D^2 - 4d = 3d
d^2 - 7d = 0
d(d - 7) = 0
d = 0   or   d - 7 = 0
d = 0   or   d = 7
        
             
        
        
        
I think you would have to multiply $4.92 and 6... if so the answer would be $29.52 for the unit price.
        
             
        
        
        
Answer:
Miles per hour  and
Kilometres per second.
Step-by-step explanation:
 
        
                    
             
        
        
        
Let's assume that Kirby walks with a speed 

for a time 

, and that he runs with a speed

for a time 

.
The total time available for Kirby to catch the train is:

and this must be equal to the sum of the two times t1 and t2:
 
 The distance Kirby should cover is

and this should be equal to the sum of the distances covered by walking and by running:

So we have a system of 2 equations:


If we solve the system, we find:


So, Kirby needs to run at least for 8 minutes in order to catch the train.
 
        
        
        
Answer:
G
Step-by-step explanation: