Question

D = {x|x is a whole number} E = {x|x is a perfect square between 1 and 9} F = {x|x is an even number greater than or equal to 2 and less than 9} D∩F is {4, 6}.

Answer 1

the answer is 4

Answer 2

Vanessa Morgan? xD

Answer 3

4 is a whole number, so 4∈D.
4 is a perfect square between 1 and 9, so 4∈E
4 is an even number greater than or equal to 2 and less than 9, so 4∈F.

4∈E ∧ 4∈F ⇒ 4∈(E∩F).

4∈D ∧ 4∈(E∩F) ⇒ 4∈D∩(E∩F).