Mathematics - 2 November 2007

The function f(x)=2x+2x^-1 has one relative minimum and one relative maximum. It is helpful to make a rough sketch of the graph to see what is happening.
This function has a relative minimum at.....
with value.......
and a relative maximum at........
with value ........

2007-11-02 13:53:57 · 3 answers · asked by Ksyha 1

I am trying to state the domain.

2007-11-02 13:36:38 · 5 answers · asked by franbi_1 1

2007-11-02 13:31:40 · 8 answers · asked by Tutor 1

A voltage V across a resistance R generates a current C = V/R. Suppose a constant voltage of 12 volts is put across a resistance that is decreasing at a rate of 0.2 ohms per second when the resistance is 6 ohms.
At what rate is the current changing?

2007-11-02 13:24:37 · 4 answers · asked by wildcat11 1

Use a differential to approximate sqrt 63.6 . Give your answer to at least 8 significant figures or use fractions to give the exact answer.

Hint: let f(x)=sqrt x and compute dy with x=64 and dx=-0.4

2007-11-02 13:20:43 · 1 answers · asked by Ksyha 1

Such as...

Pick a number
Multiply by 4
subtract 3
add 18
divide by 5
and so fourth

2007-11-02 12:52:03 · 2 answers · asked by #1 Yankee Fan 2

Alkaid, the most distant star in the Big Dipper, is 2.1 X 10^18m from the Earth. Approximately how long does it take light to travel from Alkaid to the Earth?

I took 10^18 which gave me 1,000,000,000,000,000,000... I timed this by 2.1 which gave me 2100000000000000000 Then I expressed it in scientific notation which gave me 2.1X17^18. Is this right??? The other answer that I got was 630880.79..Please help

2007-11-02 12:37:14 · 7 answers · asked by Amanda K 1

Sketch the plot of land described below and find its area to the nearest square unit:
From the intersection of 2nd Street and 3rd street, proceed N32 W for 350m along 2nd street, then S56 W for 300m to the football field, then S22 E until 3rd street is reached, and finally N68 E along 3rd street back to the starting point.

Sketch the diagram:
A plane flies at a bearing of 75 degrees from departure point A to point B at 350 mph for 90 minutes. At point B, the plane adjusts bearing to 125 degrees and flies at 325 mph for 1 hour to point C. Find the bearing the plane must follow, and the distance to travel from point C directly back to point A.

2007-11-02 12:34:27 · 1 answers · asked by devil_hell007 1

2007-11-02 12:28:15 · 4 answers · asked by Bobby S 3

There are 10,000 crew members standing around the edge of a ship. The Captain goes around and pushes every other crew member off starting with the first person. Who is the last person to get pushed off the ship.
Which number person survives?
Its isn't the captain...
Any ideas...if you know explain how you found the answer?

2007-11-02 12:28:02 · 7 answers · asked by Anonymous

Let X be a continuous random variable with density
f(x) = csinx for x ε (0,π) and f(x) = 0 elsewhere.

Compute c.

2007-11-02 12:17:45 · 2 answers · asked by cornzxo 1

give a simple way to factor a complete square

2007-11-02 12:09:56 · 1 answers · asked by jamdown 1

The speed of a stream is 5mph. A boat travels 5 miles upstream in the same time it takes to travel 15 miles downstream. What is the speed of the boat in still water?

2007-11-02 11:53:53 · 9 answers · asked by batty_starr 2

If In An Inner Product Space = for all x, show that u = v

2007-11-02 11:52:55 · 2 answers · asked by Anonymous

9604 aint right

2007-11-02 11:43:37 · 8 answers · asked by Anonymous

The weight W of an aluminum flatboat varies directly with the length L of the boat. If a 13-foot boat weighs 234 pounds, then what is the weight of a 12-foot boat?

2007-11-02 11:37:13 · 11 answers · asked by batty_starr 2

there is a bus with 7 girls, each girl carries 7 bags, inside each bag is 7 cats, every cat has 7 kittens, all cats have 4 legs, how many legs are on the bus... i need the answer to get a password to open an email attatchment... god do i need help..lol

2007-11-02 11:36:20 · 9 answers · asked by Anonymous

I have a problem that reads the following:

A rectangular tetrahedron has edges 36 units in length. What is the altitude of the tetrahedron? Give your answer in simplest radical form x sqrt y.

This is supposed to be a challenging problem, and though I'm in honors math, I haven't learned about these shapes. Please don't just give me the answer. Help to point in the right direction.

Thank you so much!

2007-11-02 11:36:03 · 2 answers · asked by Anonymous

The half-life of palladium-100 is 4 days. after 12 days a sample of palladium-100 has been reduced to a mass of 1 mg. what was the initial mass (in mg) of the sample?
________________________

what is the mass 7 weeks after the start?________________

2007-11-02 11:23:55 · 7 answers · asked by star baller 360 5

2007-11-02 11:22:20 · 8 answers · asked by !!Whoopie!! 2

2007-11-02 11:18:50 · 4 answers · asked by Anonymous

2007-11-02 11:17:30 · 11 answers · asked by RRMCPJ6 2

2007-11-02 11:05:38 · 4 answers · asked by batty_starr 2

Not asking for answers per say, just help getting the answers. Don't tell me to do my own homework because I did. I'm just double checking to make sure I followed the steps correctly.

http://img159.imageshack.us/img159/7733/01cl8.png

2007-11-02 11:04:35 · 3 answers · asked by Anonymous

2007-11-02 10:39:11 · 9 answers · asked by Anonymous

Can anyone give me a hint of how to do the problem "Saving Lunar Station Alpha" in the book Calculus Mysteries and Thrillers?

2007-11-02 10:01:20 · 1 answers · asked by Nick C 2

An item costs $200 at time t = 0 and costs $P in year t. When inflation is r% per year, the price is given by the following equation:
P= 200e ^ rt/100
a) If r is a constant, at what rate is the price rising (in dollars per year) initially? At what rate is the price rising after 2 years?

b) Now suppose that r is increasing by 0.3 per year when r = 5 and t = 2. At what rate (dollars per year) is the price increasing at that time?

2007-11-02 09:57:34 · 1 answers · asked by wildcat11 1

I've been on wikipedia reading about binomial theorem...

http://en.wikipedia.org/wiki/Binomial_theorem

I don't understand the notation they use. What is n and k in those parentheses.

Thanks guys. ;)

2007-11-02 09:44:44 · 3 answers · asked by Axis Flip 3

2007-11-02 09:38:57 · 9 answers · asked by Alexander 6

An oil refinery is located on the north bank of a straight river that is 2 km wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river 4 km east of the refinery. The cost of laying pipe is $200,000 per km over land to a point P on the north bank and $400,000 per km under the river to the tanks. To minimize the cost of the pipeline, how far from the refinery should P be located? (Give your answer correct to two decimal places.)

2007-11-02 09:35:18 · 3 answers · asked by Nikki W 1