Answer:
 -2.1 = -21/10
 -2.3 = -23/10
 -2.5 = -5/2
Explanation:
Any decimal number of finite length is a rational number. Choose three between -2 and -3. Here, we have chosen -2.1, -2.3, -2.5. Expressed as improper fractions, they are, respectively, ...
 -21/10
 -23/10
 -5/2