Answer
(a) rational, integer, natural number
(b) irrational
(c) rational, integer
(d) rational, integer
Work Step by Step
(a) $5=5/1$, so it is rational. It is also an integer and a natural number.
(b) $\sqrt{5}$ is irrational, since it does not reduce to a whole number or a ratio of whole numbers.
(c) - $\displaystyle \frac{9}{3}=-3$ is rational. It is also an integer.
(d) $-1000000$ is rational. It is also an integer.
