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

If $A = \{1, 2, 3, \ldots, 10\}$,then the number of non-empty subsets of $A$ containing only odd numbers is

If $A = \{x \in R : x^2 - 5|x| + 6 = 0\}$,then find $n(A)$.

If $R$ is the set of real numbers and $Q$ is the set of rational numbers,then what is $R - Q$?

Make correct statements by filling in the symbols $\subset$ or $\not\subset$ in the blank spaces:
${ x:x \text{ is an equilateral triangle in a plane} } \dots { x:x \text{ is a triangle in the same plane} }$

Write down all the subsets of the following set: $\{a\}$