Science & Mathematics - 18 November 2007

I do an online program and i am a senior in high school. With this program I have no teacher and I get no practice. I am doing functions but have no clue how to do some. How do you do these?
1. f(x) = x2 + 7x
Find f(-3)

2. f(x) = -3x + 9
g(x) = 8x + 7
Find f(x) + g(x)

3. f(x) = -3x + 9
g(x) = 8x + 7
Find f(g(x))

4. f(x) = 4xSquared
h(x) = -7x - 5
Find h(f(3))

5. h(x) = 2x3 - 5x2
Find h(3)

6. h(x) = 2x3 - 5x2
Find h(-5)

7.f(x) = 15 - 6x
g(x) = 3 x
5
Find g(f(x))

8. f(x) = x3 - x2 - 3x + 5
Find f(4)

THANK YOU FOR ANY HELP THAT YOU CAN GIVE ME. I GREATLY APPRECIATE IT.

2007-11-18 16:17:10 · 6 answers · asked by Anonymous in Mathematics

2007-11-18 16:15:22 · 5 answers · asked by ajharrisq8 1 in Zoology

what do you think ?

2007-11-18 16:12:39 · 4 answers · asked by Anonymous in Engineering

?

2007-11-18 16:07:27 · 3 answers · asked by Anonymous in Mathematics

Please give me reasons why it will not.

2007-11-18 16:05:40 · 11 answers · asked by Anonymous in Astronomy & Space

2007-11-18 16:00:23 · 10 answers · asked by Anonymous in Parapsychology

Maybe an algae or bacteria?

I appreciate your help!

THX

2007-11-18 15:56:36 · 1 answers · asked by Anonymous in Biology

the documentary loose change made too much sense on too many levels to just let slide. Yet i cant help wonder if some of the things they said were made up. they seemed like they were hunting for a conspiracy before they found one. which is an easy way to get bad info. so what im looking for is a list of true or false answers not tainted with politics.
1. what is the structurally unstable point of steel due to heat?
2. what is the maximum heat attainable by jet fuel under perfect conditions?
3. How many planes have ever vaporized on impact leave next to no wreckage?
4. How many sky scrapers framed with steel have collapsed due to fire?
5. Could cell phones work on planes on 9/11? were they technoligically capable of doing so?
6. when buildings collapse do they fall straight down on thier own (similair to a planned demolision), is that impossible?
- for your answers do not use anything from 9/11 as an example. I want evidence from other places. I dont care which side it supports

2007-11-18 15:52:16 · 2 answers · asked by Themythdorkage 1 in Engineering

2007-11-18 15:44:12 · 6 answers · asked by stay.twilight 3 in Chemistry

2007-11-18 15:42:57 · 3 answers · asked by stay.twilight 3 in Chemistry

29. Of a set of four quantum numbers, how many of these numbers can be shared by more than one electron of the same atom?

2007-11-18 15:38:51 · 3 answers · asked by rebeccapolsh333 2 in Chemistry

I'm just wondering if you guys have heard of the otherkin species? if you don't know or think we're "stupid" for studying then keep off I don't care if you don't believe but please no disrespect it's getting old
if you don't know what "otherkin" are
they are "humans" who have the soul and some features of other beings
ie some are angelics, demonics, dracon, dragons, ware animals, vampires and so on
if you know anyone who is or are yourself go on and pm or Im me I have several nonhuman friends and really enjoy studying it

2007-11-18 15:33:51 · 17 answers · asked by Anonymous in Paranormal Phenomena

2007-11-18 15:32:50 · 4 answers · asked by Anonymous in Medicine

2007-11-18 15:30:52 · 4 answers · asked by jared c 1 in Biology

the equation is y = 3/4x + 5/2

2007-11-18 15:25:47 · 11 answers · asked by Donovan Rose 1 in Mathematics

Hint: Consider the wheel's energy. Consider a wheel of radius 1:15 m, mass 8:7 kg and moment of inertia I = (MR^2)/2 (it's a solid disk). The wheel rolls without slipping in a straight line in an uphill direction 17 degree above the horizontal. The wheel
starts at angular speed 18:3 rad/s but the rotation slows down as the wheel rolls uphill, and eventually the wheel comes to a stop and rolls back downhill. The acceleration of gravity is 9:8 m/s^2. How far does the wheel roll in the uphill direction before it stops? Answer in units of m

