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

Which of the following sets is finite or infinite?
The set of prime numbers less than $99$.

Given the sets $A = \{1, 3, 5\}$,$B = \{2, 4, 6\}$,and $C = \{0, 2, 4, 6, 8\}$,which of the following sets can be considered as a universal set for all three sets $A$,$B$,and $C$?

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

State whether the following set is finite or infinite:
The set of circles passing through the origin $(0,0)$.

Determine the subset for the set $\{n(n+1)(2n+1) : n \in \mathbb{Z}\}$.