Answer:    
Step-by-step explanation:
Let A = he known the answer then A' = he guess the answer.
B = he answered it correctly
As per given , we have



By Bayes theorem , we have

The probability that the student knows the answer given that he answered it correctly is   .
 .
 
        
             
        
        
        
Answer:
840
Step-by-step explanation:
if it can hold 70 in 20 minutes it can hold 210 in 1 hour and 4x210 equals 840
 
        
             
        
        
        
Search up the formula on safaris it really easy jk it’s c2/ 4 pi
        
             
        
        
        
Answer:
i need this answer too
Step-by-step explanation:
lol