Answer:
 B 
Step-by-step explanation:
 I'm not sure if it's right but you can try it 
 
        
                    
             
        
        
        
Answer:
C!!!!!!!!!!!!!!!!!!!!!
Step-by-step explanation:
Have a good day UvU
 
        
                    
             
        
        
        
Answer:
t ≥ 96   test score must be 96 or greater
Step-by-step explanation:
Let t - score on his third test
    (75 + 81 + t) ÷ 3 ≥ 84
⇒ (75 + 81 + t) ≥ 84 x 3
⇒ (75 + 81 + t) ≥ 252
⇒ 156 + t ≥ 252
⇒ t ≥ 252 - 156 ≥ 96
 
        
             
        
        
        
Answer:
Random sample
Step-by-step explanation:
It's a random sample because she did not pick the students 1 by 1, she just chose random students from a list