x) satisfying F(0) = 3.

2007-12-16 08:52:49 · 1 answers · asked by Asiana 1

3y^3-2x^3-6x^2y+5y=0

I found dy/dx to be 6x^2+12xy/9y^2-6x^2+5, but if I set that to dy/dx to 0, I have 2 variables (x and y) to deal with. Any help would be great!

2007-12-16 08:52:02 · 2 answers · asked by ¿ /\/ 馬 ? 7

Each machine in a certain factory can produce 50 units per hour. The setup cost is $80 per machine, and the operating cost is $5 per hour. How many machines should be used to produce 8000 units at the least possible cost?

thanks

2007-12-16 08:51:48 · 1 answers · asked by Jason 2