The set $A = \{ x : x \in \mathbb{R}, x^2 = 16 \text{ and } 2x = 6 \}$ is equal to

State whether the following set is finite or infinite:
The set of numbers which are multiples of $5$.

List all the subsets of the set $\{-1, 0, 1\}$.

Determine whether the following set is finite or infinite:
$\{1, 2, 3, \ldots, 99, 100\}$

Examine whether the following statement is true or false:
$\{a, e\} \subset \{x : x \text{ is a vowel in the English alphabet}\}$

State which of the following sets are finite or infinite: $\{ x:x \in N \text{ and } 2x - 1 = 0 \}$