NationStates Jolt Archive

I was doing a test today and we had a question :

what is 20 as p√5

I get √2x2x2x2x5x5 which reduces to 4√5x5. Where am I going wrong?

Why wont your teacher give you the answer?

2?5

?20 = ?4 x ?5
=2 x ?5
=2?5

There you go!

[Edit: This post is nonsense. I misread the question.]

I was doing a test today and we had a question :

what is 20 as p√5

I get √2x2x2x2x5x5 which reduces to 4√5x5. Where am I going wrong?
What are you asking? 20 = p√5, find p?

√5 =2.2360679774997896964091736687313
√4 =2

2x 2.23.....!=20 !!!!!!!!!!!!!!!!!!!!!!!!!

What are you asking? 20 = p√5, find p?

yep, hah aren't my communication skills so great... *blushes*

I was doing a test today and we had a question :

what is 20 as p√5

I get √2x2x5x5 which reduces to 2√5x5. Where am I going wrong?

20 = √ 400 = √ (80 x 5) = √ (16 x 5) x √ 5 = 4√5 x √5 (obviously)
Quite a pointless answer though..

What are you asking? 20 = p?5, find p?
If so then: p = 20/?5 = 20?5 / 5 = 4?5

Simple.


~Czardas, Math Whiz of the Universe

yep, hah aren't my communication skills so great... *blushes*
First, practice makes perfect.
Second, don't ever be afraid to ask a question about something YOU don't understand.
Last, don't ever let them see you blush. Unless you've really screwed up, of course.

First, practice makes perfect.
Second, don't ever be afraid to ask a question about something YOU don't understand.
Last, don't ever let them see you blush. Unless you've really screwed up, of course.*blushes*

*realizes that shows he is really screwed up*

*blushes again* :D

~Czardas, Supreme Ruler of the Universe

20 = √ 400 = √ (80 x 5) = √ (16 x 5) x √ 5 = 4√5 x √5 (obviously)
Quite a pointless answer though..

I'll take that one, it looks like mine. And when do you ever get unpointless answers in maths?

If so then: p = 20/?5 = 20?5 / 5 = 4?5

For the life of me, I can't find the flaw in that working, but my calculator says that you're wrong, and I'm right.

Hmm…
[Edit: scratch that, I misread the question. I'm gonna go now...]

you should do what I do and just write "enough" to every question (technically its right but so is recycling)

For the life of me, I can't find the flaw in that working, but my calculator says that you're wrong, and I'm right.

Hmm…
[Edit: scratch that, I misread the question. I'm gonna go now...]Maybe you need to study some math here...


~Czardas, Supreme Ruler of the Universe

Maybe you need to study some math here...

I have a Maths exam tomorrow, actually.

But no, my problem was simply that I thought he wanted ?20 as p?5, rather than 20. So I did that sum.

To be honest, I did questions like that about two years ago now...my mind's a little rusty.

I'll take that one, it looks like mine. And when do you ever get unpointless answers in maths?

When you use it for physics ;) ?

I was doing a test today and we had a question :

what is 20 as p√5

I get √2x2x2x2x5x5 which reduces to 4√5x5. Where am I going wrong?


4

When you use it for physics ;) ?

More often than that certainly.

Gamecube costs $99
Metroid Prime 2 costs $39

Sales tax is 7% ?

Is my $145 enough to buy both?


What length of chainlink fence material do I need to fence off an rectangular area that measures 80m^2?

Originally Posted by Karas
More often than that certainly.

Gamecube costs $99
Metroid Prime 2 costs $39

Sales tax is 7% ?

Is my $145 enough to buy both?


What length of chainlink fence material do I need to fence off an rectangular area that measures 80m^2?

No Your $2.66 short and i would say maybe 120m fence

I have a Maths exam tomorrow, actually.

But no, my problem was simply that I thought he wanted ?20 as p?5, rather than 20. So I did that sum.

To be honest, I did questions like that about two years ago now...my mind's a little rusty.

She!

More often than that certainly.

Gamecube costs $99
Metroid Prime 2 costs $39

Sales tax is 7% ?

Is my $145 enough to buy both?


What length of chainlink fence material do I need to fence off an rectangular area that measures 80m^2?
Better question is "What is the least amount of fence I can buy and fence off 80 m**2?".

9 to the ninth power to the ninth power (not a typo)

Laymans terms:

9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9= ???

9 to the ninth power to the ninth power (not a typo)

Laymans terms:

9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9= ???
Causes the overflow bit in my brain to be set.

Better question is "What is the least amount of fence I can buy and fence off 80 m**2?".

Depends on the shape, best shape would be a perferct circle. Or as the true mathematician would do: put a small piece of fence around yourself and define yourself to be on the outside.

Depends on the shape, best shape would be a perferct circle. Or as the true mathematician would do: put a small piece of fence around yourself and define yourself to be on the outside.
The engineer would use a circle. The math student would optimize a function of area and still get a circle, and you're right, the mathematician would redefine the terms.

I suffered a lot of slings and arrows at the hands of the Georgia Tech math department. Did you ever take a non-finite dimensional vector spaces class? I'm still trying to figure out what I learned in that thing.

9 to the ninth power to the ninth power (not a typo)

Laymans terms:

9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9= ???

Actually you've got that wrong 9 to the ninth power to the ninth power is

(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)
x(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)
x(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)=?

What you had [(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)=?] is 9 to the ninth power squared.

As for what that equals, it's a ridiculously huge number, larger than the number of atoms in a galaxy or something stupid like that.

