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

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

Uhh...?

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

No

btw, I meant sets C and D.

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

Yes

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

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

Oh ok

3,6,9

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

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

Sure.

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

O.o wow didnet think about that lol Thanks

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

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

They have a draw thingy

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

{}. Empty set.

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

Ok ty and haha kinda looks like one ;)