Mathematics - 9 December 2007

Consider the surface and solid of revolution of function y = √(2x-x²). From x = 0 to x = a, a > 0, the total volume is 0. What is the surface area?

2007-12-09 07:24:44 · 4 answers · asked by Scythian1950 7

2ln(3x-4)=7
please help me with this and explain it step by step if you don't mind.

2007-12-09 07:18:12 · 3 answers · asked by ashtreylil 3

I'm getting confused about which is which because people refer to each system differently. Can you please explain to me which system uses what units?

2007-12-09 07:13:13 · 5 answers · asked by Anonymous

2007-12-09 07:09:10 · 14 answers · asked by rachel 1

QUESTION #1

Four stamps can be attached to each other in various ways. One way is shown here. In how many other ways might four stamps be attached?
☺ ☻ ♥ ♦ <-- Stamps.

QUESTION #2

What is the greatest amount of money you can have (in pennies, nickels, dimes, quarters, and half dollars) and still not be able to give change for a dollar?

QUESTION #3

It takes 4 and a half hours for a jet to fly from coast to coast. One jet leaves Los Angeles for New York at 4:40 p.m. while another jet leaves New York for Los Angeles at 6:00 p.m. Which plane will be closer to New York when they pass each other?

Thanks :)

2007-12-09 07:07:07 · 2 answers · asked by apples. 4

Solve by factoring.
Can someone please explain this to me step by step.
Thank you! I'm studying for my NYS Math Regents!

It reads: Two over x plus x plus two over x plus one is equal to seven over two.

2007-12-09 06:58:13 · 4 answers · asked by musicgirl 1

How do you solve this problem using elimination:

-3x+4y=29
3x=2y=-17

2007-12-09 06:52:50 · 8 answers · asked by holly 2

Mr. Petri has a rectangular plot of land with length=20 ft and width=10 ft. He wants to design a flower garden in the shape of a circle with two semicircles at each end of the center circle. He will fill in the remaining area with wood chips. If one bag covers 5 square ft, how many bags must he buy?

2007-12-09 06:49:55 · 1 answers · asked by I LOVE NEW YORK 1

-5^2

I'm not sure if it's -25 or 25, but my calculator says -25 but when i did the process of (-5)(-5) and it turns out to be 25, so idk if it's the positive or negative one =/

2007-12-09 06:43:40 · 2 answers · asked by hpdc90 1

A right circular cylinder is to be designed to hold 20 cubic inches of soft drink. The cost of the material for the top and bottom of the can is twice the cost of the material of the sides. Let r represent the radius and h the height of the cylinder. a.) Write the equation for the surface area SA in terms or r and h. b.) Write the cost function C. c.) Write the cost function as a function of one variable, r. d.) Find the radius that minimizes cost. Thank you, I'm really confused on these minimization/ max problems. Please explain each step.

2007-12-09 06:33:59 · 1 answers · asked by cason90 1

for my algebra and trig class

2007-12-09 06:30:15 · 4 answers · asked by clawznpawz89 1

Please, Show steps. (I am trying to firgure out what I am doing wrong). Thanks

2007-12-09 06:29:19 · 6 answers · asked by Sam Dali 2

I must be way behind in math and need to bone up.

2007-12-09 06:26:44 · 7 answers · asked by Neomaxizoomedweebie 3

2007-12-09 06:21:04 · 4 answers · asked by suzii jane 1

ln (x/e^x)

2007-12-09 06:21:01 · 5 answers · asked by Anonymous

(1+sec x)/(tan x+sin x)=csc x

2007-12-09 06:17:58 · 1 answers · asked by eman k 1

simplify 12x+2x^3y/4xy

2007-12-09 05:59:59 · 4 answers · asked by lyme_aide 1

2007-12-09 05:57:09 · 2 answers · asked by Anonymous

The area of a parallelogram can be found by multiplying the distance between two parallel sides by the length of either of those sides. Explain why this formula works.

thanks

2007-12-09 05:52:44 · 5 answers · asked by zzzz42 2

pi=3.1415...
i= complex number show work the 3 solutions.

2007-12-09 05:35:51 · 1 answers · asked by MarioS 2

The points are: (1,4), (4,22), and (10,112)
The equation is: ?

Thanks!

2007-12-09 05:26:15 · 2 answers · asked by Anonymous

2007-12-09 05:24:53 · 14 answers · asked by bornleader79 2

A conical tank has a radius of 5 ft and a height of 10 ft. Water runs into the tank at the constant rate of 2 cubic feet per minute. How fast is the water level rising when the water is 6 ft deep?

2007-12-09 05:19:14 · 1 answers · asked by burgler09 5

What does it mean in Calculus when they say; find the derivative of this function using the definition. What is the definition? (I'm sure I have learned it but I can't remember what it is) A simple example would help a lot.

2007-12-09 05:16:41 · 2 answers · asked by Anonymous

I just don't know how to do it. I've worked out the gradient is 1.4, so I guess is it 1.4x + by +c? The line goes through 8, 2.
Can someone please explain how to do it? A-level maths mock tomorrow :/

2007-12-09 05:13:51 · 1 answers · asked by Jethro 5

2007-12-09 05:13:17 · 2 answers · asked by Answer Seeker 1

I recently asked my Maths teacher what he though 1/0 was. He told me it was infinity. I didn't beleive him but most other Maths teachers say the same thing. I can see why they could think this, since if you divide 1 by a smaller and smaller number the result increases. Since 0 is the smallest possible number, the result will be the biggest possible number, infinity.

However, most americans that I know (I'm english) think the opposite, they think the answer is either undefined or 0. I agree.

I would like to know the worldwide mathmetician's opinion on this matter, if there is one.

P.S. I've asked 'Dr Math'(google it) about this and it gave me no straight answer.

2007-12-09 05:09:33 · 4 answers · asked by blank 4

Help

2007-12-09 05:07:12 · 5 answers · asked by qutgal 1

how long is the diagonal of a square that has an area of 1000 square centimeters? express your answer as a decimal to the nearest tenth. I came up with .5cm is that correct?

2007-12-09 04:52:54 · 9 answers · asked by sheba40 1

six friends commute to work together.Each week,the gas,parking and tolls cost $114.If they split the costs equally,how much does each friend pay per week toward the commuting costs?

(1) $17

(2) $18

(3) $19

(4) $108

(5) $120

2007-12-09 04:52:38 · 5 answers · asked by Anonymous