Mathematics - 7 November 2007

Find the value of x when y = 75.

Please could you give answer and help me out how to do it?

Many thanks

2007-11-07 06:20:05 · 5 answers · asked by Anonymous

help ! (round to your nearest tenth)
1. 747.32
2. 525.008
3. 301.44

2007-11-07 06:13:21 · 3 answers · asked by I walk,my walk & Talk,my talk 3

a)y=cos(3x) from x=0 to x=pi/6 about the x-axis

b)x=(1/9)(y^2 + 6)^(3/2) from y=1 to y=6 about the x-axis

c)x=sqrt(2y-y^2) from y=10/16 to y=17/16 about the y-axis

how do you go about doing these types of questions

2007-11-07 06:08:40 · 2 answers · asked by Anonymous

find a number in which the sum of the number is a minimum

2007-11-07 06:06:31 · 3 answers · asked by Chrisso 2

2007-11-07 05:53:53 · 2 answers · asked by Anonymous

Let's consider a triangle, ABC. Let's fix the points H and K on AB, and the points H' and K' on AC.
Let's link B to H and K, and C to H' and K', by segments: now, several triangles are obtained.
Does anyone know a formula to calculate the exact number of them? Could that formula give the right answer even in case of more than 2 points, fixed on AB and AC?

2007-11-07 05:51:07 · 1 answers · asked by Io S 2

How do I set this up, and can someone please walk me through the steps?

Lane invested $10,000, part at 15% and part at 14%. If the total interest at the end of the year is $1,430, how much did she invest at 15%?

2007-11-07 05:45:10 · 2 answers · asked by smiles4u 3

x^2+x+ *sqrt*[x^2+x] - 2 = 0

Am I to just arrange the data like this?

x^2 + x - 2 = - *sqrt* [x^2 +x]

2007-11-07 05:43:21 · 2 answers · asked by Anonymous

how would i graph f(x)=-2log(x+5) without using a graphing calculator? how do i find the domain and range? can someone explain it to me clearly. is the domain {x\ x<4}?

2007-11-07 05:41:56 · 2 answers · asked by Anonymous

Find the Y intercept the eqyation of the axis of symmetry x coordinate of the vertex. Make a tabel of values that includes the vertex, and graph it??

2007-11-07 05:36:16 · 8 answers · asked by Anonymous

find x:(a)3:2=5:x
b)4:3=x:4
c)x:7=1:2
and

find each ratio in the form 1:n,giving n to 3 significant figures where necessary:
a)25:10000
b)2:15

please can you tell me how you got the answers and tell me the workings.Thank you.

2007-11-07 05:30:34 · 5 answers · asked by Anonymous

(x^2y^-2/z^-2)^-1

2007-11-07 05:29:27 · 4 answers · asked by Anonymous

2007-11-07 05:28:19 · 8 answers · asked by Anonymous

Hey, I've got a math test on Friday and I can't figure out how to find the area of a cardioid by double integration. The instructions for the problem read: Find the indicated area by double integration in polar coordinates. And the problem is 3. The area bounded by the cardioid r=1+cos(theta) . Thanks in advance.

2007-11-07 05:25:09 · 2 answers · asked by Anonymous

Could someone please help me with this one math question please?? Describe a process for finding the measure of angle 2. here is a picture of what I'm looking at..

http://i24.tinypic.com/33vhukh.jpg

2007-11-07 05:07:01 · 8 answers · asked by Anonymous

if any one could solve this i will be happy if he / she write all the steps ... :)

2007-11-07 04:59:14 · 1 answers · asked by Anonymous

(x-10)(x-2)= -20

I am getting as far as

x^2 - 12x +20 = -20

x^2 -12x + 40 = 0

2007-11-07 04:53:37 · 7 answers · asked by Anonymous

three 7 lb. 12 oz
1. 19 lbs.
2. 21 lbs. 12 oz.
3. 23 lbs. 4 oz.
4. 23 lbs. 12 oz.

2007-11-07 04:28:09 · 24 answers · asked by Anonymous

I've been working on this problem for like 3 hours, and cannot figure it out. i can do every problem on the page EXCEPT this one. help please lol...

give all positive values of the angle between 0 and 360 degrees to satisfy the equation:
cos2x - sin^2 x/2 + 3/4 = 0

please show me how you did it so I know for future. thanks tons.

2007-11-07 04:23:32 · 4 answers · asked by Fundamenta- list Militant Atheist 5

dollars when t = 0 and t is time in years. Suppose Q =1. How fast (in cents/year) are prices rising when t = 10?

2007-11-07 04:08:23 · 2 answers · asked by simonkf2002 1

*square root*[7x + 29]= x+3

2007-11-07 04:00:52 · 4 answers · asked by Anonymous

The text reads: In 1967, females constituted 13 percent of all juvenile index crime arrest; today they make up about one third. Can someone please do the math for me b/c i dont know.

I guess the question is asking what is one third of 13

2007-11-07 03:57:42 · 2 answers · asked by pete 1

What is the mean for the following questions?

1.whats the mean for: 43 41 39
2.whats the mean for: 56 57 52
3.whats the mean for: 41 46 45



Many thanks!!!

x-x-x

2007-11-07 03:24:14 · 15 answers · asked by Shake&Bake Baby 2

prove that Lt x->0+ [sinx /x] is 0
and Lt x->0+ [tanx /x] is 1 where [.] represents Greatest integer function.

2007-11-07 03:17:19 · 3 answers · asked by Anonymous

Consider all five-digit numbers formed by using the digits 1, 2, 3, 4, and 5 once and only once in each number formed. What is the sum of all of these five-digit numbers?

2007-11-07 03:17:09 · 11 answers · asked by Anonymous

x squared - 14x +49

2007-11-07 03:12:37 · 7 answers · asked by Mark B 1

prove Lt x->inf. cuberoot{(a+x)(b+x)(c+x)} -x is (a+b+c)/3

2007-11-07 03:09:15 · 2 answers · asked by Anonymous

1. a sum of £10,000 is invested at 6% for one year. Determine the value at the end of year if interest is compouned.
2.1 quarterly (every 3 months)
2.2 monthly
2.3 Weekly




2. a sum of £150 is placed at the beginning of each month in an account with an annual interest rate of 6%, compounded monthly. How much money is there in the account at the end of the first year?(clarification: at the end of the first year’ means that 12 payments have been made. The 13th payment has not been made yet)

3. you have just won £ 4000,000 in the lottery, in order to collect the money. You must choose one of the following two options: a) the whole amount right now, or b) 500,000 a year for ten years. The first payment starting exactly one year from now, assuming that annual interest rates r 5% and compounded annually, which option is best? Use the concept of present value to estimate how much option b) is worth to you right now.

4. a monopolist faces a demand function D(p) = √1-P², where p is price,
5.1 calculate the marginal revenue as a function of price. Then find the price that maximises revenue.


5.2 suppose that price is increased from p=0.1 to p=0.2, by how much does revenue change? Compare your answer with an estimate based on a linear approximation of the revenue function at p=0.1


5, for each of the following functions, find and classify the critical points. And the global maxima and minima if they exist, then sketch the function.
6.1 f(x)= x³ -18x² +33x +150. with X>=0;
6.2 g(x) = x³-18x²+33x + 150 0<=x<=12;
6.3 h(x) =(a²-x²)3/2. with –a<=x<=a and a a given real number

2007-11-07 03:07:53 · 1 answers · asked by naughty d 1

go onto this site and do problem number 8
http://www.hamilton.ie/mathschallenge/Wk3.htm

2007-11-07 03:04:25 · 3 answers · asked by irish dubliner 2

2007-11-07 03:00:37 · 4 answers · asked by SeXxY&SmArT 2