CREATE TABLE table_name_49 (location_attendance VARCHAR(255), high_rebounds VARCHAR(255), high_points VARCHAR(255))
What is the location attendance of the game with A. Horford (10) as the highest rebounds and J. Johnson (21) as the highest points?
    
SQL: SELECT location_attendance FROM table_name_49 WHERE high_rebounds = "a. horford (10)" AND high_points = "j. johnson (21)"