Final answer:
The option '6m' is not a mathematical sentence.
Step-by-step explanation:
A mathematical sentence is a statement that uses numbers and symbols to show a relationship between two or more quantities. It must be true or false. In the given options, the statement
is not a complete mathematical sentence because it lacks any symbols or operators to indicate a relationship between quantities. It is just a product of 6 and m and does not make any comparison or statement about quantities.
Learn more about mathematical sentences