Answer:
n(AUB)=n(A)+n(B)–n(AnB)
n(AUB)=n⁰(A)+n⁰(B)+n(AnB)
Step-by-step explanation:
This is the formula i have learned. Hope this will help u. U can use them according the question type. 
 
        
             
        
        
        
Answer: $55.35
Step-by-step explanation:
if the bill is $46.15, round it up to $46. Twenty percent of that is $9.20, found by moving the decimal point one place left. Add $9.20 to $46.15, and you get $55.35
i hope this is correct and it helps :)
 
        
             
        
        
        
Answer: In 4 minutes he will make 5 portraits
Step-by-step explanation:

 
        
             
        
        
        
Answer:47/20 or 2.35 in decimal form
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Yes, he will have enough time to watch the entire film. 
Step-by-step explanation:
5:30 to 6:30 is 1 hour of the movie completed. 
6:30 to 7:30 is 2 hours completed.
7:30 plus 30 minutes brings him to 8:00.
8:00 plus the additional 5 minutes brings Greg to 8:05.
His movie ends at 8:05, so he will be able to watch the entire movie before going out.