2007-11-18 15:21:46 · 3 answers · asked by Captain Jack is Back 1 in Physics

An infinite rod with initial temperatures f(x) = A when x>0 and f(x) = B when x<0. Find the temp u(x, t) for time t>0 expressed in terms of the error function

2007-11-18 15:20:56 · 1 answers · asked by Anonymous in Mathematics

What are the obstacles that surround the possibility of cars running on Atomic Batteries?

2007-11-18 15:20:22 · 2 answers · asked by Anonymous in Engineering

2007-11-18 15:19:06 · 2 answers · asked by Macgyver with Crosby 4 in Earth Sciences & Geology

Someone can help me ! Thank you very much !

2007-11-18 15:17:26 · 3 answers · asked by young.aviator 1 in Engineering

2007-11-18 15:15:04 · 3 answers · asked by kate 2 in Weather

2007-11-18 15:14:38 · 2 answers · asked by Selena T 1 in Mathematics

I need help with this question:

Discuss/Describe the advantages and disadvantages of the life history patterens of both insects (mosquitoes) and mammals (humans, elephants).

I wasnt at school when the teacher went over this, because my grandma passed away, and we have a test over it tommorrow,

all answers will be greatly appreciated
:]

2007-11-18 15:09:41 · 3 answers · asked by Anonymous in Biology

2007-11-18 15:04:01 · 6 answers · asked by vsmooth8 1 in Mathematics

2007-11-18 15:03:42 · 3 answers · asked by Anonymous in Mathematics

medical doctors use radioactive materials in many ways. do research and make a list of at least five uses for radiation in medicine.

This is the question it couldnt fit

2007-11-18 15:01:32 · 4 answers · asked by Drew C 1 in Medicine

a 6.35 L sample of carbon monoxide is collectedf at 55 C and 0.892 atm. What volume will the gas occupy at 1.05 atm and 59 C?
1. 6.10 L
2. 1.96 L
3. 5.46 L
4. 6.68 L
5. 4.82 L

2007-11-18 14:58:11 · 1 answers · asked by Raisa S 1 in Chemistry

i have to do a project for school and i have to make up a cool fact using the mole. and to refresh your memory, the mole refers to 6.02 x 10^23 of anything (Avogadro's number).

So heres the problem...
if i wanted to take a mole amount of pictures (6.02x10^23 pictures), and it takes me 5 seconds to take a picture, how long would it take me to take a mole amount of pictures?

show work please.... :)
and if you know how to do it the dimensional analysis way, please tell me how to do it that.
thanks :)

2007-11-18 14:58:10 · 1 answers · asked by sara 3 in Chemistry

Okay, I've been doing a review sheet for my pre-calc final and I've been able to do most of these problems okay. (Albeit it takes me awhile sometimes, lots of trial and error.)

However out of all of them these five gave me the most trouble, in the section of verifying trigonomic identities, if anyone knows how to work these out in steps I'd be greatly appreciative to know.

Anyhow here they are:

1.) sec^4 - tan^4x = sec^2x = tan^2x
2.) cos θ (sec θ - cos θ) = sin^2 θ
3.)
(sinx + cosx)^2 / sin^2x-cos^2x = sin^2x - cos^2 / (sin x - cos x)^2
(I think I'm doing this one correctly but I am still curious about it.)

4.)
(cotx - cscx)^2 = 1-cosx / 1+cosx

5.) (3cos θ - 4 sin θ)^2 + (4cos θ + 3 sin θ)^2 = 25

Any help would be great!

2007-11-18 14:56:12 · 3 answers · asked by Disasterpiece 1 in Mathematics

experss this speed in meters per second?
what is this speed in miles per hour
what is this speed in light year per year

can you please show the solutions thanks

2007-11-18 14:54:21 · 2 answers · asked by Anonymous in Physics