Science & Mathematics - 14 September 2007

please help me with my homework. i don't understand...

2007-09-14 15:00:43 · 4 answers · asked by Ally C 1 in Biology

f(x) = (x+2)(2x-3). F(-2) =
choose from the following answers
a. 0
b. 6
c. -6
d. -14

2007-09-14 15:00:00 · 3 answers · asked by Trinity 1 in Mathematics

Find the angle (in degrees) between the plane x+6y+z=3 and the line with symmetric equations (1/6)x+(1/2) = y-1 = z-1.

2007-09-14 14:59:12 · 3 answers · asked by Anonymous in Mathematics

The mass of the Earth and the Sun are obviously changing continuously as the Sun gives off energy and we burn natural resourses from within the Earth that cannot be regenerated or replaced. It takes calculations carried out to an extreem degree to put the shuttle in orbit for just a couple weeks. If the Earth is being acted upon by external forces (asteroid impacts and the like), shouldn't the Earth have moved out of its orbit a couple million years ago?

2007-09-14 14:59:07 · 6 answers · asked by Anonymous in Astronomy & Space

Donna invested her $33,000 bonus and received $970 in interest after one year. If part of the money returned 4% and the rest earned 2.25%, how much did she invest at each rate?

2007-09-14 14:58:21 · 3 answers · asked by Mariana C 1 in Mathematics

A line passes through A = (1, 4, 1) and is perpendicular to the plane 5x+5y+2z=2.
Find the point P of intersection of the line and the plane.
Thanks for the help!

2007-09-14 14:53:36 · 0 answers · asked by drsayre2002 3 in Mathematics

Give me your opinions.

2007-09-14 14:51:02 · 10 answers · asked by Anonymous in Astronomy & Space

In a science project, my partner and I want to place first and do the best we can. We like complicated projects, but the materials must not be too expensive!, and we are very good in math and science and willing to take any challenge.
To place first, we need a very very cool, complicated, but understandable project. What do you think should be a suggestion?

NOTE: whoever puts the project that we like and/or qualifies on all the requirements get TEN points and two thank yous! :]


P.S. We are 8th graders but provide us with a project with challenge. Thanks.

Additional Details

3 days ago
the project for collecting the data can take up to as much as one month. math, science as said in the question are our faves. any science is okay as long as it`s fulfills the requirements. thanks


& our teacher told us we can get help from others like the procedures, materials, but the explanation is pretty much on our own. thank you.

my email: lilbluee_hotgreen@sbcglobal.ne...

2007-09-14 14:48:56 · 5 answers · asked by MaggieSin 3 in Other - Science

2007-09-14 14:48:47 · 3 answers · asked by fm 1 in Mathematics

i don't really understand what teachers say happened?

2007-09-14 14:44:38 · 10 answers · asked by Hello 3 in Other - Science

They are billed a fixed amount yearly plus a charge for each cubic foot of water used. A household using 1000 cubic feet was billed $90, while one using 1600 cubic feet was billed $105.

A. What is the charge per cubic foot?
B. Write an equation for the total cost of a resident's water as a function of cubic feet of water used.
C. How many cubic feet of water used would lead to a bill of $130?

2007-09-14 14:41:47 · 2 answers · asked by Anonymous in Mathematics

A mint has three machines capable of making coins. All three machines together can make 246 coins per minute. Machine A is twice as fast as machine B. Machine C can make 30 more coins per minute than machine B. How many coins per minute can machine B make?

2007-09-14 14:40:19 · 4 answers · asked by Anonymous in Mathematics

A speed ramp at an airport is basically a large conveyor belt on which you can stand and be moved along. The belt of one speed ramp moves at a constant speed such that the person who stands still on it leaves the ramp 64 seconds after getting on. Clifford is on a real hurry, however, and skips the speed ramp. Starting from rest with an acceleration of 0.37 m/s^2, he covers the same distance as the ramp does, but does in one-fourth of the time. What is the speed at which the belt of the ramp is moving?

