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. In the sentence provided, "tipped his hat politely" is the complete predicate because it includes the verb ("tipped"), which indicates an action carried out by the subject, and the words that modify it: a direct object ("his hat") and an adverbial of manner ("politely").
