Can anyone help me with the answer to the defined sets? The first sign for B = is greater than or equal to 4. The second sign is greater than 5.

B= {xlx≥4}
C= {xlx5}

BU C = _____

B∩ C = ______

Question

Can anyone help me with the answer to the defined sets? The first sign for B = is greater than or equal to 4.  The second sign is greater than 5.

B= {xlx≥4}
C= {xlx>5}

BU C = _____ 

B∩ C = ______

e.mccormick · Answer

The union is items that are in either or both sets.  So if something qualifies as either set, then it is in the union of the sets.

The intersection is ONLY things that are in both.  So if something is not in one of the sets, it can't be in their intersection.

e.mccormick · Answer

$\cup$ means union and $\cap$ means intersection.

anonymous · Answer

If x is greater than and equal to 5 and greater than 4 there is a union at 4

e.mccormick · Answer

Yah, the union is the $\ge 4$ because that covers both.  What about the intersection?

anonymous · Answer

I am just starting to understand this; got it wrong on my homework yesterday, can you tel me what the union and intersections equal?

e.mccormick · Answer

You told me the Union.  You got that right.  So try the intersection based on what I said above.

anonymous · Answer

The intersection is 5

anonymous · Answer

Maybe 4 since that is where they meet

anonymous · Answer

I am thinking 5 again, I told you I don't quite get this yet

e.mccormick · Answer

Well, the intersection is more than just one number.  Lets look at these on a number line.

anonymous · Answer

Since x overlaps at 5 I would say 5

e.mccormick · Answer

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