How many Yelp_Business in Arizona has user no. 3 reviewed?
in Arizona refers to state = 'AZ'; user no. 3 refers to user_id = 3
SELECT COUNT(T2.business_id) FROM Reviews AS T1 INNER JOIN Business AS T2 ON T1.business_id = T2.business_id WHERE T2.state LIKE 'AZ' AND T1.user_id = 3