Answer:
A, B, C and F
Step-by-step explanation:
We have according to the options:
A. [tex]\sqrt{100} \times \sqrt{100}=10\times 10=20[/tex]
B. [tex]13.5+\sqrt{81} =13.5+9=22.5[/tex]
C. [tex]\sqrt{9}+\sqrt{729}=3+27=30[/tex]
D. [tex]\sqrt{64}+\sqrt{353}=8+\sqrt{353}[/tex], which is not rational.
E. [tex]\frac{1}{3}+\sqrt{216}=0.3+6\sqrt{6}[/tex], which is not rational.
F. [tex]\frac{3}{5}+2.5=0.6+2.5=3.1[/tex]
Hence, the expressions representing rational numbers are A, B, C and F.
