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