Answer: The allusion reminds the audience that 100 years have passed since the Emancipation Proclamation, yet inequality still exists.
Explanation:
The Emancipation Proclamation by Abraham Lincoln was an Executive Order made in 1863 freeing all slaves in the Confederacy which should have had the effect of giving them equality in society. 
Dr. King is decrying the fact that a hundred years after that Proclamation was made, the people who it was supposed to free were still being viewed through the eyes of racial inferiority and were therefore considered unequal in society. 
 
        
                    
             
        
        
        
Answer:
a. students
Explanation:
Observational units are the entities whose characteristics we measure. Although in some cases, the observational units are the same as the experimental units, this is not always the case. In this case, the entities that are beong observed and examined are students. This is because the survey designed was given to 50 students in an introductory statistics class.
 
        
             
        
        
        
Answer:
Averted sentence examples. She glanced down at his averted face. A shadow crossed her face, before she averted her eyes. He turned at her voice and saw the girl shaking with her eyes averted from the mess.
Explanation:
 
        
             
        
        
        
Answer:puzzled 
Explanation:he was confused because he followed the recipe