Answer:
75
Step-by-step explanation:
 
        
             
        
        
        
Answer:
The Y intercept is -5 and the slope is -5/2
 
        
             
        
        
        
Answer:
21:50
Step-by-step explanation:
We need to find the ratio of 420 m to 1 km.
We know that,
1 km = 1000 m
So,
The ratio becomes,

So, the required ratio is 21:50.