Let's evaluate each statement given sets $A = \{2, 3, 5, 6, 7, 8\}$ and $B = \{1, 5, 8\}$:

1. $5 \in A$: True.

   • The number 5 is an element of set $A$.

2. $1 \in B$: True.

   • The number 1 is an element of set $B$.

3. $8 \in A \cap B$: True.

   • The number 8 is an element of both sets $A$ and $B$, so it belongs to their intersection $A \cap B$.

4. $3 \in B$: False.

   • The number 3 is not an element of set $B$.

5. $A \subset B$: False.

   • Set $A$ is not a subset of set $B$ because $A$ contains elements (e.g., 2, 3, 6, 7) that are not in $B$.

If you have any questions or need further details, feel free to ask!

Here are five related questions to explore further:

1. What is the union of sets $A$ and $B$?
2. What is the difference $A - B$?
3. If $C = \{2, 3\}$, is $C \subseteq A$?
4. How many elements are in the intersection $A \cap B$?
5. What is the complement of $A$ relative to the universal set $U$ if $U = \{1, 2, 3, 4, 5, 6, 7, 8, 9\}$?

Tip: When determining if one set is a subset of another, ensure every element in the first set is also in the second set.