Answer:
The Answer is B.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
0.32
Step-by-step explanation:
You can convert -2/5 to -0.4. Then multiply them together to get 0.32. Remember that multiplying two negatives makes a positive. Hope this helps :)
 
        
                    
             
        
        
        
Answer:
B is your answer. 
Step-by-step explanation:
Depends on 18/36 = 72/444, because 444 doesn't make sense at all. None of the others are equivalent. If it's 72/144 then this is the answer 
Hope this helps. 
 
        
             
        
        
        
Answer:
At 0 hours, there are 100 grams of the substance remaining.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
-18
Step-by-step explanation: