If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and D = {numbers divisible by 3 from 1 to 21}, what is C ∩ D?
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21}
{3, 6, 9, 12, 15, 18, 21}
{3, 6, 9}
{ }

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- anonymous

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- anonymous

I think it would help if you listed the numbers in set D

- anonymous

Basically, D={3,6,9,12,15,18,21}
You need to find numbers that are in set A AND set D to get C ∩ D

- anonymous

Uhh...?

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## More answers

- anonymous

Do you understand the part about getting the numbers in set D?

- anonymous

No

- anonymous

btw, I meant sets C and D.

- anonymous

Numbers divisible by 3 from 1-21? 3 is divisible by 3 because it equals a whole number(1). 6/3=2 (Also a whole number). 9/3=3... etc. Better?

- anonymous

Yah i understand how to do that but i dont understand how to get the answer :/ Could u walk me throug it

- anonymous

Sure. Do we agree that D={3,6,9,12,15,18,21}?

- anonymous

Yes

- anonymous

∩ means intersection which also means that the numbers in that set MUST be in the 2 sets surrounding it.

- anonymous

It basically means that the numbers in the intersection of the sets must be in BOTH sets.

- anonymous

So if A={2,4,6,7} and B={3,4,5,6}, A∩B would be {4,6} because 4 and 6 are in both sets A and B

- anonymous

Oh ok

- anonymous

Now that you have both sets, match 'em up and see which numbers are in both.
C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
D={3,6,9,12,15,18,21}

- anonymous

3,6,9

- anonymous

Ohh Ty ^^ Can u help me with another on? please?

- anonymous

Right. Which means that your answer should look like:
A∩B={3,6,9}

- anonymous

Sure.

- anonymous

If A = {vowels in the English alphabet} and B = {consonants in the English alphabet}, what is A B?
{all letters in the English alphabet}
{a, e, i, o, u}
{b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, y, z}
{ }

- anonymous

List both sets A and B, please. Also, I don't know what the relation between A and B is because you don't have anything in between A and B

- anonymous

there is supossed to be a " U" smble between the A and b on the last sentence and it stated A and B

- anonymous

That's easy, then.The answer is just all the letters of the alphabet. Consonants+vowels=letters of the alphabet.

- anonymous

O.o wow didnet think about that lol Thanks

- anonymous

Ill be posting a few more u acn help if u want

- anonymous

This would be a lot easier if OpenStudy made a Apple Application so I could write everything out...

- anonymous

They have a draw thingy

- anonymous

doesn't help. Have you tried it? My drawings always look atrocious.

- anonymous

lol ssame do u kno how to to dthis?
If A = {0, 1, 2, 3} and B = {…−3, −2, −1}, what is A ∩ B?
{…−3, −2, −1, 0, 1, 2, 3, …}
{…−3, −2, −1}
{0, 1, 2, 3}
{ }

- anonymous

{}. Empty set.

- anonymous

It can also be |dw:1347317896078:dw|
Not a circle, btw

- anonymous

Ok ty and haha kinda looks like one ;)

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