Answer:
-28
Step-by-step explanation:
52-24= 28
so the opposite 
24-58= -28
 
        
             
        
        
        
Answer:
I get 92 but not really sire
 
        
             
        
        
        
Answer:
1 dollar every 1/39 hour
Step-by-step explanation:
If Christopher earns $78 in two hours, he must earn $39 dollars in one hour because 78/2 is 39. Therefore, every hour Christopher earns $39. To find the amount of hours per dollar, divide 1, the hour, by 39, the money per hour, to get 1/39.