## College Algebra 7th Edition

(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.