Need this quickly........................

Answer:
see explanation
Step-by-step explanation:
A rational number can be expressed in the form
[tex]\frac{a}{b}[/tex] where a and b are integers ( b ≠ 0 )
12= [tex]\frac{12}{1}[/tex] ⇒ rational
- [tex]\sqrt{7}[/tex] → is irrational
- [tex]\frac{4}{3}[/tex] ⇒ rational
6.8 = 6 [tex]\frac{8}{10}[/tex] = [tex]\frac{68}{10}[/tex] ⇒ rational