Intermediate Algebra (12th Edition)

Rational: $-1, -0.5, 0, 3, \sqrt{25}=5,7.5,\displaystyle \frac{24}{2}=12$
Rational numbers can be expressed as a ratio of two integers. Thus the following numbers are rational: $-1=\frac{-1}{1}$ $-0.5=\frac{-1}{2}$ $0=\frac{0}{1}$ $3=\frac{3}{1}$ $\sqrt{25}=\frac{5}{1}$ $7.5=\frac{15}{2}$ $\displaystyle \frac{24}{2}$