You may need the following equations:
v=v0+at
x=x0+v0t+1/2a(t^2)
v^2=v0^2+2ax

2007-09-14 14:37:40 · 1 answers · asked by Anonymous in Physics

A quarterback claims that he can throw the football a horizontal distance of 176 m. Furthermore, he claims that he can do this by launching the ball at the relatively low angle of 25.4 ° above the horizontal. To evaluate this claim, determine the speed with which this quarterback must throw the ball. Assume that the ball is launched and caught at the same vertical level and that air resistance can be ignored. For comparison a baseball pitcher who can accurately throw a fastball at 45 m/s (100 mph) would be considered exceptional.

2007-09-14 14:36:04 · 4 answers · asked by lonelygirlinhell 1 in Physics

put it in order out of alaska, hawaii, california flordia

2007-09-14 14:33:00 · 2 answers · asked by Anonymous in Geography

5sqrt(2-5y) dy

Thats the fifth root of 2-5y.

I got 1-(x^4)^(9)

but its wrong.

2007-09-14 14:28:22 · 4 answers · asked by Anonymous in Mathematics

A train moves at a constant speed of 60 km/h toward a station 30 km away. At that moment Fanny Fastbird leaves her perch on the locomotive and flies toward the station at a constant speed of 100 km/h relative to the ground. When the bird reaches the station, she immediately turns around and flies back to the train at the same speed. When reaching the train she again immediately turns around and flies back to the station, repeating the process until the train passes the station. What total distance is traveled by the bird?


Thank you so much for your help! I am curious as to how I would solve this problem, and the more steps shown, the better. Thank you!

2007-09-14 14:24:00 · 3 answers · asked by Anonymous in Physics

2007-09-14 14:22:36 · 5 answers · asked by DROCK 1 in Physics

Find the Domain and Range of

f(t) = sec(pi*t/4)

Please explain, i'm trying to grasp it.
I know I can find the range and domain by graphing it with my Ti - 89, but how do i figure it out algebralicly.

Thanks


Heres what the solution manual shows as the answer, could you explain what he is doing there? Im lost.
Thanks

http://img207.imageshack.us/my.php?image=mathprob2uf9.jpg

2007-09-14 14:19:24 · 3 answers · asked by Matthew K 2 in Mathematics

I'm kinda new to the whole Yahoo Ask thing, but I'd gladly appreciate anyone who can help me with this question. And if at all possible, I would like to know how get started with it please.

Oh and H2SO4 is sulfuric acid

2007-09-14 14:16:23 · 2 answers · asked by j0shua0h 1 in Chemistry

hello everybody

in class i did an experiment and i lunched a metal cart down a ramp and recorded the data from the ticker timer and than i plotted a position- time graph.

http://img466.imageshack.us/my.php?image=positionvstimemt0.jpg

one of the questions asks what type of motion was the cart undergoing? and how can you tell by the shape of the graph?

what would you guys/girls the answer is for the above questions?(i included a photo of the graph above)

thanks alot!:)

2007-09-14 14:13:40 · 2 answers · asked by Anonymous in Physics

across the membrane?

2007-09-14 14:12:20 · 3 answers · asked by Terri L 2 in Biology

I need to know who invented the pump and its uses. any sources you could give me would be more than awesome.

2007-09-14 14:10:55 · 3 answers · asked by arquerozdm 2 in Engineering

2007-09-14 14:05:34 · 8 answers · asked by Anonymous in Medicine

i sure would, but i'd tell'em no anal probes or other painful experiments lol.

2007-09-14 14:01:22 · 8 answers · asked by Anonymous in Astronomy & Space

Because we do not even know if one is coming [ they have longer periods and travel in and out of the Oort cloud ], and may have as little as 1 month to discover and react.

Do we have any chance of being hit by commet?

2007-09-14 14:00:26 · 8 answers · asked by Anonymous in Astronomy & Space

I did it by dividing 800 by 75 and I got 10.66
The computer says this answer is wrong.
What is the correct answer?

Thank you very much and I will be choosing a best answer tomorrow

2007-09-14 13:59:20 · 14 answers · asked by Anonymous in Mathematics

2007-09-14 13:57:32 · 3 answers · asked by Anonymous in Mathematics

2007-09-14 13:55:41 · 9 answers · asked by Kena 1 in Zoology

Are fortune cookies true? Are the fortunes really real?

2007-09-14 13:53:32 · 19 answers · asked by Anonymous in Zoology