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Old 01-25-2009, 03:33 PM   #1
ravenguy2000
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Arrow I need math help

Set C consists of all of the positive integer multiples of 5 that are less than 20. Set D consists of all of the factors of 20. Which of the following is C |_| D?

(Where that |_| is like a wide lower case "u," a symbol I've never encountered before).

{1,2,4,5,10,15,20}
{2,4,5,10,15}
{5,10}
{5,10,15,20}
{2,4,5,10}

 
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Old 01-25-2009, 03:36 PM   #2
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The U means union, so it's the all of the numbers from C combined with all of the numbers in D.

So the answer is {1,2,4,5,10,15,20}

 
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Old 01-25-2009, 03:38 PM   #3
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Thanks. I'll probably have more in a little bit.

 
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Old 01-25-2009, 03:39 PM   #4
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http://en.wikipedia.org/wiki/Union_(set_theory)

 
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Old 01-25-2009, 03:50 PM   #5
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Ok maybe I'm not understanding something here and this is really obvious, but

If 299 is divisible by 2B, and B represents a positive digit, what is the value of B?

2
3
4
6
9

 
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Old 01-25-2009, 04:03 PM   #6
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I really hope it's that I haven't finished this coffee that's making that confusing to me.

 
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Old 01-25-2009, 04:06 PM   #7
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Assuming 2B means twenty-B and not 2xB, it has to be 3 or 9 because an odd number can't have an even factor. 299/23 is 13, so B is 3.

 
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Old 01-25-2009, 04:08 PM   #8
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oohh bad notation ftw

 
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Old 01-25-2009, 04:08 PM   #9
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I'm with you except since when does 2B mean twenty-B

 
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Old 01-25-2009, 04:09 PM   #10
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aha, i was pretty confused by that problem before as well. good thinking, andyslash

 
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Old 01-25-2009, 04:09 PM   #11
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Quote:
Originally Posted by ravenguy2000 View Post
I'm with you except since when does 2B mean twenty-B
when the question writer sucks

 
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Old 01-25-2009, 04:09 PM   #12
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Quote:
Originally Posted by ravenguy2000 View Post
I'm with you except since when does 2B mean twenty-B
in a sane world, never

 
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Old 01-25-2009, 04:11 PM   #13
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Oh ok. I don't feel so bad now.

 
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Old 01-25-2009, 06:23 PM   #14
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sue them!

2B for god's sake jesus fucking christ how on earth could that mean twenty-something?!? REVOLUTION!!!

 
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Old 01-25-2009, 06:26 PM   #15
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Old 01-25-2009, 11:50 PM   #16
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Default i need meth help

.

 
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Old 01-26-2009, 12:04 AM   #17
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Quote:
Originally Posted by Cool As Ice Cream View Post
sue them!

2B for god's sake jesus fucking christ how on earth could that mean twenty-something?!? REVOLUTION!!!
its a dumb and awkward way of asking a dumb question. why couldnt the options have been
23
24
26
29

 
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Old 01-27-2009, 07:43 PM   #18
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If the domain of f is given by x={9,0,-9}, what is the range of the function f(x)=x2+9x

This is probably pretty easy but I don't really remember the gist of the domain/function thing.

 
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Old 01-27-2009, 07:45 PM   #19
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Oh wait does it just mean I should plug in 9,0,-9 into the function, hence {0,162} ?

 
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Old 01-27-2009, 07:47 PM   #20
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i feel like this knowledge was rolling around in my brain at some point.


 
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Old 01-27-2009, 07:49 PM   #21
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Quote:
Originally Posted by ravenguy2000 View Post
Oh wait does it just mean I should plug in 9,0,-9 into the function, hence {0,162} ?
Yeah, the range would be all possible f(x) values

 
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Old 01-27-2009, 08:46 PM   #22
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if 2(the cube root of x) = 3

then x =

why is this not completely obvious

 
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Old 01-27-2009, 10:44 PM   #23
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it sounds like you're trying to do the problems without having seen the theory...
or is this unrelated to a math class?

 
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Old 01-27-2009, 10:53 PM   #24
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I've seen the theory, it was just 8 years ago.

And yeah, I'm not taking a class.

 
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Old 01-27-2009, 10:54 PM   #25
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Quote:
Originally Posted by ravenguy2000 View Post
if 2(the cube root of x) = 3

then x =

why is this not completely obvious
divide both sides by 2, then cube both sides
x=27/8

 
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Old 01-27-2009, 11:21 PM   #26
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Durr. Thanks. Over thinking there a bit. 6th grade ravenguy would pwn 25 year old ravenguy.

 
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Old 01-27-2009, 11:30 PM   #27
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ravenguy i think my favorite moment of 3rd rock from the sun occurs at 3:55-4:10 of this video YouTube - 3rd RFTS S01 E04- Dick is From Mars, Sally is From Venus (1/3)

 
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