Science & Mathematics - 14 September 2007

Find the numbers b such that the average value of f(x) = 7 + 6x - 3x^2 on the interval [0, b] is equal to 8.

b = (smaller value)
b = (larger value)

2007-09-14 13:51:25 · 5 answers · asked by Anonymous in Mathematics

Which is dangerous: lightening or thunder?

2007-09-14 13:50:38 · 15 answers · asked by Philip Amiola 1 in Weather

What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation "12x2 - 10x - 42 = 0."

I already did completing the square


Thanks everybody

2007-09-14 13:46:34 · 6 answers · asked by crackr 3 in Mathematics

find the exact value of the following.

a) cos (3pi/4)

b) cot (5 pi/3)

c) tan (13 pi/4)

please help/explain, thanks

2007-09-14 13:45:58 · 2 answers · asked by rickyricardoiscool 1 in Mathematics

The last few posts were really helpful, thanks everyone! BUT two questions still remain:

1) limit as x approaches 0 of: 5x^2Cot^2(4x) (the answer is NOT 0)


2) Limit as x approaches 0 of: 8x^2Sin(9/x) (the answer is NOT 0)


Thanks!

2007-09-14 13:43:49 · 6 answers · asked by Bikki 3 in Mathematics

2007-09-14 13:41:04 · 8 answers · asked by Suze S 1 in Astronomy & Space

2007-09-14 13:41:03 · 6 answers · asked by Suit of Flames 2 in Astronomy & Space

but i was only able to find two x intercepts 2 and 6/5 wen i know that there is suppose to be a third one, because the function hits the x axis 3 times. Can someone varify my answer and tell me wut's wrong.

2007-09-14 13:37:01 · 4 answers · asked by Anonymous in Mathematics

2007-09-14 13:35:59 · 6 answers · asked by cerealmonster101 1 in Medicine

2007-09-14 13:34:58 · 6 answers · asked by cerealmonster101 1 in Medicine

can anyone help please!

Velma jogs 1 lap around the track each day for two weeks. In the third and fourth weeks, she jogs 3 laps each day around the track. During the next two weeks, she runs 6 laps each day. During the fifth and sixth weeks, her goal is to jog 10 laps each day. If this pattern continues, how many laps will she run each day during the seventh and eighth weeks?

2007-09-14 13:33:18 · 10 answers · asked by Jessica 1 in Mathematics

what is happening to the hubble telescope that my dad says it' sbeing brought down, or something like that?


I know it's something... is it being hit by anything soon?

2007-09-14 13:32:38 · 4 answers · asked by Casey 4 in Astronomy & Space

2007-09-14 13:26:09 · 9 answers · asked by Anonymous in Engineering

2007-09-14 13:21:10 · 2 answers · asked by Anonymous in Botany

I should know this but it's been alomst a year since I've done calculus. So how would I go about solving the limits:

1) limit as y approaches 4 of: ((1/y)-(1/4))/(y-4)


2) Limit as x approaches 0 of: 8x^2Sin(9/x)


3) Limit as x approaches 0 of: (1-cos(2x))/5x^2


Thanks!

2007-09-14 13:15:51 · 6 answers · asked by Bikki 3 in Mathematics

If I double major in those two, would most of the courses carry over? What would be a different major that would be good to double in with philosophy? What jobs are there after getting an astronomy degree?

2007-09-14 13:14:09 · 7 answers · asked by freepaidmoney 2 in Astronomy & Space

Im only in 8th grade, so please dont make the answer complicated...thanks!

2007-09-14 13:06:20 · 2 answers · asked by Nicky 3 in Mathematics

2007-09-14 13:04:38 · 5 answers · asked by Anonymous in Botany

12/√5

30/√5

12/√30

13/√40
i answered these already i just wanna kno if i'm right cud u guys help please.
√5/7

15/√12

2007-09-14 13:04:16 · 3 answers · asked by Anonymous in Mathematics

I've heard of something called like a Swartzchild radius, and I think it has something to do with the distace to the event horizon, but I'm not sure. Can someone explain exactly what it is, it's importance, and what we get from it?

2007-09-14 13:03:12 · 4 answers · asked by Anonymous in Astronomy & Space

Is there a way to get water to 100 degrees c and not boil , i think i know , as you can also get water to boil at 40 degrees c , under certain circumstances.

2007-09-14 12:59:30 · 23 answers · asked by 株式会THE CITADEL 株式会 4 in Physics

a) Determine the amount of time t it takes for the rock to hit the bottom of the well.
b) Determine the velocity v of the rock as it is hitting the bottom of the well.
c) If the bottom of the well is lined with thick sand so that the rock does not bounce, what is the velocity vf of the rock just after it hits the bottom of the well?

for (a) I got 2.5 seconds..assuming that the free fall speed is 9.8m/s but it seems that this answer is wrong... I can't figure it out.. can anyone help me?

2007-09-14 12:57:19 · 3 answers · asked by Carlos 1 in Mathematics

Are the shapes diff as a result of the frequencies? to differenciate? and what's the point of having different frequencies? is it a question of "newer" or more industrialized coutnries having lower frequencies or the other way around?

2007-09-14 12:56:57 · 4 answers · asked by Anonymous in Engineering

What is meant by "priming a pump" or "to prime a pump" . THANKS

2007-09-14 12:51:06 · 6 answers · asked by 株式会THE CITADEL 株式会 4 in Engineering

2007-09-14 12:47:11 · 4 answers · asked by Anonymous in Earth Sciences & Geology

i got y= [(x-3)^1/3]/2
but I'm pretty sure i've messed up the order of operations and im not sure if its supposed to switch to x =...

2007-09-14 12:40:40 · 5 answers · asked by Ar J 2 in Mathematics

What is the purpose of the periodic table of elements? Thanks!

2007-09-14 12:37:14 · 4 answers · asked by Anonymous 1 in Chemistry

Which elevator comes to me?

2007-09-14 12:37:07 · 4 answers · asked by jaxattax 2 in Engineering

How come neurons and other cells remain in a differentiated state, when the signals that caused their differentiation are no longer present?

2007-09-14 12:35:12 · 5 answers · asked by Anonymous in Biology

that is what we are saying ....why can we not see thatr globle warming is going to distroy this planet and every one on it.

2007-09-14 12:34:26 · 14 answers · asked by Anonymous in Astronomy & Space