The sets A and B are defined as follows.?

Question

F= {wIw ≤3}
H= {wlw >9}

 

 

Write A U B and A ∩ B using interval notation.
If the set is empty, write ∅

Answer 1

I assume you mean F U H and F ∩ H:

• F U H is the union or combination of the two sets:  F U H = (-∞,3]U(9,∞)
• F ∩ H is the region where sets F and H intersect or overlap.  Since they don't overlap at all F ∩ H = ∅