As for what that equals, it's a ridiculously huge number, larger than the number of atoms in a galaxy or something stupid like that.

Thats the only reason I posted it =D

No wait a minute I got that wrong, it'll start from the highest power therefore it would be

[9 to the power of 9 to the 9]

or

[9 to the power of (9x9x9x9x9x9x9x9x9)]

which is still a stupidly huge number

and I also stuffed up [(9x9x9x9x9x9x9x9x9)x(9x9x9x9x9x9x9x9x9)=?] is not 9 to the ninth power squared it's 9 to the power of 18 which is 9 to the power of (9x2).......sorry I'm very anal.

The engineer would use a circle. The math student would optimize a function of area and still get a circle, and you're right, the mathematician would redefine the terms.

I suffered a lot of slings and arrows at the hands of the Georgia Tech math department. Did you ever take a non-finite dimensional vector spaces class? I'm still trying to figure out what I learned in that thing.

Well, we had lineair algebra, and they didn't limit it to finite dimensions. Common exercises involved functions of x/z acting as vectors, usually with a scalar product defined as <f,p> = int(complex additive(p(x))*f(x)*dx,x=-infinity, infinity)

And now we are using it in quantummechanics.

As for what that equals, it's a ridiculously huge number, larger than the number of atoms in a galaxy or something stupid like that.

Whoa whoa whoa hold on a second, do ya know how small an atom is, and how HUGE a galaxy is. The answer bumber is probably smaller than the ammount of atoms in our solar system, but the whole galaxy thing is a huge exageration, like the answer number.

More often than that certainly.

Gamecube costs $99
Metroid Prime 2 costs $39

Sales tax is 7% ?

Is my $145 enough to buy both?


What length of chainlink fence material do I need to fence off an rectangular area that measures 80m^2?

Is there enough money? It depends if the prices you have quoted are POS prices or not.

And your fence would be anything from 35.78m upwards depending upon the actual dimentions of the field.

9 to the ninth power to the ninth power (not a typo)

Laymans terms:

9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9x9= ???

Properly, it is 9^81.

When you multiply you add exponets. When you bring a number with an exponet up by an exponet you multiply the exponets.

Easy way to prove this is to take the square root of 2^2.

Sqroot (2^2) = (2^2)^(1/2) = 2^[2*(1/2)] = 2^(2/2) = 2^1 = 2


It is 1.966271 * 10^77

Well, we had lineair algebra, and they didn't limit it to finite dimensions. Common exercises involved functions of x/z acting as vectors, usually with a scalar product defined as <f,p> = int(complex additive(p(x))*f(x)*dx,x=-infinity, infinity)

And now we are using it in quantummechanics.
My committee recommended that I take the Hilbert spaces class. What a waste of time. All I did was memorize proofs. I specialized in control theory, degreed in Physics.

Whoa whoa whoa hold on a second, do ya know how small an atom is, and how HUGE a galaxy is. The answer bumber is probably smaller than the ammount of atoms in our solar system, but the whole galaxy thing is a huge exageration, like the answer number.


Yes, but do you realise just how big the number you suggested really is? Lets look at the number of atoms in the solar system

First I'll start off with something everyone knows how many atoms in the earth

(a) Total weight of the earth in pounds = 1.3 x 10e25
(b) Average atomic weight of matter in the earth = 40
(c) Grams in one pound = 453.592
(d) Average number of moles per pound of earth = (c) / (b) = 453.59/40 = 11.34
(e) Avogadro number (number of atoms in one mole of material) = 6.02 x 10e23

Therefore atoms in all the earth = (a) x (d) x (e) = (1.3 x 10e25) x (11.34) x (6.02 x 10E23) = 88.745 x 10E25 x 10e23 = 88.745 x 10E48 = 8.87 x 10e49

Therefore the estimated number of atoms in the Earth is 8.86 x 10E49 lets make that 10 x 10e49 = 1 x 10e50 for simplict sake

So how many earths make up the solar system?

There are eleven planets the biggest (Jupiter) is 318 x the size of earth lets just say all the planets are the size of Jupiter to make things eaiser

Therefore in our therotical solar system we now have 11x318x1x10e5 = 3498x10e50 which is about 3.5x10e53 atoms

Add in the sun which is 333,000 times the mass of Earth = 333,000 x 1 x 10e50 atoms = 3 x 10e55 atoms

Therefore Planet atoms + Sun atoms = 3.5 x 10e53 + 3 x 10e55 = 3.0035 x 10e55 atoms estimated in 1 Solar system (this is very rough and doesn't take into account the huge number of free material which is not the sun or planets but shows a good comparrison between the weight of the sun and the rest of a solar system).

In one galaxy it is estimated there would be 400,000,000,000 stars = 4 x 10e11 stars, since stars make up the majoirty of mass total number of atoms in a galaxy would be something like 4 x 10e11 x 3 x 10e55 = 12 x 10e66 atoms in a galaxy. This is of course a perfect galaxy when all the stars are the same size as our sun.

Damn 12 x 10e66 is a big number that's 12 with 66 zeros following it,

but 9 to the power 9 to the power 9 is 1.966271 * 10e77 (as supplied by Karas, yeah I should have remebered that exponets multiply, choice one dude) which is greater than (my extremmly rough estimate) the number of atoms in a galaxy by a factor of 11 extra zeros.

Therefore 9 to power 9 to power 9 is a still a ridiculously huge number.

Oh yeah my spelling sucks so don't bother pointing out the million spelling errors, but I am intrested in hearing critisim on the actual estimate.

She!

I do apologise!

*hits self*