Question

complete the sentence with the correct plural.
notary public
the state government appoints to witness the signing of legally significant documents in order to confirm that the documents are not fraudulent.

Explanation:

To form the plural of "notary public", we follow the rule for compound nouns where the first part (notary) takes the plural form when the noun refers to a person with a title or profession. So "notary" becomes "notaries" and "public" remains as is (since it's part of the title and functions as an adjective - like in "attorney general" plural "attorneys general"). So the plural of "notary public" is "notaries public".

Answer:

notaries public