Answer: The complete predicate is "tipped his hat politely".
Explanation: The complete predicate of a sentence is the verb or verb phrase, which generally refers to an action or a state, and the words that accompany it and provide additional information about it. <u>In the sentence provided, "tipped his hat politely" is the complete predicate because it includes the verb </u>("tipped"), which indicates an action carried out by the subject, <u>and the words that modify it</u>: a direct object ("his hat") and an adverbial of manner ("politely").