Mathematics - 19 October 2007

What do I do?

2007-10-19 11:46:34 · 12 answers · asked by Anonymous

Is there a differential equation to predict the dynamics of stock market?

2007-10-19 11:43:07 · 2 answers · asked by BenL 2

A carousel has a radius of 17 feet and takes 28 seconds to make one complete revolution. What is the linear speed of the carousel at its outside edge? Express the answer in feet per second. If neccessary, round the answer to two decimal places.

a. 106.81
b. 10.35
c. 0.61
d. 3.81

2007-10-19 11:36:25 · 5 answers · asked by hana 1

Use linear approximation, i.e. the tangent line, to approximate
16.2^(1/2) as follow:

Let f(x)=x^(1/2). The equation of the tangent line to f(x) at x=16 can be written in the form of y=mx+b where m is:______. and where b is:______.

Using this, we find our approximation for 16.2^(1/2) is ______.

2007-10-19 11:21:54 · 2 answers · asked by Anonymous

2007-10-19 11:19:55 · 11 answers · asked by Anonymous

A company begins an advertising campaign in a certain city to market a new product. The percentage of the target market that buys the product is a function of the length of the advertising campaign. The company estimates this percentage as 1-e^-0.05t where t=number of days of the campaign. The target market is estimated to be 1,000,000 people and the price per unit is $0.40. The cost of advertasing is $1000 per day.
Find the length of the advertising campaign that will result in the maximum profit.

P.S. Please list all the steps taken to answer the problem. Im interested in learning also, not just getting the answer.

2007-10-19 11:19:08 · 2 answers · asked by Meloa 3

Prove without a calculator:
tan(50)*tan(25)*tan(75) - tan(75)+tan(50)+tan(25)=0

2007-10-19 11:14:47 · 4 answers · asked by Amir B 1

the college board reports 2% of the 2 million high school students who take the SAT each yr get special accomadations because of documented disablities. consider a random variable of 25 students who have tkaen the test
a) what is the probablity that exactly 1 recieved special accomadation?
b) what is the probablity that least1 recieved special accomadation?
c) what is the probablity that at least 2 recieved special accomadation?
d)what is the probablity that the number among the 25 who recieve a special accomodation is within 2 deviations of the number you would expect to be accomadated?
e)suppose that a student who does ot recieve a special accodadtion is allowed 3 hrs for the exam, where as an accomodated student is allowed 4.5 hrs. what would you expect the average time allowed the 25 students to be?

2007-10-19 11:10:33 · 3 answers · asked by LaShonde B 1

All three sides of the triangle have equal length. What is the perimeter. One side is 9x-4 and the bottom is 2(3x+4)?

2007-10-19 11:06:10 · 5 answers · asked by Donald C 1

Form an identity by completing the following equation.
4cos^2 t + 3sin^2 t =

Thanks for the help!

2007-10-19 11:02:43 · 6 answers · asked by sillyboys_trucksare4girls 2

1. The sum of three numbers is 301. The second number is 3 less than twelve times the first number. The third number is 4 more than seven times the first number. Find the three numbers.

I need to know how you get the answers also.

2007-10-19 11:01:31 · 5 answers · asked by Anonymous

If a figure is a parallelogram and has 4 right angles, then it is a rectangle.

Please explain whether it's true OR false.

Thanks. ( its for my math homework) =]

2007-10-19 10:34:02 · 3 answers · asked by Anonymous

2007-10-19 10:29:58 · 9 answers · asked by Anonymous

The number of pounds of
milk, M, required by a calf weighing x pounds can be estimated by the formula


M = -5 + sqrt(6.7x - 444)

Estimate the number of pounds of milk required by a calf with a weight of 300
pounds.

