What do you mean this sentence?
the time a pump takes to drain the pool varies inversely with the power in watts of the pump,
The meaning would be : if we have a power in watts greater the time to drag the pool will be less because the relation between power and time is inverse.  
40 watts--------------5 hours) 
100 watts------------  x
because the relation between power and time is inverse, we multiply directly.
40 watts(5 hours)=100 watts x
x=(200 watts hours) / 100 watts=2 hours.
Answer: the time would be 2 hours.   (the new pump is faster)
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
Answer:
i believe she spent $4.482 on clementines
 
        
             
        
        
        
Answer:
b) x+6
Step-by-step explanation: