CREATE TABLE table_21518 ("Game" FLOAT, "Date" TEXT, "Team" TEXT, "Score" TEXT, "High points" TEXT, "High rebounds" TEXT, "High assists" TEXT, "Location Attendance" TEXT, "Record" TEXT)

How many scores are listed for the game against Houston
SELECT COUNT("Score") FROM table_21518 WHERE "Team" = 'Houston'
SELECT COUNT("Score") FROM "table_21518" WHERE "Team" = 'Houston'