Step-by-step explanation:

 
        
                    
             
        
        
        
Answer: The proportion of oil tankers that had spills is  or 0.329.
 or 0.329.
Step-by-step explanation:
Since we have given that 
Number of tankers is drawn = 474
Number of tankers did not have spills = 318
Number of tankers have spills = 474 - 318 = 156
Proportion of oil tankers that had spills is given by

Hence, the proportion of oil tankers that had spills is  or 0.329.
 or 0.329.
 
        
             
        
        
        
Answer:
a=1.29 approx
Step-by-step explanation:
 
        
             
        
        
        
Answer:
answer is B 38-18
Step-by-step explanation:
38 + (-18) 
38-18