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Answer:
I think the answer is 19
Step-by-step explanation:
 
        
             
        
        
        
First we need to multiply to make the fractions have equal denominators so we can add/subtract.
math: 1/3 x 4/4=4/12
science: 1/4 x 3/3=3/12
Now we can find the time she spent on history (I assume this is what you are looking for)
Total time-math time<span>-science time=history time</span>
12/12-4/12-3/12
=5/12
Amy spent 5/12 of her time working on history.
        
                    
             
        
        
        
The cost of the bond
6×1,000×0.92=5,520
        
                    
             
        
        
        
Answer: The answer is 11 1/24 or in decimal form 11.04
Step-by-step explanation: