Answer:
28 degrees
Step-by-step explanation:
A triangle is 180 degrees. 180-152=28.
 
        
                    
             
        
        
        
 Answer: 20790
Step-by-step explanation:
 
        
             
        
        
        
So car A travels Distance = 60 km/hr*(1+x)
Car B travels Distance = 75 km/hr(x)
Where x is the time in hours.
Those two equations are equal when on overtakes the other
so:
60 +60x = 75x
60=15x
x=4, but my expression is written to count from when car B commenced travel. So total time is 5 hours from the car A setting off. 
 
        
                    
             
        
        
        
I think this is more of an opinion question. What someone could solve mentally may not be the same as someone else's.If it were my worksheet, I'd circle all of them but it may be different for you.
At your level, I'd probably circle:
54 - 10
93 - 20
and 39 - 2
        
             
        
        
        
Answer:
good question
Step-by-step explanation: