You are suppose to subtract making it
X+7=13
 -7=-7
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X=6
        
             
        
        
        
If the radius is 5 ft, the circumference is 10 pi or about 31.4 
1000 divided by 31.4 = 31.8 
So, it should make a minimum of 32 revolutions to reach 1000 feet. 
        
                    
             
        
        
        
Percent of decrease :
Original - New / Original
so...
80 - 52 / 80 ---->
28/80
.35 multiply by 100 to get percent
35% increase Hope I helped if you have any questions let me know! :)
        
             
        
        
        
Answer:
10y^2-3xy+6x
Step-by-step explanation: