Answer:
7/80
Step-by-step explanation:
Given that: P(B) = 7 / 20, P(A|B)= 1 / 4
Bayes theorem is used to mathematically represent the conditional probability of an event A given B. According to Bayes theorem:

Where P(B) is the probability of event B occurring, P(A ∩ B) is the probability of event A and event B occurring and P(A|B) is the probability of event A occurring given event B.

 
        
             
        
        
        
Answer:
1. 8/$12=21/$x then cross multiply. 
2. 1/$1.5, we're looking for cost so $1 is more reasonable 
3. $31.5
Step-by-step explanation:
12x 21/ 8 = 31.5 
 
        
                    
             
        
        
        
Answer:
240
Step-by-step explanation:
V=width height  length  = 10 · 3 · 8 = 240
Hope this helped, have a wonderful day man!