^^My interpretation of it is that it's a permutations question. You have 26 letters, but each of the four letter words must contain a vowel. I haven't done permutations for a long time now, but I think the easiest method would be to find the total number of permutations (26P4) minus those with no vowels (21P4). Check the maths, since my skills are very rusty.
Edit: I don't understand how you got the number five, so perhaps I'm misunderstanding the question? ABCD, ABCE, ABCF, ABCG, ABCH, ABCI... etc are all acceptable "words", and that's more than five already.
edited 19th Sep '12 10:57:54 PM by Yuanchosaan
"Doctor Who means never having to say you're kidding." - BocajMath.
Like I know a thing and I know why it's a thing but I don't know how to prove it other than just explaining it.
Like this: In what cases is the Euler phi function odd? It is only odd in one case, and that's n=2. This is because all primes above 2 are odd, and phi(any prime) = prime -1, which is always going to be even. Also whenever you have an odd prime, you're going to divide your number by an odd number into an integer, which is then going to be multiplied by an even number, which is always going to be even. The only thing this isn't going to be true for is like other powers of 2, which is also always going to be even.
Like.
But.
How do I "prove"?
edited 27th Sep '12 11:11:53 PM by ohsointocats
It's basically what those big boards of symbols are all about in Science shows. See here
. You can think of it as a logic/language derived train of thought. If that doesn't help, no idea.
edited 5th Oct '12 11:27:44 PM by Deboss
Fight smart, not fair.Can anyone tell me how the impulse isn't equal to 12 N*s over the 5 second interval?
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EDIT: Problem solved, WebAssign was just being anal about vector notation.
edited 19th Oct '12 8:01:10 AM by hnd03
So. Let's all pause for a moment to smell what the Rock was, is, and forever will be... cooking.—Cave JohnsonMe again.
An 2.4 kg object has a velocity of 7 m/s in the y direction. Then, a constant net force 11.0 N in the x direction acts on the object for 5.50 s.
Calculate the final velocity using the impulse momentum theorem (needs a direction)
I know that the theorem is mass*delta v=force*delta t
But since they're in two different directions, I don't know what to do.
edited 22nd Oct '12 7:44:04 AM by hnd03
So. Let's all pause for a moment to smell what the Rock was, is, and forever will be... cooking.—Cave JohnsonThe velocity in the y direction won't be changed.
So you must calculate the x component of the new velocity, using the information you're given, and then use Pythagoras to find the resultant new velocity.
"We are Libris. We will add your literary distinctiveness to our own. Collection is imminent. Resistance is futile." -Tuefel PM box opeFor a political science class, I need to find an example of a country that transitioned to democracy after the year 1980. seems simple, enough, but I'm having trouble finding any information on this front. Can anyone offer any leads at all?
You can't even write racist abuse in excrement on somebody's car without the politically correct brigade jumping down your throat!Well TV Tropes I have an easy math problem.
Well, it should me easy buy being sick for the past few days.
EDIT: Never mind I figured it out. (thank you Khan Academy)I still need help with this other one though.
How do I factor binomials such as 4x^2-9y^2?
edited 26th Nov '12 12:39:18 PM by Somedude1337
For the first one, when you have a y^2 term like that on the end, that usually means the factors take a form of (ax+by) instead of (ax+b) You already know what the coefficients a and b are, you just need to put the y in.
For the second one, remember the difference of squares
and think a little outside the box. What's the square root of y^2?
Oh right, 4 and 9 are both perfect squares. So this means the answer would (2x+3y)*(2x-3y) right?
EDIT: But what if one of the coefficients isn't a perfect square, say 2m^2-32n^2? Never mind I forgot they both share a common factor. (2)
EDIT 2:electric boogaloo: Okay, now I've found a binomial that isn't the difference of 2 squares.(namely 64am^3-27a) The only factor they share is a, which makes it a(64m^3-27). What do I do from here?
edited 26th Nov '12 2:11:27 PM by Somedude1337

I think I may have found the most poorly-written math problem in the history of math.
How many four letter "words" can you make if no letter is used twice and each word must contain at least one vowel (A, E, I, O, U)?
Okay I know what they mean here is that the letter combination are not real words. However, if each word must contain one vowel, and you can't use letters twice, and there are five vowels, then the highest number of words you can make is 5, and the lowest is 2. If that's not the answer, I have no idea what they're talking about.