#### Answer

Rational: $-1, -0.5, 0, 3, \sqrt{25}=5,7.5,\displaystyle \frac{24}{2}=12$

#### Work Step by Step

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