Answer:
12+2x
Step-by-step explanation:
2(10)+2(x-4)
20+2x-8
12+2x
 
        
             
        
        
        
D=rt and we are told d=546 and r=1.3m/s so
1.3t=546  divide both sides by 1.3
t=420 seconds so
420s(min/60s)=7 min
So it takes him 7 minutes to walk to Sara's house.
        
             
        
        
        
5  infinitely many 
6. none
        
             
        
        
        
Step-by-step explanation:
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