Which two expressions can be used to answer this question? 45% of the 647 students at royal oak high attended the football game. how many students did not attend? a) 647 - 0.45(647); 0.55(647) b) 647 - 0.45(647); 0.45(647) c) 647 + 0.45(647); 0.45(647) d) 647 - 0.55(647); 0.55(647)