Answer:
b
Step-by-step explanation:
its correct
 
        
                    
             
        
        
        
Step-by-step explanation:
-10 or -20 satisfies the equation.
But when you substitute 10 in:
30-40<-50+8
-10<-42(wrong)
it's wrong
 
        
             
        
        
        
13. five plus <em>y</em> equal to negative two. y = -7
14. eight plus <em>h</em> equal to twelve. h = 4
15. negative thirteen plus four equal <em>n</em>. n = -9
 
        
             
        
        
        
It will be around 1.6metres 
hope it helps