2007-10-19 10:01:40 · 2 answers · asked by Anonymous

sqrt(2x + 3) - 5 = -2

2007-10-19 10:00:19 · 5 answers · asked by Anonymous

radicands represent positive real numbers.


sqrt(5a) + sqrt(45a^3)

2007-10-19 09:55:24 · 2 answers · asked by Anonymous

radicands represent positive real numbers.


cube root(27) - 5*cube root(8)

2007-10-19 09:54:28 · 1 answers · asked by Anonymous

Date Sufficiency, decide and explain if the statements 1 or 2 or independently sufficient/insufficient to answer the problem, or need each other for sufficiency, or both wont work

the daily news has 25 reporters covering asia, 20 covering europe and 20 covering north america. 4 reporters cover asia and europe but not north america. 6 cover north america and asia but not europe. 7 cover north america and europe but not asia. how many reporters cover all 3 continents.?

Statement 1. Daily News has 38 reporters in total covering at least 1 of the following continents, asia, europe and north america.

Statement 2. there are more daily news reporters covering only asia than there are daily news reporters covering only north america.


thats a mouthful guys, im having problems with this one... some great minds are requested to explain this one.... thank you in advance.

2007-10-19 09:53:52 · 1 answers · asked by mandeep s 1

3u2 = 8u – 5

2007-10-19 09:51:47 · 7 answers · asked by Anonymous

3/x
(x - 1)/x^2

2007-10-19 09:47:29 · 3 answers · asked by Lu Y 1

2007-10-19 09:44:33 · 3 answers · asked by Lu Y 1

Best responses receive 10 Points

I need help with these problems. I've worked them out on my own and still had difficulties with them. Serious resolution.

Reduce answers to lowest terms


1.) 3/5 + 1/3



2.) 3/5 - 1/3


3.) 3/5 x 1/3


4.) 3/5 divided by 1/3



5.) 1/3 + 5/6

2007-10-19 09:39:57 · 7 answers · asked by ione_thestar1 4

Also what is the square root of i and the square root of -i.

2007-10-19 09:38:24 · 13 answers · asked by Anonymous

What does this symbol mean in math ^ on the computer?

I need help in solving these problems as follows:

Reduce answers to lowest terms

1.) 2 11/12 - 1 13/18



2.) 3/8 x 2/3 divided by 4



3.) 3/2 x 1/3 x 4/5



4.) 3/2 x 1/3 divided by 4/5



5.) 3/2 divided by 1/3 + 4/5



6.) (3/2 +1/3) x 4/5

2007-10-19 09:27:27 · 9 answers · asked by ione_thestar1 4

what is s s - 4 over 7 = negative 2 over 3.

what is m negative 7 over 8 + m = negative 2 over 5

what is f 5 over 12 + f = negative 2

these dont make any sense but if you can answer them then do it please

x / a = b and ax= b

2007-10-19 09:11:21 · 3 answers · asked by bobthebuilder 1

What is the smallest prime number? Is it 1 or 2?

2007-10-19 09:10:22 · 18 answers · asked by Anonymous

I have a test on Monday on this stuff and these were the questions on last years exam. Can someone help me with these please?! Thanks!

1.) A circle C has center at the origin and radius 7. Another circle K has a diameter with one end at the origin and the other end at the point (0,19). The circles C and K intersect in two points. Let P be the point of intersection of C and K which lies in the first quadrant. Let (r, theta ) be the polar coordinates of P, chosen so that r is positive and 0 is less than or eq to theta whis is less than or eq to 2. Find r and theta.

2.) A curve in polar coordinates is given by: r = 12 + 3 cos theta.
Point P is at theta = (27pi/24)
a.) Find polar coordinate r for P, with r > 0, pi < theta < (3pi/2)
b.) Find cartesian coordinates for point P.
c.) How may times does the curve pass through the origin when 0< theta , 2pi ?

2007-10-19 09:06:53 · 3 answers · asked by Anonymous

how to factor this?

-x^2 + 3x -2

2007-10-19 09:01:46 · 9 answers · asked by tmlfan 4

g(x)=x^2-2x-15

2007-10-19 08:57:01 · 2 answers · asked by Anonymous

2007-10-19 08:49:35 · 4 answers · asked by curioussss 1