Please don't write "the following" if you don't provide a list.
The question asks about the "following". In such circumstances would it be too much to expect that you make sure that there is something that is following?
None of the "following" expressions!
Whats n+8
The GCF is 13xy.
a rational function.
2(p+11)
None of "these" expressions represent anything!
An equal sign (=) with a slash through (/) represents that two expressions are disproportional.
a + 10
None of the "following" expressions!
Yes. Rational functions must contain rational expressions in order to be rational.
An infinity of expressions equal 49.
The GCF is 12.
Because f represents a function.
Whats n+8
The GCF is 13xy.
a rational function.
An absolute-value function